With the modal option set to true, elements in the background are still available in the AOM about jquery-ui HOT 5 OPEN

Thanks for the report. Does the issue you describe exist when jQuery UI 1.12.1 is used or only with jQuery UI 1.13.0 or newer?

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I've just rechecked, in Drupal 10.2.5. and 11.x-dev jQuery UI Dialog 1.13.2 is used. Took me a while to go back in versions to finally fin, but turns out drupal 9.0.0 was using jQuery UI Dialog 1.12.1. And for all three versions of Drupal 11.x-dev, 10.2.5, and 9.0.0 the problem described in the issue summary exists.

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Thanks for the info. Since the issue is already in 1.12, given limited team resources it's not likely to be fixed by the UI team; see the project status at https://blog.jqueryui.com/2021/10/jquery-maintainers-update-and-transition-jquery-ui-as-part-of-overall-modernization-efforts/. PRs are welcome if they're not too complex and contain tests.

On a personal note, I definitely appreciate how comprehensive this bug report is. I got interested why jQuery UI hasn't used your proposed solution so far considering its strong focus on accessibility back when it had a much larger team but it seems this API is quite new and it arrived in browsers first in 2019-2020: https://caniuse.com/mdn-api_element_ariamodal. Most of the regular development of jQuery UI ended in 2016.

I'd definitely appreciate a PR with a fix for this issue. Remember to add tests if you submit one but please feel free to ask questions if you get stuck on a PR.

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