Tests: Backport the hidden="until-found" attr tests from 3.x-stable
#5619
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Summary
The
hiddenattribute used to be a boolean one but it gained a newuntil-foundeventually. This led us to change the way we handle boolean attributes in jQuery 4.0 in gh-5452 to avoid these issues in the future.We haven't added an explicit test for the
"until-found"value of thehiddenattribute which triggered this decision so far, though. Backport the test from gh-5607 which landed on3.x-stableso that we do test it.Ref gh-5452
Ref gh-5607
(cherry picked from commit 85290c5)
Checklist
If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com