Dumps the Computed CSS stylesheet of an element and it's children for diff use.

dump-css.js

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var simmer = Simmer.noConflict();
/* dump-css MIT 2020 */

// Don't emit CSS for any rule specified here
const ruleDenylist = [
    'inline-size',
    'perspective-origin',
    'transform-origin'
];

// Don't emit CSS for any vendor prefixed rule (starting with a dash)
const denyVendorPrefix = true;

// Don't emit CSS for the root element
const skipRootElement = true;

// Cache simmer paths and parent CSS rules 
var cacheContainer = {
    'cache': {}
}

function getElementCSS(rootElement, targetElement) {
    // Get the computed CSS of the targetElement 
    // CSS that is identical to a parent is discarded
    // Parent searching stops at the rootElement.
    let cache = cacheContainer.cache;
    let computedStyle = window.getComputedStyle(targetElement);
    let targetElementStyle = {};
    for (let ruleName of computedStyle) {
        if (denyVendorPrefix && ruleName[0] == '-') continue;
        if (ruleDenylist && ruleDenylist.includes(ruleName)) continue;
        targetElementStyle[ruleName] = computedStyle[ruleName];
    }
    let searchPath = targetElement.parentPath;
    let searchElement = undefined;
    do {
        let searchCacheEntry = cache[searchPath];
        if (!searchCacheEntry) return targetElementStyle;
        searchElement = searchCacheEntry.element;
        let searchCss = searchCacheEntry.css;
        for (let styleName in searchCss) {
            if (targetElementStyle[styleName] == searchCss[styleName]) {
                delete targetElementStyle[styleName];
            }
        }
        searchPath = searchElement.parentPath;
    } while (searchPath && searchElement != rootElement);
    return targetElementStyle;
}

function dumpCSS(rootElement) {
    let elementStack = [rootElement];
    let cache = cacheContainer.cache;
    let cacheOrder = [];
    while (elementStack.length) {
        let element = elementStack.shift();
        let elementPath = element.elementPath = simmer(element);
        let children = Array.apply(null, element.children);
        children.forEach(child => child.parentPath = elementPath);
        if (children.length) {
            elementStack.push(...children);
        }
        cacheOrder.push(elementPath);
        cache[elementPath] = {
            element: element,
            css: getElementCSS(rootElement, element)
        };
    }
    
    if (skipRootElement) cacheOrder.shift();
    let generatedStylesheetTable = [];
    for (let elementPath of cacheOrder) {
        let elementCacheEntry = cache[elementPath];
        if (!elementCacheEntry) continue;
        let elementCss = elementCacheEntry.css;
        if (Object.keys(elementCss).length) { // It's possible there could be no CSS rules for this element, and we wouldn't want to emit it. 
            generatedStylesheetTable.push(elementPath + " {");
            for (let ruleName in elementCss) {
                generatedStylesheetTable.push('  ' + ruleName + ': ' + elementCss[ruleName] + ';');
            }
            generatedStylesheetTable.push("}");
        }
    }
    return generatedStylesheetTable.join('\n');
}