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07-Jun-2020 14:18
Vendor extensions can create warnings in the W3 CSS validation prosess. CSS uses vendor extensions to support older browsers.Browser vendors are working to stop using prefixes in future browser versions.This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available.
Some browsers use vendor extensions to simulate CSS3 and CSS4 properties.
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Many major web browsers are often tolerant of certain types of error, and may display a document successfully even if it is not syntactically correct.
Certain other XML documents can also be validated if they refer to an internal or external DTD.
Also, for the "img" element, width="really wide" is also accepted as valid.