Filing this bug on implementing contain: inline-size, which turns on inline size containment, as described in css-contain-3:
https://www.w3.org/TR/css-contain-3/#valdef-contain-inline-size

There are some tests for this feature here:
https://wpt.fyi/results/css/css-contain?label=master&label=experimental&aligned&q=contain-inline-size

Right now, all browsers fail all-but-one of those tests (the one exception being contain-inline-size-table.html which everyone passes because it's a test for the feature not doing anything on tables, since size containment explicitly doesn't apply to tables).

If I visit chrome://flags/ in Chrome Dev Edition and enable their experimental support for Container Queries, then it looks like they pass all the tests except for http://wpt.live/css/css-contain/contain-inline-size-multicol.html .

Change in progress, but will still fail relevant WPT contain-inline-size-bfc-floats-001.html due to Bug 1763431.

https://hg.mozilla.org/mozilla-central/rev/e3fd585c58fa

Comment on attachment 9273074 [details]
Bug 1755565 - Simplify nsVideoFrame::GetMinISize, r=dholbert

Revision D144182 was moved to bug 1765654. Setting attachment 9273074 [details] to obsolete.

Closing this bug as FIXED, since the main patch landed & this was only being left open for the followup refactoring patch, which I've now moved to bug 1765654 due to the fact that it's not actually a pure refactoring.

Hi Daniel, I've added dev-docs-complete keyword for this bug; the following GitHub issue is a parent task to track all documentation changes related to this:

https://github.com/mdn/content/issues/19831

Thanks!

Good to know, thanks!