A professional frontend developers's base HTML/CSS/JS template for a fast, robust and future-safe site. Cross-browser normalization, performance optimizations, even optional features like cross-domain XHR and Flash.
Elaborates on a hand-picked selection of features from the HTML5 specification and other fine standards. We work hard to add and update content, links, APIs, and actively maintain this fine resource.
Describes the differences of these documents from HTML4, and calls out cases where HTML is different from HTML5. This document may not provide accurate information as the specifications are still actively in development.
The HTML5 test score is an indication of how well your browser supports the upcoming HTML5 standard and related specifications. Find out which parts of HTML5 are already supported by your browser today and compare the results with other browsers.