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Every HTML page must have a valid HTML lang attributeOpening <html> element needs to relay the primary language of content.
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Tracking Pixel Code - Accessibility IssueTracking pixels like Facebook's and Google's should be implemented with care.
404 Pages: Using Correct Link TypesUsing correct link types on your 404 page will ensure your site is accessible and SEO-friendly!
Allow Zooming and Scaling on WebpagesZooming and scaling must not be disabled in the viewport meta tag.
Ensure focus is visibleMake sure focus is visible for your keyboard users.
ID attribute value must be uniqueNo more than one element with the same id in an HTML document.