How Can I Efficiently Parse CSS in JavaScript Using the CSSOM?

Parsing CSS in JavaScript / jQuery

To parse CSS in JavaScript, you can leverage the browser's built-in CSSOM interface. This eliminates the need for custom libraries and provides a standardized way to access CSS data.

JavaScript for fetching the CSS rules, directly from CSSOM:

var rulesForCssText = function (styleContent) {
    var doc = document.implementation.createHTMLDocument(""),
        styleElement = document.createElement("style");

    styleElement.textContent = styleContent;
    // the style will only be parsed once it is added to a document
    doc.body.appendChild(styleElement);

    return styleElement.sheet.cssRules;
};

Each CSS rule returned by rulesForCssText can be further inspected using rule.style, which provides access to individual CSS properties.

For instance, consider the CSS:

a {
  color: red;
}

Using rulesForCssText, you can retrieve the rule for the "a" style and access its properties:

const rules = rulesForCssText('a { color: red; }');
const aRule = rules[0];
console.log(aRule.selectorText); // Outputs: "a"
console.log(aRule.style.color); // Outputs: "red"

This alternative approach resolves the issue faced in your custom parsing implementation, as it does not rely on manual string splitting and handling special cases like URIs in property values.

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