How can I find out what caused a paint event in Chrome's timeline frames tab -

when debugging slow paints in chrome's frames tab of timeline tab possible figure out painted , caused paint? paint events seem contain information paint time, dimensions , location.

to keep short - should use combination of show paint rectangles, enable continuous page repainting , timeline view. find show paint rectangles , enable continuous page repainting under rendering tab in drawer.

there more information on google's web fundamentals webpage: simplify paint complexity , reduce paint areas.