OptionalonCalled with the edited text when the edit is committed, which is when the editor loses focus. Not called when nothing changed.
OptionalonCalled when the person leaves the editor with Escape, after the commit.
OptionalreadIf true, the text is shown but cannot be edited.
OptionalrefOptionalrunThe CSS for the font properties a run sets.
The text: plain, or formatting runs.
The contract of a rich text editor: text in, edited text out. A host may supply its own in place of the default RichTextEditor.