On Windows, if a <select> menu does not contain enough options to require a scrollbar, clicking the <select> again without moving the cursor does not dismiss the menu. Clicking in another part of the <select> does dismiss menu as expected. This is easier to reproduce if you have a laptop and trackpad. I'm marking this as PlatformOnly for now, but this may affect any ports that use drop-down style menus and not popup menus like OS X.
Created attachment 16710 [details] Testcase