Re: [w3c/webcomponents] Generic programs can't reliably use/manipulate documents via the DOM (#640)

Another thing. The canvas element might be hostile to Sitecues's dictation feature because any text drawn in the canvas can't be read by Sitecues unless it implements OCR of some sort. But we didn't remove the canvas element. We instead added enhancements to the canvas to make it more accessible so that tools like Sitecues and browser's native assertive technology could get necessary information out of a canvas element.

Similarly, if there is a specific scenario in which a closed shadow trees would break use cases, then we can make improvements to custom elements or shadow DOM API to address those use cases instead of letting them explore contents inside shadow trees manually. This approach has an added benefit of letting each component decide what's visible to tools like Sitecues.

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