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The abnormal calculation is from http://dxr.mozilla.org/mozilla-central/source/layout/generic/nsGfxScrollFrame.cpp#460. After ReflowChild, the vis & scroll rect of aMetrics differs from non-oop, which is larger than screen width. So the horizontal scroll bar showed up.
http://dxr.mozilla.org/mozilla-central/source/layout/generic/nsHTMLReflowState.cpp#1463, the size.width of div body is abnormal, but the size is affected by containingBlockWidth.
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