PleaseThe HTML5 Please blog
Notes on HTML5, CSS, JavaScript APIs and shipping modern web features without breaking older browsers. Contributions from guest authors welcome.
News
HTML5 Please is back: restoring a web development classic
The original HTML5 Please reference is online again, rebuilt from its open source roots as a fast, ad free guide to the modern web platform.
GuidesHTML5 features you can finally drop the polyfill for in 2026
A decade ago these features needed prefixes, shims and fallbacks. Today they are baseline. Here is what you can safely delete from your build.