Ajaxian: MozAfterPaint: Being able to get a callback event on repaint

John Resig put together a nice usage of MozAfterPaint , the new Firefox event that will call back letting you know when a repaint operation has happened: 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. To test this I created a quick demo using CNN.com (only works in the latest Firefox nightlies ). John creating a simple tracking script that uses the new event to show where you have been. kourge reminded us of the related Flash event showRedrawRegions . Robert O’Callahan mentioned a use for the event when he discussed SVG bling that made it into the first 3.1 beta . David Hyatt put in a WebKit p...