Making a focused element invisible should make it blur.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
===> Setting display:none
Event: blur
PASS document.activeElement is document.body
PASS The focusTarget element lost focus.
===> Setting visibility:hidden
Event: blur
PASS document.activeElement is document.body
PASS The focusTarget element lost focus.
PASS successfullyParsed is true
TEST COMPLETE