Is there a method to develop a mini JavaScript function that can parse an HTML document, extract specific selectors from a lengthy CSS file that contains over 2000 lines, and create a new CSS file with only the necessary styles?
Is there a method to develop a mini JavaScript function that can parse an HTML document, extract specific selectors from a lengthy CSS file that contains over 2000 lines, and create a new CSS file with only the necessary styles?
To make use of IE9’s robust StyleSheet DOM, simply execute the following script in your JavaScript console:
var used = [], unused = [];
[].forEach.call(document.styleSheets, function (ss) {
[].forEach.call(ss.cssRules, function (r) {
if (document.querySelector(r.selectorText)) {
used.push(r);
} else {
unused.push(r);
}
});
});
console.log("Selectors found on this page: " + used.length);
console.log("Selectors not found on this page: " + unused.length);
used.map(function (rule) {
return rule.cssText;
}).join("\n");
By running this script, only the necessary rules for a specific page will be displayed in the console.
If you're looking for a non-JavaScript solution, have you explored the resource called Dust Me?
According to the website:
Dust Me extracts all selectors from stylesheets on the current page and identifies which ones are not being utilized. This data can be saved for future reference to track unused selectors across pages.
You have the option to test pages individually or crawl an entire site, resulting in a comprehensive profile of unused selectors.
Unfortunately, Dust Me is not compatible with Firefox 8.
If you're interested in a JavaScript alternative, you can check out this solution. I personally haven't tested it, but Dust Me has proven effective for me in the past.
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