This behavior has hit me many times because on a laptop accidentally touching the trackpad can lose focus from a text field very easily, so while I am typing a

This behavior has hit me many times because on a laptop accidentally touching the trackpad can lose focus from a text field very easily, so while I am typing a comment/whatever if my thumb or palm drops a bit to touch the trackpad just before I hit the delete key, the browser is suddenly making me angry. Even if no text is lost, focus on doing whatever I was doing is lost.