`Document.execCommand()` may cause firing DOM events and/or running some
observers. Therefore, web apps can call it recursively. However,
Chromium has already stopped supporting it:
https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/core/editing/commands/document_exec_command.cc;l=75;drc=301e5d079a1b4c29c5b17574d0470e6db7370acc
And it'll be documented in execCommand spec:
https://github.com/w3c/editing/issues/200#issuecomment-578097441
So, before that, we should stop supporting nested calls in Nightly
channel and early Beta, and watch bug reports of broken web apps.
Pref name: dom.document.exec_command.nested_calls_allowed
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1611374
--
Masayuki Nakano <masay...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko
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