W3C Validator

• Check a page's HTMLCheck the HTML of a public web page against the web's standards with W3C's Nu Html Checker: whether it is valid, how many errors and warnings it has, and each message with its line, column and the code it is about, plus a link to the full report.
• Check HTML markupCheck HTML you provide, such as a page or email template made in an earlier step or one that isn't public yet, with W3C's Nu Html Checker. XHTML and SVG work too. Gives whether it is valid and each error and warning with its line and column.
• Check a page's CSSCheck the CSS of a public web page (every style sheet it links and its style attributes), or of one style sheet, with W3C's CSS Validation Service: whether it is valid, how many errors and warnings it has, and each message with its line, selector and style sheet.
• Check CSS codeCheck CSS you provide, pasted in or made in an earlier step, with W3C's CSS Validation Service: whether it is valid for the CSS level you choose, and each error and warning with its line and selector.
• Check a page's HTML and CSSCheck a public web page's HTML and its CSS in one step, with W3C's Nu Html Checker and CSS Validation Service: whether both are valid, the errors and warnings in each, and links to both full reports.

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