Blink does not prevent <video controls tabindex="-1"> getting focus when using the Tab key. I assume this is because the player controls are provided in a ShadowRoot that does not realize its ShadowHost was removed from the document's tab sequence (by way of `tabindex="-1"`). Focusing the video element by Tab can be avoided by removing the controls attribute, but I assume that has other undesired side effects.

Note that you need to hit Tab several times because the video controls are also in the tab sequence, but you won't *see* them actually having focus.

Also note that the second video element (the one not supposed to get focus), emits a focus event, but does not render the focus outline