[Webkit-unassigned] [Bug 222952] New: Both the root and the <html> RenderLayers have scrollable areas

Mon Mar 8 16:02:03 PST 2021

https://bugs.webkit.org/show_bug.cgi?id=222952

            Bug ID: 222952
           Summary: Both the root and the <html> RenderLayers have
                    scrollable areas
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

This is the layer tree for about:blank:

layer 0x6edc61420  scrollableArea 0x6edca2780 at (0,0) size 980x876 (composited, bounds=at (0,0) size 980x876, drawsContent=1, paints into ancestor=0)
  RenderView 0x6f15492b0 at (0,0) size 980x876
 positive z-order list (1)
  layer 0x6edc61528  scrollableArea 0x6edca2960 at (0,0) size 980x876
    RenderBlock 0x6f1549760 {HTML} at (0,0) size 980x876
      RenderBody 0x6f1549890 {BODY} at (8,8) size 964x860

Why are there scrollableAreas on the root and the <html>'s layer? The root should be covered by ScrollView, and the <html> should not independently have a scrollable area.

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