jamie-pate/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>window.matchMedia() #jsbench #jsperf</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
</head>
<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
</body>
</html>

## suite.js
"use strict";

(function (factory) {
	if (typeof Benchmark !== "undefined") {
		factory(Benchmark);
	} else {
		factory(require("benchmark"));
	}
})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
		function dpi() {
					function testDPI(dpi) {
						return window.matchMedia(`(max-resolution: ${dpi}dpi)`).matches;
					}
					function bisect(low, high, func) {
						const mid = parseInt(((high - low) / 2) + low, 10);


						if (high - low <= 1) {
							return func(high) ? high : low;
						}
						if (func(mid)) {
							return bisect(low, mid, func);
						}
						return bisect(mid, high, func);
					}
					try {
						const dpi = bisect(0, 800, testDPI);
						return dpi >= 96 ? dpi : 96;
					} catch (e) {
						return 96;
					}

		}
		__dpi = 0
	};

	Benchmark.prototype.teardown = function () {
		console.log(__dpi)
	};

	suite.add("__dpi += dpi()", function () {
		__dpi += dpi()
	});

	suite.add("__dpi += window.devicePixelRatio * 96", function () {
		__dpi += window.devicePixelRatio * 96
	});

	suite.on("cycle", function (evt) {
		console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
		console.log(new Array(30).join("-"));

		var results = evt.currentTarget.sort(function (a, b) {
			return b.hz - a.hz;
		});

		results.forEach(function (item) {
			console.log((idx + 1) + ". " + item);
		});
	});

	console.log("window.matchMedia() #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>window.matchMedia() #jsbench #jsperf</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
	</head>
	<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
	</body>
	</html>
	"use strict";

	(function (factory) {
	if (typeof Benchmark !== "undefined") {
	factory(Benchmark);
	} else {
	factory(require("benchmark"));
	}
	})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
	function dpi() {
	function testDPI(dpi) {
	return window.matchMedia(`(max-resolution: ${dpi}dpi)`).matches;
	}
	function bisect(low, high, func) {
	const mid = parseInt(((high - low) / 2) + low, 10);


	if (high - low <= 1) {
	return func(high) ? high : low;
	}
	if (func(mid)) {
	return bisect(low, mid, func);
	}
	return bisect(mid, high, func);
	}
	try {
	const dpi = bisect(0, 800, testDPI);
	return dpi >= 96 ? dpi : 96;
	} catch (e) {
	return 96;
	}

	}
	__dpi = 0
	};

	Benchmark.prototype.teardown = function () {
	console.log(__dpi)
	};

	suite.add("__dpi += dpi()", function () {
	__dpi += dpi()
	});

	suite.add("__dpi += window.devicePixelRatio * 96", function () {
	__dpi += window.devicePixelRatio * 96
	});

	suite.on("cycle", function (evt) {
	console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
	console.log(new Array(30).join("-"));

	var results = evt.currentTarget.sort(function (a, b) {
	return b.hz - a.hz;
	});

	results.forEach(function (item) {
	console.log((idx + 1) + ". " + item);
	});
	});

	console.log("window.matchMedia() #jsbench #jsperf");
	console.log(new Array(30).join("-"));
	suite.run();
	});