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WCAG 2.1 Error References
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Web Accessibility Checker
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HTML Validation Pro
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What are the System/Server Requirements for the HTML Validation Plugin?
What are the System/Server Requirements for the HTML Validation Plugin?
Linux/Unix, Apache webserver with MYSQL and PHP 5.6 or PHP 7 >
To use content filtering features such as auto correction of issues, Multibyte String and Fileinfo Extensions must be enabled in PHP
Tested on WordPress 5.3 >
WordPress cron
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