Validator.nuThis tool is an ongoing experiment in better HTML checking, and its behavior remains subject to change Validator.nu (X)HTML5 Validator (Living Validator)Validator InputDocument
html5.org — HTML revisited
HTML5 is the latest version of HTML and XHTML. The HTML Standard defines a single language that can be written in HTML and XML. It attempts to solve issues found in previous iterations of HTML and addresses the needs of Web Applications, an area previously not adequately covered by HTML. Here are several resources worth exploring: WHATWG FAQ The Web Platform Nu Html Checker HTML Standard on GitHub
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