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Chrome
Web store Download W3C Validator chrome extension. Validate documents. NOT the official W3C Validator, but using the official API and install in your Google chrome browser. This is Direct W3C Validator Crx download for Chrome it is also called W3C Validator offline CRX for chrome Download. This W3C Validator is used to Validate documents. NOT the official W3C Validator, but using the official API
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Click the icon in the address bar or press Alt+Shift+V to validate the current page. Results can be seen in Chrome's JS console.
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Open the current tab in Schema.org Validator by Break The Web
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Check TLSA records
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This script localizes WME Validator for Kentucky. You also need the main package (WME Validator) installed.
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Automatically checks each page for AMP validation.
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Checks each page for Signed-Exchange (SXG) validation.
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Validating web page
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A validator for Universal Analytics implementations
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A HTML5 validation library, using a JavaScript port of the excellent TIDY library
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Validate OIBs from context menu with this extension!