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html5 checker
Free Online HTML Validator FreeFormatter.com.
Validates HTML files for compliance against the W3C standards and performs linting to assess code quality against best practices. Find missing or unbalanced HTML tags in your documents, stray characters, duplicate IDs, missing or invalid attributes and other recommendations. Supports HTML5, SVG 1.1, MathML 3.0, ITS 2.0, RDFa Lite 1.1.
The W3C Markup Validation Service.
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.
Detect my Browser: Browser, Browser Plugin, HTML5 and CSS3 detection.
HTML5 Input Types. HTML5 Input Attributes. Detect my browser. checks your browser. This page gives you information about your web browser and its plugins, CSS3 and HTML 5 capabilities. It uses various javascript libraries for the detection of your browser.
HTML5test How well does your browser support HTML5?
Find out which parts of HTML5 are supported by your browser today and compare the results with other browsers. The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to test the functionality of each feature it does detect.
Validator.nu XHTML5 Validator.
HTML5 Validator.
Rocket Validator. The fastest way to validate HTML5 on large sites.
Validate large sites. Our web spider will crawl your site and check up to 5000, pages for HTML5 conformance and accessibility, with a single click. You can also submit an XML sitemap to specify exactly the pages to validate, for increased performance. We'll' scan the web pages found within your site in search of accessibility violations using the axe-core accessibility engine. For each A11Y violation found, we'll' provide additional help and actionable items. Check out the list of accessibility rules checked. Your pages will be checked for HTML markup validation with the W3C's' Nu HTML Checker, like in validator.w3.org/nu.

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