HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

Attribute “controlslist” not allowed on element “video” at this point.

The controlslist attribute on the <video> element is experimental, and not yet valid in the current HTML5 standard, so you should use it with caution as it may not be supported by all browsers.

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Still checking your large sites one page at a time?

Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.