When I go to a video in Safari (Mac) the message that comes has a checkbox (which I asume sets a cookie) and a <span> next to with the the text (mwe-embedplayer-do_not_warn_again) "Dismiss for now."
This should be changed into a <label> instead with the "for" attribute set to the name/id of the checkbox so that clicking the label will toggle the checkbox aswell (pointing the checkbox itself can be tricky at times..(usability)).
Krinkle
Version: unspecified
Severity: enhancement