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Chrome
Web store Download Style-Validator chrome extension. A CSS Validator that can check the combination of styles and elements after browser rendering. and install in your Google chrome browser. This is Direct Style-Validator Crx download for Chrome it is also called Style-Validator offline CRX for chrome Download. This Style-Validator is used to A CSS Validator that can check the combination of styles and elements after browser rendering.
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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!