YouTube seems to build massive display lists. Some item counts from the example display list dump: Gecko 1766 nsDisplayCompositorHitTestInfo 257 nsDisplayText 241 nsDisplayOpacity 146 nsDisplayTransform 105 nsDisplaySVGWrapper 87 nsDisplayBackgroundColor 68 nsDisplayBorder 39 nsDisplayButtonBorder 26 nsDisplayImage WR 886 ClipChain(ClipChainItem) 776 HitTest(HitTestDisplayItem) 393 PushStackingContext(PushStackingContextDisplayItem) 393 PopStackingContext 228 Clip(ClipDisplayItem) 97 PushReferenceFrame(ReferenceFrameDisplayListItem 97 PopReferenceFrame 92 Rectangle(RectangleDisplayItem) 92 Image(ImageDisplayItem) 70 Border(BorderDisplayItem)
Bug 1710978 Comment 3 Edit History
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YouTube seems to build massive display lists. I wrote some code to dump display item distribution of a display list.