W3C Markup Validation Service checks markup validity and more, offering tools for specific content and broken links.
Dotcom-Tools provide snapshots of site availability and performance globally, free for up to 250 tests per month.
Dead Link Checker crawls sites to identify broken links, offering account creation for multiple checks and automated reports.
Yellow Lab Tools aids in speeding up heavy web pages by detecting issues with HTML, CSS, JavaScript, and more, providing detailed guidance for fixes.
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