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See attached image. The blue lines only appears on fresh reload of the page, after a mouse click, it goes away, but it reappears if the page is reloaded.
It is not part of the video since it goes away after mouse click, and it also appears on all other videos I’ve tested. It looks like if the video is selected and highlighted in the browser, and with a mouse click, it deselects and the highlight goes away. Any ideas?