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html5 checker
HTML Validator Check web compliance with HTML5 standard.
TLS SSL Checker. HTML Validator is a simple tool to reveal parts of your HTML code that do not conform to the HTML5 standard by the World Wide Web Consortium W3C. Over the years, web developers attempted to make their web sites better and easier to use for their visitors, but quite often they faced technical issues of erratic behaviour of different browsers, badly designed or weak protocols, that made them introduce number of hacks into their webs, which made the situation even worse in the long run.
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
HTML5 Validator.
HTML Conformance Checkers WHATWG.
Nu Html Checker. Address of page to check: Check. Please let us know if you are working on a conformance checker. Copyright 2018 WHATWG Apple, Google, Mozilla, Microsoft. This work is licensed under a Creative Commons Attribution 4.0 International License.
Free Online HTML Validator
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.
HTML / HTML5 / XHTML / WCAG / Section 508 / CSS / Links / Spelling.
New Overall Issues that apply across all pages tested. Simplified selection of HTML5, to choice between current draft or recommendation. More WCAG 2.0 updates. 17th December 2017. Total Validator v11.8.0 released, updated with the latest changes to the standards, together with.:
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. XHTML5 Validator.
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.

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