''DevTools bug'': link to a [https://bugzilla.mozilla.org/enter_bug.cgi?product=devtools Developer Tools bug] coordinating work with the DevTools team to build tools for this feature.<br />
''Other browsers'': address with "shipped" (since version X, behind what flags if any), "intent emailed" (mailing list URL), or "considering" (citation).<br />
''web-platform-tests'': Please link to the test suite. If any part of the feature is not tested by web-platform-tests, or if you had to write gecko-only tests for parts of the feature, please include links to one or more of:
* A web-platform-tests issue explaining why a certain thing cannot be tested ([https://github.com/w3c/web-platform-tests/issues/3867 example]).
* A spec issue for some change that would make it possible to test ([https://github.com/whatwg/fullscreen/issues/70 example]).