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You can use the Paint Profiler in Chrome DevTools to replay the "drawing" of your page. When you draw simple elements on screen, the text, border, outline, background, pseudo elements and more are drawn individually. For most of us, it all appears instantaneously and we don't think twice about it. The Paint Profiler allows you to see, step-by-step, exactly how the browser drew your page.
To use it:
You can also expand the draw calls to see more details about how they were invoked.
Update: Manage Network Response Headers is now in Chrome Stable!