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Support `transition-behaviour` for `display` and `content-visibility`

Proposed by web-platform-tests/interop#1384
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This is support for animating the visibility of an object, which is very useful to transition the disappearance of an element.

This was proposed last year, but not selected: https://github.com/web-platform-tests/interop/issues/1112

Discussion on GitHub (1)

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Strict feedback template: Please be as concrete as possible. Specific examples from your production apps or projects provide the highest-value signal to standards editors and browser engineers.
Add your specific real-world use cases, even if they seem obvious to you.
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Are you having to use another feature instead, a polyfill, or is it blocking you completely? Why are the alternatives worse?
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