Re: [w3c/editing] execCommand commands listed in MDN but not in the spec (Issue #530)

masayuki-nakano left a comment (w3c/editing#530)

The full list of commands which are supported Firefox is here:
https://searchfox.org/firefox-main/rev/9a3317a65545e83f4e32b94fdf1f6860342423ef/dom/base/Document.cpp#4903-5272

`contentReadOnly` is disabled by a pref by default:
https://searchfox.org/firefox-main/rev/9a3317a65545e83f4e32b94fdf1f6860342423ef/dom/base/Document.cpp#5321-5323

`decreaseFontSize` and `increaseFontSize` were dropped due to not supported by the other browsers.
https://bugzilla.mozilla.org/show_bug.cgi?id=1706266

`enableAbsolutePositionEditor`, `enableInlineTableEditing` and `enableObjectResizing` were added for web apps which may use the Gecko specific editing UI. So, they are probably not supported by the other browsers. According to the telemetry of the UI usage at considering that, surprisingly some users used the object resizer.

`heading` and `readonly` were also dropped in bug 1706266.

`insertBrOnReturn` was disabled by a pref by default:
https://searchfox.org/firefox-main/rev/9a3317a65545e83f4e32b94fdf1f6860342423ef/dom/base/Document.cpp#5327-5330

`highlightColor` is supported by Firefox. It's an alias of `backColor`.
https://searchfox.org/firefox-main/rev/9a3317a65545e83f4e32b94fdf1f6860342423ef/dom/base/Document.cpp#5032,5034,5037,5040,5042,5045

I don't know `AutoUrlDetect`. I think it has never been supported by Firefox.

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