I'd like to find a command-line tool for Linux that will validate both XHTML and CSS. As silly as this may sound, I'd like it to be able to operate offline.
W3Schools is one of the top contenders among the Validation tools. It is used to check the correctness of w3. css. It provides validation warnings for CCs1,CSS2, CSS3, CSS4 properties.
You can validate both HTML and CSS files. You can use any commercial software package or free online application, such as the following World Wide Web Consortium (W3C) validators: W3C CSS Validator at http://jigsaw.w3.org/css-validator/ W3C HTML Validator at http://validator.w3.org/
An HTML validator is a quality assurance program used to check Hypertext Markup Language ( HTML ) markup elements for syntax errors. A validator can be a useful tool for an HTML user who receives data electronically from a variety of input sources.
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