When a list element has non-empty list item element, even if the list element is selected, deleting operation should make the list element empty first (i.e., making the list element has only one empty list item element). Then, another deleting operation/command can delete it completely. This is Blink compat behavior in most cases except when the list has non-editable list item element as first and/or last child of it. Note that the new failures of the browserscpe are not compatible with the new behavior, that is, it wants a list element is deleted when the last list item is deleted. https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/editor/libeditor/tests/browserscope/lib/richtext2/richtext2/tests/delete.py#161-164 https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/editor/libeditor/tests/browserscope/lib/richtext2/richtext2/tests/forwarddelete.py#146-149 Here is same test in the WPT: https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/testing/web-platform/tests/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html#386-402 And only Gecko failed in this case: https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/testing/web-platform/meta/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html.ini#1449-1450 https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/testing/web-platform/meta/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html.ini#1937-1938 https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/testing/web-platform/meta/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html.ini#425-426 https://searchfox.org/mozilla-central/rev/08c493902519265d570250c8e7ce575c8cd6f5b5/testing/web-platform/meta/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html.ini#787-788 https://wpt.fyi/results/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html%3FDelete,ol?run_id=5734231113203712&run_id=6263979761467392&run_id=5750388243300352&run_id=5090688355008512 https://wpt.fyi/results/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html%3FDelete,ul?run_id=5734231113203712&run_id=6263979761467392&run_id=5750388243300352&run_id=5090688355008512 https://wpt.fyi/results/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html%3FBackspace,ol?run_id=5734231113203712&run_id=6263979761467392&run_id=5750388243300352&run_id=5090688355008512 https://wpt.fyi/results/input-events/input-events-get-target-ranges-deleting-in-list-items.tentative.html%3FBackspace,ul?run_id=5734231113203712&run_id=6263979761467392&run_id=5750388243300352&run_id=5090688355008512 Therefore, the new failures are expected result. Depends on D125029 Differential Revision: https://phabricator.services.mozilla.com/D125030
