1353222 - CSS transitions applied to 'option' force the :checked styling to stick to the selected option

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[Jared Wein [:jaws] (please needinfo? me)]

STR:
Open the following URI:
data:text/html,<style>option { transition: all .2s; }</style><select><option>1<option>2<option>2<option>2<option>2<option>2
Open the menu
Move your mouse throughout the menu

ER:
The item selected prior to opening the menu should not look selected when hovering over other items

AR:
The item selected prior to opening the menu stays looking selected the whole time the popup is open

Note, this is not a regression from bug 1352963 which adds a transitionend listener.