PUBLIC MARKS with tags dev & best

For use on production websites with any amount of traffic. Files are served via MaxCDN's super fast global CDN. No traffic limits or throttling. It's best to use a specific tag or commit hash in the URL (not a branch). Files are cached permanently after the first request. The catch: this is a free service, so there are no uptime or support guarantees.

How to Write Regular Expressions ? The best way to learn regular expressions is by using an example. Let's say you're building a web page with a phone number input.

When you profile a web page with Page Speed, it evaluates the page's conformance to a number of different rules. These rules are general front-end best practices you can apply at any stage of web development. We provide documentation of each of the rules here