Replaces the current selection with mixed text and markup.
- macOS 10.3+
The markup string that replaces the current selection.
If the current selection is collapsed (a range is selected with the same nodes and offsets for the start and end) then no content is removed when inserting the markup, and the selection is collapsed and moved to the end of the inserted content. If no content is selected, the markup is not inserted.
See HTML Clipboard Format for a specification of the supported HTML markup.