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Learn what you can do with the new and incredibly useful test tools from WebPageTest – with no coding required.

The HTMLRewriter() API gives us the ability to use jQuery-style element selectors to attach to HTML elements in raw page source to run JavaScript from that foothold.

In this article, we demonstrate an evolution from an original concept for a testbed to a project suitable for our future events and articles.

Here is how to test Core Web Vitals scores and code changes using Cloudflare Workers as a reverse proxy and WebpageTest.

SharedArrayBuffer warnings in Search Console: Clarifying a new cross-origin isolation security policy Android Chrome 88 and desktop Chrome 91, plus Firefox 79+ now implement SharedArrayBuffers again after Spectre caused a multiyear security blackout on the feature until new security requirements were in place. Detlef Johnson on March 16, 2021 at 12:07 pm More Web-facing pages are an information security battle zone as we fight hackers who try to steal company secrets. Modern webpages oft...

Lighthouse now serves as a beacon for warning you when your project includes old libraries that have modern alternatives.