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What does `headless` really mean? Test runs in CI are supposed to be headless, right? So, how do they generate screenshots and video? Does "headless" simply mean "we didn't send this output to a monitor"? I assumed that it meant "we didn't even require the GPU to render the DOM" but that clearly isn't true if we have media artifacts. (Jerry Seinfeld voice) What's the deal with headless mode?