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HTML Checking for Large Sites

Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.

There’s no role in ARIA named presentational, you probably mean presentation.

The presentation role and its synonym none remove an element’s implicit ARIA semantics from being exposed to the accessibility tree.

The content of the element will still be available to assistive technologies; it is only the semantics of the container — and in some instance, required associated descendants — which will no longer expose their mappings to the accessibility API.

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Related W3C validator issues