Oh, this orange detects actual inconsistent behavior at load event. When it's green, `HTMLEditor` has already been created for contenteditable. Then, `Selection::Collapse()` is performed and `HTMLEditor::BegginingOfDocument()` is not called at turning `designMode` on because [editing state was not off](https://searchfox.org/mozilla-central/rev/7e92a667e3829831c31e8d46aefe7ef67ad5be1c/dom/base/Document.cpp#5438). However when it's orange, there is no selection ranges because `contenteditable` has not been handled yet.
Bug 1601585 Comment 12 Edit History
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Oh, this orange detects actual inconsistent behavior at load event. When it's green, `HTMLEditor` has already been created for contenteditable. Then, `Selection::Collapse()` is performed and `HTMLEditor::BegginingOfDocument()` is not called at turning `designMode` on because [editing state was not off](https://searchfox.org/mozilla-central/rev/7e92a667e3829831c31e8d46aefe7ef67ad5be1c/dom/base/Document.cpp#5438). However when it's orange, there is no selection ranges because `contenteditable` has not been handled yet (i.e., the editing state is still off at setting `designMode` to `on`).