focus target=<INPUT id="a"> bubbles=false composed=true focusin target=<INPUT id="a"> bubbles=true composed=true blur target=<INPUT id="a"> bubbles=false composed=true focusout target=<INPUT id="a"> bubbles=true composed=true focus target=<INPUT id="b"> bubbles=false composed=true focusin target=<INPUT id="b"> bubbles=true composed=true