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This one is tricky because form controls, though I think I got it right... This fixes a pre-existing bug where we're not following the spec for readonly inside content-editable. I filed this as bug 1850390 but other browsers match the spec so add a test and fix it while at it. This allows cheaper checks for readonlyness in a couple places. Differential Revision: https://phabricator.services.mozilla.com/D186896