ECMAScript 6 capability of PhantomJS 2.1.1

create.js

// PhantomJS script for creating this data

var page = require('webpage').create();
var fs = require('fs');

var url = "https://kangax.github.io/compat-table/es6/";

page.onConsoleMessage = function(msg, lineNum, sourceId) {
    console.log('CONSOLE> ' + msg);
};

page.open(url, function(status) {
	setTimeout(function(){
		var result = page.evaluate(function(){
			var data = {};
			var forEach = Array.prototype.forEach;

			var tw = document.getElementById('table-wrapper');
			forEach.call(tw.querySelectorAll('tr:not(.size-row):not(.subtest):not(.category)'), function (st) {
			  var key = st.querySelector('td:first-child span > a:not(.anchor)').textContent.trim();
			  data[key] = {
				overall: st.children[1].textContent.trim()
			  };
			  var next = st.nextElementSibling;
			  var keyNext;
			  while (next && next.className.indexOf("subtest") !== -1) {
				if (!data[key].sub) {
				  data[key].sub = {};
				}
				keyNext = next.querySelector('td:first-child span').textContent.replace("§", "").trim();
				data[key].sub[keyNext] = next.children[1].textContent.trim();
				next = next.nextElementSibling;
			  }
			});

			return {
				overall: document.querySelector(".current .num-features").textContent.trim(),
				details: data
			};
		});
		
		var lessDetail = "Overall coverage: " + result.overall;
		var fullDetail = lessDetail;
		for(var name in result.details) {
			if (result.details.hasOwnProperty(name)) {
				var row = "\n> " + name + ": " + result.details[name].overall;
				lessDetail += row;
				fullDetail += row;
				if (result.details[name].sub) {
					for(var subName in result.details[name].sub) {
						if (result.details[name].sub.hasOwnProperty(subName)) {
							fullDetail += "\n    > " + subName + ": " + result.details[name].sub[subName];
						}
					}
				}
			}
		}
		
		page.render("screenshot.png");
		fs.write("full_details.json", JSON.stringify(result, undefined, 4));
		fs.write("less_details.txt", lessDetail);
		fs.write("full_details.txt", fullDetail);
		phantom.exit();
	}, 5000);
});

full_details.json

{
    "details": {
        "Array is subclassable": {
            "overall": "0/11",
            "sub": {
                "Array.from": "No",
                "Array.isArray support": "No",
                "Array.of": "No",
                "Array.prototype.concat": "No",
                "Array.prototype.filter": "No",
                "Array.prototype.map": "No",
                "Array.prototype.slice": "No",
                "Array.prototype.splice": "No",
                "correct prototype chain": "No",
                "length property (accessing)": "No",
                "length property (setting)": "No"
            }
        },
        "Array static methods": {
            "overall": "0/11",
            "sub": {
                "Array.from map function, array-like objects": "No",
                "Array.from map function, generator instances": "No",
                "Array.from map function, generic iterables": "No",
                "Array.from map function, instances of iterables": "No",
                "Array.from, array-like objects": "No",
                "Array.from, generator instances": "No",
                "Array.from, generic iterables": "No",
                "Array.from, instances of generic iterables": "No",
                "Array.from, iterator closing": "No",
                "Array.of": "No",
                "Array[Symbol.species]": "No"
            }
        },
        "Array.prototype methods": {
            "overall": "0/10",
            "sub": {
                "Array iterator prototype chain": "No",
                "Array.prototype.copyWithin": "No",
                "Array.prototype.entries": "No",
                "Array.prototype.fill": "No",
                "Array.prototype.find": "No",
                "Array.prototype.findIndex": "No",
                "Array.prototype.keys": "No",
                "Array.prototype.values": "No",
                "Array.prototype[Symbol.iterator]": "No",
                "Array.prototype[Symbol.unscopables]": "No"
            }
        },
        "Date.prototype[Symbol.toPrimitive]": {
            "overall": "No"
        },
        "Function is subclassable": {
            "overall": "0/6",
            "sub": {
                "Function.prototype.apply": "No",
                "Function.prototype.bind": "No",
                "Function.prototype.call": "No",
                "can be called": "No",
                "can be used with \"new\"": "No",
                "correct prototype chain": "No"
            }
        },
        "HTML-style comments": {
            "overall": "Yes"
        },
        "Map": {
            "overall": "0/19",
            "sub": {
                "-0 key converts to +0": "No",
                "Map iterator prototype chain": "No",
                "Map.prototype isn't an instance": "No",
                "Map.prototype.clear": "No",
                "Map.prototype.delete": "No",
                "Map.prototype.entries": "No",
                "Map.prototype.forEach": "No",
                "Map.prototype.keys": "No",
                "Map.prototype.set returns this": "No",
                "Map.prototype.size": "No",
                "Map.prototype.values": "No",
                "Map.prototype[Symbol.iterator]": "No",
                "Map[Symbol.species]": "No",
                "basic functionality": "No",
                "constructor accepts null": "No",
                "constructor arguments": "No",
                "constructor invokes set": "No",
                "constructor requires new": "No",
                "iterator closing": "No"
            }
        },
        "Math methods": {
            "overall": "1/17",
            "sub": {
                "Math.acosh": "No",
                "Math.asinh": "No",
                "Math.atanh": "No",
                "Math.cbrt": "No",
                "Math.clz32": "No",
                "Math.cosh": "No",
                "Math.expm1": "No",
                "Math.fround": "No",
                "Math.hypot": "No",
                "Math.imul": "Yes",
                "Math.log10": "No",
                "Math.log1p": "No",
                "Math.log2": "No",
                "Math.sign": "No",
                "Math.sinh": "No",
                "Math.tanh": "No",
                "Math.trunc": "No"
            }
        },
        "Number properties": {
            "overall": "0/7",
            "sub": {
                "Number.EPSILON": "No",
                "Number.MAX_SAFE_INTEGER": "No",
                "Number.MIN_SAFE_INTEGER": "No",
                "Number.isFinite": "No",
                "Number.isInteger": "No",
                "Number.isNaN": "No",
                "Number.isSafeInteger": "No"
            }
        },
        "Object static methods": {
            "overall": "0/4",
            "sub": {
                "Object.assign": "No",
                "Object.getOwnPropertySymbols": "No",
                "Object.is": "No",
                "Object.setPrototypeOf": "No"
            }
        },
        "Object static methods accept primitives": {
            "overall": "0/10",
            "sub": {
                "Object.freeze": "No",
                "Object.getOwnPropertyDescriptor": "No",
                "Object.getOwnPropertyNames": "No",
                "Object.getPrototypeOf": "No",
                "Object.isExtensible": "No",
                "Object.isFrozen": "No",
                "Object.isSealed": "No",
                "Object.keys": "No",
                "Object.preventExtensions": "No",
                "Object.seal": "No"
            }
        },
        "Object.prototype.__proto__": {
            "overall": "6/6",
            "sub": {
                "absent from Object.create(null)": "Yes",
                "correct property descriptor": "Yes",
                "get prototype": "Yes",
                "present in Object.getOwnPropertyNames()": "Yes",
                "present in hasOwnProperty()": "Yes",
                "set prototype": "Yes"
            }
        },
        "Promise": {
            "overall": "0/8",
            "sub": {
                "Promise.all": "No",
                "Promise.all, generic iterables": "No",
                "Promise.prototype isn't an instance": "No",
                "Promise.race": "No",
                "Promise.race, generic iterables": "No",
                "Promise[Symbol.species]": "No",
                "basic functionality": "No",
                "constructor requires new": "No"
            }
        },
        "Promise is subclassable": {
            "overall": "0/4",
            "sub": {
                "Promise.all": "No",
                "Promise.race": "No",
                "basic functionality": "No",
                "correct prototype chain": "No"
            }
        },
        "Proxy": {
            "overall": "0/34",
            "sub": {
                "\"apply\" handler": "No",
                "\"apply\" handler invariant": "No",
                "\"construct\" handler": "No",
                "\"construct\" handler invariants": "No",
                "\"defineProperty\" handler": "No",
                "\"defineProperty\" handler invariants": "No",
                "\"deleteProperty\" handler": "No",
                "\"deleteProperty\" handler invariant": "No",
                "\"get\" handler": "No",
                "\"get\" handler invariants": "No",
                "\"get\" handler, instances of proxies": "No",
                "\"getOwnPropertyDescriptor\" handler": "No",
                "\"getOwnPropertyDescriptor\" handler invariants": "No",
                "\"getPrototypeOf\" handler": "No",
                "\"getPrototypeOf\" handler invariant": "No",
                "\"has\" handler": "No",
                "\"has\" handler invariants": "No",
                "\"has\" handler, instances of proxies": "No",
                "\"isExtensible\" handler": "No",
                "\"isExtensible\" handler invariant": "No",
                "\"ownKeys\" handler": "No",
                "\"ownKeys\" handler invariant": "No",
                "\"preventExtensions\" handler": "No",
                "\"preventExtensions\" handler invariant": "No",
                "\"set\" handler": "No",
                "\"set\" handler invariants": "No",
                "\"set\" handler, instances of proxies": "No",
                "\"setPrototypeOf\" handler": "No",
                "\"setPrototypeOf\" handler invariant": "No",
                "Array.isArray support": "No",
                "JSON.stringify support": "No",
                "Proxy.revocable": "No",
                "constructor requires new": "No",
                "no \"prototype\" property": "No"
            }
        },
        "Proxy, internal 'defineProperty' calls": {
            "overall": "0/2",
            "sub": {
                "SetIntegrityLevel": "No",
                "[[Set]]": "No"
            }
        },
        "Proxy, internal 'deleteProperty' calls": {
            "overall": "0/6",
            "sub": {
                "Array.prototype.copyWithin": "No",
                "Array.prototype.pop": "No",
                "Array.prototype.reverse": "No",
                "Array.prototype.shift": "No",
                "Array.prototype.splice": "No",
                "Array.prototype.unshift": "No"
            }
        },
        "Proxy, internal 'get' calls": {
            "overall": "0/36",
            "sub": {
                "Array.from": "No",
                "Array.prototype iteration methods": "No",
                "Array.prototype.concat": "No",
                "Array.prototype.pop": "No",
                "Array.prototype.reverse": "No",
                "Array.prototype.shift": "No",
                "Array.prototype.splice": "No",
                "Array.prototype.toString": "No",
                "ClassDefinitionEvaluation": "No",
                "CreateDynamicFunction": "No",
                "CreateListFromArrayLike": "No",
                "Date.prototype.toJSON": "No",
                "Error.prototype.toString": "No",
                "Function.prototype.bind": "No",
                "HasBinding": "No",
                "IteratorComplete, IteratorValue": "No",
                "JSON.stringify": "No",
                "Object.assign": "No",
                "Object.defineProperties": "No",
                "Promise resolve functions": "No",
                "RegExp constructor": "No",
                "RegExp.prototype.flags": "No",
                "RegExp.prototype.test": "No",
                "RegExp.prototype.toString": "No",
                "RegExp.prototype[Symbol.match]": "No",
                "RegExp.prototype[Symbol.replace]": "No",
                "RegExp.prototype[Symbol.search]": "No",
                "RegExp.prototype[Symbol.split]": "No",
                "String.prototype.match": "No",
                "String.prototype.replace": "No",
                "String.prototype.search": "No",
                "String.prototype.split": "No",
                "String.raw": "No",
                "ToPrimitive": "No",
                "ToPropertyDescriptor": "No",
                "instanceof operator": "No"
            }
        },
        "Proxy, internal 'getOwnPropertyDescriptor' calls": {
            "overall": "0/4",
            "sub": {
                "Function.prototype.bind": "No",
                "Object.assign": "No",
                "Object.prototype.hasOwnProperty": "No",
                "[[Set]]": "No"
            }
        },
        "Proxy, internal 'ownKeys' calls": {
            "overall": "0/3",
            "sub": {
                "SerializeJSONObject": "No",
                "SetIntegrityLevel": "No",
                "TestIntegrityLevel": "No"
            }
        },
        "Proxy, internal 'set' calls": {
            "overall": "0/11",
            "sub": {
                "Array.from": "No",
                "Array.of": "No",
                "Array.prototype.copyWithin": "No",
                "Array.prototype.fill": "No",
                "Array.prototype.pop": "No",
                "Array.prototype.push": "No",
                "Array.prototype.reverse": "No",
                "Array.prototype.shift": "No",
                "Array.prototype.splice": "No",
                "Array.prototype.unshift": "No",
                "Object.assign": "No"
            }
        },
        "Reflect": {
            "overall": "0/20",
            "sub": {
                "Reflect.apply": "No",
                "Reflect.construct": "No",
                "Reflect.construct creates instances from third argument": "No",
                "Reflect.construct sets new.target meta-property": "No",
                "Reflect.construct, Array subclassing": "No",
                "Reflect.construct, Function subclassing": "No",
                "Reflect.construct, Promise subclassing": "No",
                "Reflect.construct, RegExp subclassing": "No",
                "Reflect.defineProperty": "No",
                "Reflect.deleteProperty": "No",
                "Reflect.get": "No",
                "Reflect.getOwnPropertyDescriptor": "No",
                "Reflect.getPrototypeOf": "No",
                "Reflect.has": "No",
                "Reflect.isExtensible": "No",
                "Reflect.ownKeys, string keys": "No",
                "Reflect.ownKeys, symbol keys": "No",
                "Reflect.preventExtensions": "No",
                "Reflect.set": "No",
                "Reflect.setPrototypeOf": "No"
            }
        },
        "RegExp \"y\" and \"u\" flags": {
            "overall": "0/5",
            "sub": {
                "\"u\" flag": "No",
                "\"u\" flag, Unicode code point escapes": "No",
                "\"u\" flag, case folding": "No",
                "\"y\" flag": "No",
                "\"y\" flag, lastIndex": "No"
            }
        },
        "RegExp is subclassable": {
            "overall": "0/4",
            "sub": {
                "RegExp.prototype.exec": "No",
                "RegExp.prototype.test": "No",
                "basic functionality": "No",
                "correct prototype chain": "No"
            }
        },
        "RegExp syntax extensions": {
            "overall": "8/8",
            "sub": {
                "hyphens in character sets": "Yes",
                "incomplete patterns and quantifiers": "Yes",
                "invalid Unicode escapes": "Yes",
                "invalid backreferences become octal escapes": "Yes",
                "invalid character escapes": "Yes",
                "invalid control-character escapes": "Yes",
                "invalid hexadecimal escapes": "Yes",
                "octal escape sequences": "Yes"
            }
        },
        "RegExp.prototype properties": {
            "overall": "0/6",
            "sub": {
                "RegExp.prototype.flags": "No",
                "RegExp.prototype[Symbol.match]": "No",
                "RegExp.prototype[Symbol.replace]": "No",
                "RegExp.prototype[Symbol.search]": "No",
                "RegExp.prototype[Symbol.split]": "No",
                "RegExp[Symbol.species]": "No"
            }
        },
        "RegExp.prototype.compile": {
            "overall": "Yes"
        },
        "Set": {
            "overall": "0/19",
            "sub": {
                "-0 key converts to +0": "No",
                "Set iterator prototype chain": "No",
                "Set.prototype isn't an instance": "No",
                "Set.prototype.add returns this": "No",
                "Set.prototype.clear": "No",
                "Set.prototype.delete": "No",
                "Set.prototype.entries": "No",
                "Set.prototype.forEach": "No",
                "Set.prototype.keys": "No",
                "Set.prototype.size": "No",
                "Set.prototype.values": "No",
                "Set.prototype[Symbol.iterator]": "No",
                "Set[Symbol.species]": "No",
                "basic functionality": "No",
                "constructor accepts null": "No",
                "constructor arguments": "No",
                "constructor invokes add": "No",
                "constructor requires new": "No",
                "iterator closing": "No"
            }
        },
        "String static methods": {
            "overall": "0/2",
            "sub": {
                "String.fromCodePoint": "No",
                "String.raw": "No"
            }
        },
        "String.prototype HTML methods": {
            "overall": "3/3",
            "sub": {
                "existence": "Yes",
                "quotes in arguments are escaped": "Yes",
                "tags' names are lowercase": "Yes"
            }
        },
        "String.prototype methods": {
            "overall": "0/10",
            "sub": {
                "String iterator prototype chain": "No",
                "String.prototype.codePointAt": "No",
                "String.prototype.endsWith": "No",
                "String.prototype.endsWith throws on RegExp": "No",
                "String.prototype.includes": "No",
                "String.prototype.normalize": "No",
                "String.prototype.repeat": "No",
                "String.prototype.startsWith": "No",
                "String.prototype.startsWith throws on RegExp": "No",
                "String.prototype[Symbol.iterator]": "No"
            }
        },
        "Symbol": {
            "overall": "0/11",
            "sub": {
                "JSON.stringify ignores symbols": "No",
                "Object(symbol)": "No",
                "Object.defineProperty support": "No",
                "basic functionality": "No",
                "can convert with String()": "No",
                "cannot coerce to string or number": "No",
                "global symbol registry": "No",
                "new Symbol() throws": "No",
                "symbol keys are hidden to pre-ES6 code": "No",
                "symbols inherit from Symbol.prototype": "No",
                "typeof support": "No"
            }
        },
        "Unicode code point escapes": {
            "overall": "0/2",
            "sub": {
                "in identifiers": "No",
                "in strings": "No"
            }
        },
        "WeakMap": {
            "overall": "0/12",
            "sub": {
                ".has, .get and .delete methods accept primitives": "No",
                "WeakMap.prototype isn't an instance": "No",
                "WeakMap.prototype.delete": "No",
                "WeakMap.prototype.set returns this": "No",
                "basic functionality": "No",
                "constructor accepts null": "No",
                "constructor arguments": "No",
                "constructor invokes set": "No",
                "constructor requires new": "No",
                "frozen objects as keys": "No",
                "iterator closing": "No",
                "no WeakMap.prototype.clear method": "No"
            }
        },
        "WeakSet": {
            "overall": "0/11",
            "sub": {
                ".has and .delete methods accept primitives": "No",
                "WeakSet.prototype isn't an instance": "No",
                "WeakSet.prototype.add returns this": "No",
                "WeakSet.prototype.delete": "No",
                "basic functionality": "No",
                "constructor accepts null": "No",
                "constructor arguments": "No",
                "constructor invokes add": "No",
                "constructor requires new": "No",
                "iterator closing": "No",
                "no WeakSet.prototype.clear method": "No"
            }
        },
        "__proto__ in object literals": {
            "overall": "1/5",
            "sub": {
                "basic support": "Yes",
                "multiple __proto__ is an error": "No",
                "not a computed property": "No",
                "not a shorthand method": "No",
                "not a shorthand property": "No"
            }
        },
        "arrow functions": {
            "overall": "0/13",
            "sub": {
                "\"this\" unchanged by call or apply": "No",
                "0 parameters": "No",
                "1 parameter, no brackets": "No",
                "can't be bound, can be curried": "No",
                "correct precedence": "No",
                "lexical \"arguments\" binding": "No",
                "lexical \"new.target\" binding": "No",
                "lexical \"super\" binding in constructors": "No",
                "lexical \"super\" binding in methods": "No",
                "lexical \"this\" binding": "No",
                "multiple parameters": "No",
                "no \"prototype\" property": "No",
                "no line break between params and =>": "No"
            }
        },
        "block-level function declaration": {
            "overall": "No"
        },
        "class": {
            "overall": "0/24",
            "sub": {
                "accessor properties": "No",
                "anonymous class": "No",
                "class expression": "No",
                "class name is lexically scoped": "No",
                "class statement": "No",
                "computed accessor properties": "No",
                "computed names, temporal dead zone": "No",
                "computed prototype methods": "No",
                "computed static accessor properties": "No",
                "computed static methods": "No",
                "constructor": "No",
                "constructor requires new": "No",
                "extends": "No",
                "extends expressions": "No",
                "extends null": "No",
                "implicit strict mode": "No",
                "is block-scoped": "No",
                "methods aren't enumerable": "No",
                "new.target": "No",
                "optional semicolons": "No",
                "prototype methods": "No",
                "static accessor properties": "No",
                "static methods": "No",
                "string-keyed methods": "No"
            }
        },
        "const": {
            "overall": "1/16",
            "sub": {
                "basic support": "Yes",
                "basic support (strict mode)": "No",
                "cannot be in statements": "No",
                "cannot be in statements (strict mode)": "No",
                "for loop statement scope": "No",
                "for loop statement scope (strict mode)": "No",
                "for-in loop iteration scope": "No",
                "for-in loop iteration scope (strict mode)": "No",
                "for-of loop iteration scope": "No",
                "for-of loop iteration scope (strict mode)": "No",
                "is block-scoped": "No",
                "is block-scoped (strict mode)": "No",
                "redefining a const (strict mode)": "No",
                "redefining a const is an error": "No",
                "temporal dead zone": "No",
                "temporal dead zone (strict mode)": "No"
            }
        },
        "default function parameters": {
            "overall": "0/7",
            "sub": {
                "arguments object interaction": "No",
                "basic functionality": "No",
                "defaults can refer to previous params": "No",
                "explicit undefined defers to the default": "No",
                "new Function() support": "No",
                "separate scope": "No",
                "temporal dead zone": "No"
            }
        },
        "destructuring, assignment": {
            "overall": "0/24",
            "sub": {
                "chained iterable destructuring": "No",
                "chained object destructuring": "No",
                "computed properties": "No",
                "defaults": "No",
                "empty patterns": "No",
                "iterable destructuring expression": "No",
                "iterator closing": "No",
                "nested": "No",
                "nested rest": "No",
                "object destructuring expression": "No",
                "object destructuring with primitives": "No",
                "parenthesised left-hand-side is a syntax error": "No",
                "rest": "No",
                "throws on null and undefined": "No",
                "trailing commas in iterable patterns": "No",
                "trailing commas in object patterns": "No",
                "with arrays": "No",
                "with astral plane strings": "No",
                "with generator instances": "No",
                "with generic iterables": "No",
                "with instances of generic iterables": "No",
                "with objects": "No",
                "with sparse arrays": "No",
                "with strings": "No"
            }
        },
        "destructuring, declarations": {
            "overall": "0/22",
            "sub": {
                "computed properties": "No",
                "defaults": "No",
                "defaults, let temporal dead zone": "No",
                "in catch heads": "No",
                "in for-in loop heads": "No",
                "in for-of loop heads": "No",
                "iterator closing": "No",
                "multiples in a single var statement": "No",
                "nested": "No",
                "object destructuring with primitives": "No",
                "rest": "No",
                "throws on null and undefined": "No",
                "trailing commas in iterable patterns": "No",
                "trailing commas in object patterns": "No",
                "with arrays": "No",
                "with astral plane strings": "No",
                "with generator instances": "No",
                "with generic iterables": "No",
                "with instances of generic iterables": "No",
                "with objects": "No",
                "with sparse arrays": "No",
                "with strings": "No"
            }
        },
        "destructuring, parameters": {
            "overall": "0/23",
            "sub": {
                "'arguments' interaction": "No",
                "computed properties": "No",
                "defaults": "No",
                "defaults, new Function() support": "No",
                "defaults, separate scope": "No",
                "empty patterns": "No",
                "in parameters, function 'length' property": "No",
                "iterator closing": "No",
                "nested": "No",
                "new Function() support": "No",
                "object destructuring with primitives": "No",
                "rest": "No",
                "throws on null and undefined": "No",
                "trailing commas in iterable patterns": "No",
                "trailing commas in object patterns": "No",
                "with arrays": "No",
                "with astral plane strings": "No",
                "with generator instances": "No",
                "with generic iterables": "No",
                "with instances of generic iterables": "No",
                "with objects": "No",
                "with sparse arrays": "No",
                "with strings": "No"
            }
        },
        "for..of loops": {
            "overall": "0/9",
            "sub": {
                "iterator closing, break": "No",
                "iterator closing, throw": "No",
                "with arrays": "No",
                "with astral plane strings": "No",
                "with generator instances": "No",
                "with generic iterables": "No",
                "with instances of generic iterables": "No",
                "with sparse arrays": "No",
                "with strings": "No"
            }
        },
        "function \"name\" property": {
            "overall": "3/17",
            "sub": {
                "accessor properties": "No",
                "bound functions": "No",
                "class expressions": "No",
                "class prototype methods": "No",
                "class statements": "No",
                "class static methods": "No",
                "function expressions": "Yes",
                "function statements": "Yes",
                "isn't writable, is configurable": "No",
                "new Function": "Yes",
                "object methods (class)": "No",
                "object methods (function)": "No",
                "shorthand methods": "No",
                "shorthand methods (no lexical binding)": "No",
                "symbol-keyed methods": "No",
                "variables (class)": "No",
                "variables (function)": "No"
            }
        },
        "generators": {
            "overall": "0/27",
            "sub": {
                "%GeneratorPrototype%": "No",
                "%GeneratorPrototype% prototype chain": "No",
                "%GeneratorPrototype%.constructor": "No",
                "%GeneratorPrototype%.return": "No",
                "%GeneratorPrototype%.throw": "No",
                "basic functionality": "No",
                "can't use \"this\" with new": "No",
                "computed shorthand generators": "No",
                "computed shorthand generators, classes": "No",
                "correct \"this\" binding": "No",
                "generator function expressions": "No",
                "sending": "No",
                "shorthand generator methods": "No",
                "shorthand generator methods, classes": "No",
                "shorthand generators can't be constructors": "No",
                "string-keyed shorthand generator methods": "No",
                "yield * on non-iterables is a runtime error": "No",
                "yield *, arrays": "No",
                "yield *, astral plane strings": "No",
                "yield *, generator instances": "No",
                "yield *, generic iterables": "No",
                "yield *, instances of iterables": "No",
                "yield *, iterator closing": "No",
                "yield *, iterator closing via throw()": "No",
                "yield *, sparse arrays": "No",
                "yield *, strings": "No",
                "yield operator precedence": "No"
            }
        },
        "let": {
            "overall": "0/12",
            "sub": {
                "basic support": "No",
                "basic support (strict mode)": "No",
                "cannot be in statements": "No",
                "cannot be in statements (strict mode)": "No",
                "for loop statement scope": "No",
                "for loop statement scope (strict mode)": "No",
                "for/for-in loop iteration scope": "No",
                "for/for-in loop iteration scope (strict mode)": "No",
                "is block-scoped": "No",
                "is block-scoped (strict mode)": "No",
                "temporal dead zone": "No",
                "temporal dead zone (strict mode)": "No"
            }
        },
        "miscellaneous": {
            "overall": "2/10",
            "sub": {
                "Invalid Date": "Yes",
                "RegExp constructor can alter flags": "No",
                "RegExp.prototype.toString generic and uses \"flags\" property": "No",
                "accessors aren't constructors": "No",
                "built-in prototypes are not instances": "No",
                "duplicate property names in strict mode": "No",
                "function 'length' is configurable": "No",
                "no assignments allowed in for-in head": "No",
                "no escaped reserved words as identifiers": "No",
                "no semicolon needed after do-while": "Yes"
            }
        },
        "miscellaneous subclassables": {
            "overall": "0/6",
            "sub": {
                "Boolean is subclassable": "No",
                "Error is subclassable": "No",
                "Map is subclassable": "No",
                "Number is subclassable": "No",
                "Set is subclassable": "No",
                "String is subclassable": "No"
            }
        },
        "new.target": {
            "overall": "0/2",
            "sub": {
                "assignment is an early error": "No",
                "in constructors": "No"
            }
        },
        "non-strict function semantics": {
            "overall": "2/3",
            "sub": {
                "function statements in if-statement clauses": "Yes",
                "hoisted block-level function declaration": "No",
                "labeled function statements": "Yes"
            }
        },
        "object literal extensions": {
            "overall": "0/6",
            "sub": {
                "computed accessors": "No",
                "computed properties": "No",
                "computed shorthand methods": "No",
                "shorthand methods": "No",
                "shorthand properties": "No",
                "string-keyed shorthand methods": "No"
            }
        },
        "octal and binary literals": {
            "overall": "0/4",
            "sub": {
                "binary literals": "No",
                "binary supported by Number()": "No",
                "octal literals": "No",
                "octal supported by Number()": "No"
            }
        },
        "own property order": {
            "overall": "4/7",
            "sub": {
                "JSON.parse": "Yes",
                "JSON.stringify": "Yes",
                "Object.assign": "No",
                "Object.getOwnPropertyNames": "Yes",
                "Object.keys": "Yes",
                "Reflect.ownKeys, string key order": "No",
                "Reflect.ownKeys, symbol key order": "No"
            }
        },
        "proper tail calls (tail call optimisation)": {
            "overall": "0/2",
            "sub": {
                "direct recursion": "No",
                "mutual recursion": "No"
            }
        },
        "prototype of bound functions": {
            "overall": "0/5",
            "sub": {
                "arrow functions": "No",
                "basic functions": "No",
                "classes": "No",
                "generator functions": "No",
                "subclasses": "No"
            }
        },
        "rest parameters": {
            "overall": "0/5",
            "sub": {
                "arguments object interaction": "No",
                "basic functionality": "No",
                "can't be used in setters": "No",
                "function 'length' property": "No",
                "new Function() support": "No"
            }
        },
        "spread (...) operator": {
            "overall": "0/15",
            "sub": {
                "spreading non-iterables is a runtime error": "No",
                "with arrays, in array literals": "No",
                "with arrays, in function calls": "No",
                "with astral plane strings, in array literals": "No",
                "with astral plane strings, in function calls": "No",
                "with generator instances, in arrays": "No",
                "with generator instances, in calls": "No",
                "with generic iterables, in arrays": "No",
                "with generic iterables, in calls": "No",
                "with instances of iterables, in arrays": "No",
                "with instances of iterables, in calls": "No",
                "with sparse arrays, in array literals": "No",
                "with sparse arrays, in function calls": "No",
                "with strings, in array literals": "No",
                "with strings, in function calls": "No"
            }
        },
        "super": {
            "overall": "0/8",
            "sub": {
                "constructor calls use correct \"new.target\" binding": "No",
                "expression in constructors": "No",
                "in methods, method calls": "No",
                "in methods, property access": "No",
                "is statically bound": "No",
                "method calls use correct \"this\" binding": "No",
                "statement in constructors": "No",
                "super() invokes the correct constructor": "No"
            }
        },
        "template literals": {
            "overall": "0/5",
            "sub": {
                "basic functionality": "No",
                "line break normalisation": "No",
                "passed array is frozen": "No",
                "tagged template literals": "No",
                "toString conversion": "No"
            }
        },
        "typed arrays": {
            "overall": "19/46",
            "sub": {
                "%TypedArray%.from": "No",
                "%TypedArray%.of": "No",
                "%TypedArray%.prototype.copyWithin": "No",
                "%TypedArray%.prototype.entries": "No",
                "%TypedArray%.prototype.every": "No",
                "%TypedArray%.prototype.fill": "No",
                "%TypedArray%.prototype.filter": "No",
                "%TypedArray%.prototype.find": "No",
                "%TypedArray%.prototype.findIndex": "No",
                "%TypedArray%.prototype.forEach": "No",
                "%TypedArray%.prototype.indexOf": "No",
                "%TypedArray%.prototype.join": "No",
                "%TypedArray%.prototype.keys": "No",
                "%TypedArray%.prototype.lastIndexOf": "No",
                "%TypedArray%.prototype.map": "No",
                "%TypedArray%.prototype.reduce": "No",
                "%TypedArray%.prototype.reduceRight": "No",
                "%TypedArray%.prototype.reverse": "No",
                "%TypedArray%.prototype.slice": "No",
                "%TypedArray%.prototype.some": "No",
                "%TypedArray%.prototype.sort": "No",
                "%TypedArray%.prototype.subarray": "Yes",
                "%TypedArray%.prototype.values": "No",
                "%TypedArray%.prototype[Symbol.iterator]": "No",
                "%TypedArray%[Symbol.species]": "No",
                "ArrayBuffer[Symbol.species]": "No",
                "DataView (Float32)": "Yes",
                "DataView (Float64)": "Yes",
                "DataView (Int16)": "Yes",
                "DataView (Int32)": "Yes",
                "DataView (Int8)": "Yes",
                "DataView (Uint16)": "Yes",
                "DataView (Uint32)": "Yes",
                "DataView (Uint8)": "Yes",
                "Float32Array": "Yes",
                "Float64Array": "Yes",
                "Int16Array": "Yes",
                "Int32Array": "Yes",
                "Int8Array": "Yes",
                "Uint16Array": "Yes",
                "Uint32Array": "Yes",
                "Uint8Array": "Yes",
                "Uint8ClampedArray": "Yes",
                "constructors accept generic iterables": "No",
                "constructors require new": "Yes",
                "correct prototype chains": "No"
            }
        },
        "well-known symbols": {
            "overall": "0/26",
            "sub": {
                "Symbol.hasInstance": "No",
                "Symbol.isConcatSpreadable": "No",
                "Symbol.iterator, arguments object": "No",
                "Symbol.iterator, existence": "No",
                "Symbol.match": "No",
                "Symbol.match, RegExp constructor": "No",
                "Symbol.match, String.prototype.endsWith": "No",
                "Symbol.match, String.prototype.includes": "No",
                "Symbol.match, String.prototype.startsWith": "No",
                "Symbol.replace": "No",
                "Symbol.search": "No",
                "Symbol.species, Array.prototype.concat": "No",
                "Symbol.species, Array.prototype.filter": "No",
                "Symbol.species, Array.prototype.map": "No",
                "Symbol.species, Array.prototype.slice": "No",
                "Symbol.species, Array.prototype.splice": "No",
                "Symbol.species, Promise.prototype.then": "No",
                "Symbol.species, RegExp.prototype[Symbol.split]": "No",
                "Symbol.species, existence": "No",
                "Symbol.split": "No",
                "Symbol.toPrimitive": "No",
                "Symbol.toStringTag": "No",
                "Symbol.toStringTag affects existing built-ins": "No",
                "Symbol.toStringTag, misc. built-ins": "No",
                "Symbol.toStringTag, new built-ins": "No",
                "Symbol.unscopables": "No"
            }
        }
    },
    "overall": "10%"
}

full_details.txt

Overall coverage: 10%
> Array is subclassable: 0/11
    > Array.from: No
    > Array.isArray support: No
    > Array.of: No
    > Array.prototype.concat: No
    > Array.prototype.filter: No
    > Array.prototype.map: No
    > Array.prototype.slice: No
    > Array.prototype.splice: No
    > correct prototype chain: No
    > length property (accessing): No
    > length property (setting): No
> Array static methods: 0/11
    > Array.from map function, array-like objects: No
    > Array.from map function, generator instances: No
    > Array.from map function, generic iterables: No
    > Array.from map function, instances of iterables: No
    > Array.from, array-like objects: No
    > Array.from, generator instances: No
    > Array.from, generic iterables: No
    > Array.from, instances of generic iterables: No
    > Array.from, iterator closing: No
    > Array.of: No
    > Array[Symbol.species]: No
> Array.prototype methods: 0/10
    > Array iterator prototype chain: No
    > Array.prototype.copyWithin: No
    > Array.prototype.entries: No
    > Array.prototype.fill: No
    > Array.prototype.find: No
    > Array.prototype.findIndex: No
    > Array.prototype.keys: No
    > Array.prototype.values: No
    > Array.prototype[Symbol.iterator]: No
    > Array.prototype[Symbol.unscopables]: No
> Date.prototype[Symbol.toPrimitive]: No
> Function is subclassable: 0/6
    > Function.prototype.apply: No
    > Function.prototype.bind: No
    > Function.prototype.call: No
    > can be called: No
    > can be used with "new": No
    > correct prototype chain: No
> HTML-style comments: Yes
> Map: 0/19
    > -0 key converts to +0: No
    > Map iterator prototype chain: No
    > Map.prototype isn't an instance: No
    > Map.prototype.clear: No
    > Map.prototype.delete: No
    > Map.prototype.entries: No
    > Map.prototype.forEach: No
    > Map.prototype.keys: No
    > Map.prototype.set returns this: No
    > Map.prototype.size: No
    > Map.prototype.values: No
    > Map.prototype[Symbol.iterator]: No
    > Map[Symbol.species]: No
    > basic functionality: No
    > constructor accepts null: No
    > constructor arguments: No
    > constructor invokes set: No
    > constructor requires new: No
    > iterator closing: No
> Math methods: 1/17
    > Math.acosh: No
    > Math.asinh: No
    > Math.atanh: No
    > Math.cbrt: No
    > Math.clz32: No
    > Math.cosh: No
    > Math.expm1: No
    > Math.fround: No
    > Math.hypot: No
    > Math.imul: Yes
    > Math.log10: No
    > Math.log1p: No
    > Math.log2: No
    > Math.sign: No
    > Math.sinh: No
    > Math.tanh: No
    > Math.trunc: No
> Number properties: 0/7
    > Number.EPSILON: No
    > Number.MAX_SAFE_INTEGER: No
    > Number.MIN_SAFE_INTEGER: No
    > Number.isFinite: No
    > Number.isInteger: No
    > Number.isNaN: No
    > Number.isSafeInteger: No
> Object static methods: 0/4
    > Object.assign: No
    > Object.getOwnPropertySymbols: No
    > Object.is: No
    > Object.setPrototypeOf: No
> Object static methods accept primitives: 0/10
    > Object.freeze: No
    > Object.getOwnPropertyDescriptor: No
    > Object.getOwnPropertyNames: No
    > Object.getPrototypeOf: No
    > Object.isExtensible: No
    > Object.isFrozen: No
    > Object.isSealed: No
    > Object.keys: No
    > Object.preventExtensions: No
    > Object.seal: No
> Object.prototype.__proto__: 6/6
    > absent from Object.create(null): Yes
    > correct property descriptor: Yes
    > get prototype: Yes
    > present in Object.getOwnPropertyNames(): Yes
    > present in hasOwnProperty(): Yes
    > set prototype: Yes
> Promise: 0/8
    > Promise.all: No
    > Promise.all, generic iterables: No
    > Promise.prototype isn't an instance: No
    > Promise.race: No
    > Promise.race, generic iterables: No
    > Promise[Symbol.species]: No
    > basic functionality: No
    > constructor requires new: No
> Promise is subclassable: 0/4
    > Promise.all: No
    > Promise.race: No
    > basic functionality: No
    > correct prototype chain: No
> Proxy: 0/34
    > "apply" handler: No
    > "apply" handler invariant: No
    > "construct" handler: No
    > "construct" handler invariants: No
    > "defineProperty" handler: No
    > "defineProperty" handler invariants: No
    > "deleteProperty" handler: No
    > "deleteProperty" handler invariant: No
    > "get" handler: No
    > "get" handler invariants: No
    > "get" handler, instances of proxies: No
    > "getOwnPropertyDescriptor" handler: No
    > "getOwnPropertyDescriptor" handler invariants: No
    > "getPrototypeOf" handler: No
    > "getPrototypeOf" handler invariant: No
    > "has" handler: No
    > "has" handler invariants: No
    > "has" handler, instances of proxies: No
    > "isExtensible" handler: No
    > "isExtensible" handler invariant: No
    > "ownKeys" handler: No
    > "ownKeys" handler invariant: No
    > "preventExtensions" handler: No
    > "preventExtensions" handler invariant: No
    > "set" handler: No
    > "set" handler invariants: No
    > "set" handler, instances of proxies: No
    > "setPrototypeOf" handler: No
    > "setPrototypeOf" handler invariant: No
    > Array.isArray support: No
    > JSON.stringify support: No
    > Proxy.revocable: No
    > constructor requires new: No
    > no "prototype" property: No
> Proxy, internal 'defineProperty' calls: 0/2
    > SetIntegrityLevel: No
    > [[Set]]: No
> Proxy, internal 'deleteProperty' calls: 0/6
    > Array.prototype.copyWithin: No
    > Array.prototype.pop: No
    > Array.prototype.reverse: No
    > Array.prototype.shift: No
    > Array.prototype.splice: No
    > Array.prototype.unshift: No
> Proxy, internal 'get' calls: 0/36
    > Array.from: No
    > Array.prototype iteration methods: No
    > Array.prototype.concat: No
    > Array.prototype.pop: No
    > Array.prototype.reverse: No
    > Array.prototype.shift: No
    > Array.prototype.splice: No
    > Array.prototype.toString: No
    > ClassDefinitionEvaluation: No
    > CreateDynamicFunction: No
    > CreateListFromArrayLike: No
    > Date.prototype.toJSON: No
    > Error.prototype.toString: No
    > Function.prototype.bind: No
    > HasBinding: No
    > IteratorComplete, IteratorValue: No
    > JSON.stringify: No
    > Object.assign: No
    > Object.defineProperties: No
    > Promise resolve functions: No
    > RegExp constructor: No
    > RegExp.prototype.flags: No
    > RegExp.prototype.test: No
    > RegExp.prototype.toString: No
    > RegExp.prototype[Symbol.match]: No
    > RegExp.prototype[Symbol.replace]: No
    > RegExp.prototype[Symbol.search]: No
    > RegExp.prototype[Symbol.split]: No
    > String.prototype.match: No
    > String.prototype.replace: No
    > String.prototype.search: No
    > String.prototype.split: No
    > String.raw: No
    > ToPrimitive: No
    > ToPropertyDescriptor: No
    > instanceof operator: No
> Proxy, internal 'getOwnPropertyDescriptor' calls: 0/4
    > Function.prototype.bind: No
    > Object.assign: No
    > Object.prototype.hasOwnProperty: No
    > [[Set]]: No
> Proxy, internal 'ownKeys' calls: 0/3
    > SerializeJSONObject: No
    > SetIntegrityLevel: No
    > TestIntegrityLevel: No
> Proxy, internal 'set' calls: 0/11
    > Array.from: No
    > Array.of: No
    > Array.prototype.copyWithin: No
    > Array.prototype.fill: No
    > Array.prototype.pop: No
    > Array.prototype.push: No
    > Array.prototype.reverse: No
    > Array.prototype.shift: No
    > Array.prototype.splice: No
    > Array.prototype.unshift: No
    > Object.assign: No
> Reflect: 0/20
    > Reflect.apply: No
    > Reflect.construct: No
    > Reflect.construct creates instances from third argument: No
    > Reflect.construct sets new.target meta-property: No
    > Reflect.construct, Array subclassing: No
    > Reflect.construct, Function subclassing: No
    > Reflect.construct, Promise subclassing: No
    > Reflect.construct, RegExp subclassing: No
    > Reflect.defineProperty: No
    > Reflect.deleteProperty: No
    > Reflect.get: No
    > Reflect.getOwnPropertyDescriptor: No
    > Reflect.getPrototypeOf: No
    > Reflect.has: No
    > Reflect.isExtensible: No
    > Reflect.ownKeys, string keys: No
    > Reflect.ownKeys, symbol keys: No
    > Reflect.preventExtensions: No
    > Reflect.set: No
    > Reflect.setPrototypeOf: No
> RegExp "y" and "u" flags: 0/5
    > "u" flag: No
    > "u" flag, Unicode code point escapes: No
    > "u" flag, case folding: No
    > "y" flag: No
    > "y" flag, lastIndex: No
> RegExp is subclassable: 0/4
    > RegExp.prototype.exec: No
    > RegExp.prototype.test: No
    > basic functionality: No
    > correct prototype chain: No
> RegExp syntax extensions: 8/8
    > hyphens in character sets: Yes
    > incomplete patterns and quantifiers: Yes
    > invalid Unicode escapes: Yes
    > invalid backreferences become octal escapes: Yes
    > invalid character escapes: Yes
    > invalid control-character escapes: Yes
    > invalid hexadecimal escapes: Yes
    > octal escape sequences: Yes
> RegExp.prototype properties: 0/6
    > RegExp.prototype.flags: No
    > RegExp.prototype[Symbol.match]: No
    > RegExp.prototype[Symbol.replace]: No
    > RegExp.prototype[Symbol.search]: No
    > RegExp.prototype[Symbol.split]: No
    > RegExp[Symbol.species]: No
> RegExp.prototype.compile: Yes
> Set: 0/19
    > -0 key converts to +0: No
    > Set iterator prototype chain: No
    > Set.prototype isn't an instance: No
    > Set.prototype.add returns this: No
    > Set.prototype.clear: No
    > Set.prototype.delete: No
    > Set.prototype.entries: No
    > Set.prototype.forEach: No
    > Set.prototype.keys: No
    > Set.prototype.size: No
    > Set.prototype.values: No
    > Set.prototype[Symbol.iterator]: No
    > Set[Symbol.species]: No
    > basic functionality: No
    > constructor accepts null: No
    > constructor arguments: No
    > constructor invokes add: No
    > constructor requires new: No
    > iterator closing: No
> String static methods: 0/2
    > String.fromCodePoint: No
    > String.raw: No
> String.prototype HTML methods: 3/3
    > existence: Yes
    > quotes in arguments are escaped: Yes
    > tags' names are lowercase: Yes
> String.prototype methods: 0/10
    > String iterator prototype chain: No
    > String.prototype.codePointAt: No
    > String.prototype.endsWith: No
    > String.prototype.endsWith throws on RegExp: No
    > String.prototype.includes: No
    > String.prototype.normalize: No
    > String.prototype.repeat: No
    > String.prototype.startsWith: No
    > String.prototype.startsWith throws on RegExp: No
    > String.prototype[Symbol.iterator]: No
> Symbol: 0/11
    > JSON.stringify ignores symbols: No
    > Object(symbol): No
    > Object.defineProperty support: No
    > basic functionality: No
    > can convert with String(): No
    > cannot coerce to string or number: No
    > global symbol registry: No
    > new Symbol() throws: No
    > symbol keys are hidden to pre-ES6 code: No
    > symbols inherit from Symbol.prototype: No
    > typeof support: No
> Unicode code point escapes: 0/2
    > in identifiers: No
    > in strings: No
> WeakMap: 0/12
    > .has, .get and .delete methods accept primitives: No
    > WeakMap.prototype isn't an instance: No
    > WeakMap.prototype.delete: No
    > WeakMap.prototype.set returns this: No
    > basic functionality: No
    > constructor accepts null: No
    > constructor arguments: No
    > constructor invokes set: No
    > constructor requires new: No
    > frozen objects as keys: No
    > iterator closing: No
    > no WeakMap.prototype.clear method: No
> WeakSet: 0/11
    > .has and .delete methods accept primitives: No
    > WeakSet.prototype isn't an instance: No
    > WeakSet.prototype.add returns this: No
    > WeakSet.prototype.delete: No
    > basic functionality: No
    > constructor accepts null: No
    > constructor arguments: No
    > constructor invokes add: No
    > constructor requires new: No
    > iterator closing: No
    > no WeakSet.prototype.clear method: No
> __proto__ in object literals: 1/5
    > basic support: Yes
    > multiple __proto__ is an error: No
    > not a computed property: No
    > not a shorthand method: No
    > not a shorthand property: No
> arrow functions: 0/13
    > "this" unchanged by call or apply: No
    > 0 parameters: No
    > 1 parameter, no brackets: No
    > can't be bound, can be curried: No
    > correct precedence: No
    > lexical "arguments" binding: No
    > lexical "new.target" binding: No
    > lexical "super" binding in constructors: No
    > lexical "super" binding in methods: No
    > lexical "this" binding: No
    > multiple parameters: No
    > no "prototype" property: No
    > no line break between params and =>: No
> block-level function declaration: No
> class: 0/24
    > accessor properties: No
    > anonymous class: No
    > class expression: No
    > class name is lexically scoped: No
    > class statement: No
    > computed accessor properties: No
    > computed names, temporal dead zone: No
    > computed prototype methods: No
    > computed static accessor properties: No
    > computed static methods: No
    > constructor: No
    > constructor requires new: No
    > extends: No
    > extends expressions: No
    > extends null: No
    > implicit strict mode: No
    > is block-scoped: No
    > methods aren't enumerable: No
    > new.target: No
    > optional semicolons: No
    > prototype methods: No
    > static accessor properties: No
    > static methods: No
    > string-keyed methods: No
> const: 1/16
    > basic support: Yes
    > basic support (strict mode): No
    > cannot be in statements: No
    > cannot be in statements (strict mode): No
    > for loop statement scope: No
    > for loop statement scope (strict mode): No
    > for-in loop iteration scope: No
    > for-in loop iteration scope (strict mode): No
    > for-of loop iteration scope: No
    > for-of loop iteration scope (strict mode): No
    > is block-scoped: No
    > is block-scoped (strict mode): No
    > redefining a const (strict mode): No
    > redefining a const is an error: No
    > temporal dead zone: No
    > temporal dead zone (strict mode): No
> default function parameters: 0/7
    > arguments object interaction: No
    > basic functionality: No
    > defaults can refer to previous params: No
    > explicit undefined defers to the default: No
    > new Function() support: No
    > separate scope: No
    > temporal dead zone: No
> destructuring, assignment: 0/24
    > chained iterable destructuring: No
    > chained object destructuring: No
    > computed properties: No
    > defaults: No
    > empty patterns: No
    > iterable destructuring expression: No
    > iterator closing: No
    > nested: No
    > nested rest: No
    > object destructuring expression: No
    > object destructuring with primitives: No
    > parenthesised left-hand-side is a syntax error: No
    > rest: No
    > throws on null and undefined: No
    > trailing commas in iterable patterns: No
    > trailing commas in object patterns: No
    > with arrays: No
    > with astral plane strings: No
    > with generator instances: No
    > with generic iterables: No
    > with instances of generic iterables: No
    > with objects: No
    > with sparse arrays: No
    > with strings: No
> destructuring, declarations: 0/22
    > computed properties: No
    > defaults: No
    > defaults, let temporal dead zone: No
    > in catch heads: No
    > in for-in loop heads: No
    > in for-of loop heads: No
    > iterator closing: No
    > multiples in a single var statement: No
    > nested: No
    > object destructuring with primitives: No
    > rest: No
    > throws on null and undefined: No
    > trailing commas in iterable patterns: No
    > trailing commas in object patterns: No
    > with arrays: No
    > with astral plane strings: No
    > with generator instances: No
    > with generic iterables: No
    > with instances of generic iterables: No
    > with objects: No
    > with sparse arrays: No
    > with strings: No
> destructuring, parameters: 0/23
    > 'arguments' interaction: No
    > computed properties: No
    > defaults: No
    > defaults, new Function() support: No
    > defaults, separate scope: No
    > empty patterns: No
    > in parameters, function 'length' property: No
    > iterator closing: No
    > nested: No
    > new Function() support: No
    > object destructuring with primitives: No
    > rest: No
    > throws on null and undefined: No
    > trailing commas in iterable patterns: No
    > trailing commas in object patterns: No
    > with arrays: No
    > with astral plane strings: No
    > with generator instances: No
    > with generic iterables: No
    > with instances of generic iterables: No
    > with objects: No
    > with sparse arrays: No
    > with strings: No
> for..of loops: 0/9
    > iterator closing, break: No
    > iterator closing, throw: No
    > with arrays: No
    > with astral plane strings: No
    > with generator instances: No
    > with generic iterables: No
    > with instances of generic iterables: No
    > with sparse arrays: No
    > with strings: No
> function "name" property: 3/17
    > accessor properties: No
    > bound functions: No
    > class expressions: No
    > class prototype methods: No
    > class statements: No
    > class static methods: No
    > function expressions: Yes
    > function statements: Yes
    > isn't writable, is configurable: No
    > new Function: Yes
    > object methods (class): No
    > object methods (function): No
    > shorthand methods: No
    > shorthand methods (no lexical binding): No
    > symbol-keyed methods: No
    > variables (class): No
    > variables (function): No
> generators: 0/27
    > %GeneratorPrototype%: No
    > %GeneratorPrototype% prototype chain: No
    > %GeneratorPrototype%.constructor: No
    > %GeneratorPrototype%.return: No
    > %GeneratorPrototype%.throw: No
    > basic functionality: No
    > can't use "this" with new: No
    > computed shorthand generators: No
    > computed shorthand generators, classes: No
    > correct "this" binding: No
    > generator function expressions: No
    > sending: No
    > shorthand generator methods: No
    > shorthand generator methods, classes: No
    > shorthand generators can't be constructors: No
    > string-keyed shorthand generator methods: No
    > yield * on non-iterables is a runtime error: No
    > yield *, arrays: No
    > yield *, astral plane strings: No
    > yield *, generator instances: No
    > yield *, generic iterables: No
    > yield *, instances of iterables: No
    > yield *, iterator closing: No
    > yield *, iterator closing via throw(): No
    > yield *, sparse arrays: No
    > yield *, strings: No
    > yield operator precedence: No
> let: 0/12
    > basic support: No
    > basic support (strict mode): No
    > cannot be in statements: No
    > cannot be in statements (strict mode): No
    > for loop statement scope: No
    > for loop statement scope (strict mode): No
    > for/for-in loop iteration scope: No
    > for/for-in loop iteration scope (strict mode): No
    > is block-scoped: No
    > is block-scoped (strict mode): No
    > temporal dead zone: No
    > temporal dead zone (strict mode): No
> miscellaneous: 2/10
    > Invalid Date: Yes
    > RegExp constructor can alter flags: No
    > RegExp.prototype.toString generic and uses "flags" property: No
    > accessors aren't constructors: No
    > built-in prototypes are not instances: No
    > duplicate property names in strict mode: No
    > function 'length' is configurable: No
    > no assignments allowed in for-in head: No
    > no escaped reserved words as identifiers: No
    > no semicolon needed after do-while: Yes
> miscellaneous subclassables: 0/6
    > Boolean is subclassable: No
    > Error is subclassable: No
    > Map is subclassable: No
    > Number is subclassable: No
    > Set is subclassable: No
    > String is subclassable: No
> new.target: 0/2
    > assignment is an early error: No
    > in constructors: No
> non-strict function semantics: 2/3
    > function statements in if-statement clauses: Yes
    > hoisted block-level function declaration: No
    > labeled function statements: Yes
> object literal extensions: 0/6
    > computed accessors: No
    > computed properties: No
    > computed shorthand methods: No
    > shorthand methods: No
    > shorthand properties: No
    > string-keyed shorthand methods: No
> octal and binary literals: 0/4
    > binary literals: No
    > binary supported by Number(): No
    > octal literals: No
    > octal supported by Number(): No
> own property order: 4/7
    > JSON.parse: Yes
    > JSON.stringify: Yes
    > Object.assign: No
    > Object.getOwnPropertyNames: Yes
    > Object.keys: Yes
    > Reflect.ownKeys, string key order: No
    > Reflect.ownKeys, symbol key order: No
> proper tail calls (tail call optimisation): 0/2
    > direct recursion: No
    > mutual recursion: No
> prototype of bound functions: 0/5
    > arrow functions: No
    > basic functions: No
    > classes: No
    > generator functions: No
    > subclasses: No
> rest parameters: 0/5
    > arguments object interaction: No
    > basic functionality: No
    > can't be used in setters: No
    > function 'length' property: No
    > new Function() support: No
> spread (...) operator: 0/15
    > spreading non-iterables is a runtime error: No
    > with arrays, in array literals: No
    > with arrays, in function calls: No
    > with astral plane strings, in array literals: No
    > with astral plane strings, in function calls: No
    > with generator instances, in arrays: No
    > with generator instances, in calls: No
    > with generic iterables, in arrays: No
    > with generic iterables, in calls: No
    > with instances of iterables, in arrays: No
    > with instances of iterables, in calls: No
    > with sparse arrays, in array literals: No
    > with sparse arrays, in function calls: No
    > with strings, in array literals: No
    > with strings, in function calls: No
> super: 0/8
    > constructor calls use correct "new.target" binding: No
    > expression in constructors: No
    > in methods, method calls: No
    > in methods, property access: No
    > is statically bound: No
    > method calls use correct "this" binding: No
    > statement in constructors: No
    > super() invokes the correct constructor: No
> template literals: 0/5
    > basic functionality: No
    > line break normalisation: No
    > passed array is frozen: No
    > tagged template literals: No
    > toString conversion: No
> typed arrays: 19/46
    > %TypedArray%.from: No
    > %TypedArray%.of: No
    > %TypedArray%.prototype.copyWithin: No
    > %TypedArray%.prototype.entries: No
    > %TypedArray%.prototype.every: No
    > %TypedArray%.prototype.fill: No
    > %TypedArray%.prototype.filter: No
    > %TypedArray%.prototype.find: No
    > %TypedArray%.prototype.findIndex: No
    > %TypedArray%.prototype.forEach: No
    > %TypedArray%.prototype.indexOf: No
    > %TypedArray%.prototype.join: No
    > %TypedArray%.prototype.keys: No
    > %TypedArray%.prototype.lastIndexOf: No
    > %TypedArray%.prototype.map: No
    > %TypedArray%.prototype.reduce: No
    > %TypedArray%.prototype.reduceRight: No
    > %TypedArray%.prototype.reverse: No
    > %TypedArray%.prototype.slice: No
    > %TypedArray%.prototype.some: No
    > %TypedArray%.prototype.sort: No
    > %TypedArray%.prototype.subarray: Yes
    > %TypedArray%.prototype.values: No
    > %TypedArray%.prototype[Symbol.iterator]: No
    > %TypedArray%[Symbol.species]: No
    > ArrayBuffer[Symbol.species]: No
    > DataView (Float32): Yes
    > DataView (Float64): Yes
    > DataView (Int16): Yes
    > DataView (Int32): Yes
    > DataView (Int8): Yes
    > DataView (Uint16): Yes
    > DataView (Uint32): Yes
    > DataView (Uint8): Yes
    > Float32Array: Yes
    > Float64Array: Yes
    > Int16Array: Yes
    > Int32Array: Yes
    > Int8Array: Yes
    > Uint16Array: Yes
    > Uint32Array: Yes
    > Uint8Array: Yes
    > Uint8ClampedArray: Yes
    > constructors accept generic iterables: No
    > constructors require new: Yes
    > correct prototype chains: No
> well-known symbols: 0/26
    > Symbol.hasInstance: No
    > Symbol.isConcatSpreadable: No
    > Symbol.iterator, arguments object: No
    > Symbol.iterator, existence: No
    > Symbol.match: No
    > Symbol.match, RegExp constructor: No
    > Symbol.match, String.prototype.endsWith: No
    > Symbol.match, String.prototype.includes: No
    > Symbol.match, String.prototype.startsWith: No
    > Symbol.replace: No
    > Symbol.search: No
    > Symbol.species, Array.prototype.concat: No
    > Symbol.species, Array.prototype.filter: No
    > Symbol.species, Array.prototype.map: No
    > Symbol.species, Array.prototype.slice: No
    > Symbol.species, Array.prototype.splice: No
    > Symbol.species, Promise.prototype.then: No
    > Symbol.species, RegExp.prototype[Symbol.split]: No
    > Symbol.species, existence: No
    > Symbol.split: No
    > Symbol.toPrimitive: No
    > Symbol.toStringTag: No
    > Symbol.toStringTag affects existing built-ins: No
    > Symbol.toStringTag, misc. built-ins: No
    > Symbol.toStringTag, new built-ins: No
    > Symbol.unscopables: No

less_details.txt

Overall coverage: 10%
> Array is subclassable: 0/11
> Array static methods: 0/11
> Array.prototype methods: 0/10
> Date.prototype[Symbol.toPrimitive]: No
> Function is subclassable: 0/6
> HTML-style comments: Yes
> Map: 0/19
> Math methods: 1/17
> Number properties: 0/7
> Object static methods: 0/4
> Object static methods accept primitives: 0/10
> Object.prototype.__proto__: 6/6
> Promise: 0/8
> Promise is subclassable: 0/4
> Proxy: 0/34
> Proxy, internal 'defineProperty' calls: 0/2
> Proxy, internal 'deleteProperty' calls: 0/6
> Proxy, internal 'get' calls: 0/36
> Proxy, internal 'getOwnPropertyDescriptor' calls: 0/4
> Proxy, internal 'ownKeys' calls: 0/3
> Proxy, internal 'set' calls: 0/11
> Reflect: 0/20
> RegExp "y" and "u" flags: 0/5
> RegExp is subclassable: 0/4
> RegExp syntax extensions: 8/8
> RegExp.prototype properties: 0/6
> RegExp.prototype.compile: Yes
> Set: 0/19
> String static methods: 0/2
> String.prototype HTML methods: 3/3
> String.prototype methods: 0/10
> Symbol: 0/11
> Unicode code point escapes: 0/2
> WeakMap: 0/12
> WeakSet: 0/11
> __proto__ in object literals: 1/5
> arrow functions: 0/13
> block-level function declaration: No
> class: 0/24
> const: 1/16
> default function parameters: 0/7
> destructuring, assignment: 0/24
> destructuring, declarations: 0/22
> destructuring, parameters: 0/23
> for..of loops: 0/9
> function "name" property: 3/17
> generators: 0/27
> let: 0/12
> miscellaneous: 2/10
> miscellaneous subclassables: 0/6
> new.target: 0/2
> non-strict function semantics: 2/3
> object literal extensions: 0/6
> octal and binary literals: 0/4
> own property order: 4/7
> proper tail calls (tail call optimisation): 0/2
> prototype of bound functions: 0/5
> rest parameters: 0/5
> spread (...) operator: 0/15
> super: 0/8
> template literals: 0/5
> typed arrays: 19/46
> well-known symbols: 0/26