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A cool new browser event just recently landed in the latest Firefox nightlies: an event announcing when the browser re-draws a portion of the page.

This particular event, called MozAfterPaint fires whenever something is drawn to the screen.

The event object contains two properties: .clientRects and .boundingClientRect, both of which refer to the result of the associated DOM methods.

In a nutshell, boundingClientRect gives you a single rectangle encompassing the entire area in which a paint operation could've taken place whereas clientRects gives you a number of rectangles, each encompassing an individual area that was drawn.



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