The goal should not be to include something because there is a use case but because the use case so stunningly obvious that this should become part of what every browser must implement.
It is clear this can be done without being part of the standard as is shown by the fact that it is already done. So it has no place in the standard.
It is clear this can be done without being part of the standard as is shown by the fact that it is already done. So it has no place in the standard.