Is it possible to undo the review in ankiweb?

As the title says, is it possible to undo the review in ankiweb.net if for example I press two times the spacebar for error?
If not, would it be possible to add this function?

If the save button is not greyed out, you can refresh the page to undo the last few reviews. A dedicated option may come at one point.

ok, thank you very much