[Webkit-unassigned] [Bug 192214] New: [LFC][BFC][MarginCollapsing] Do not use computed display box values for border and padding

Thu Nov 29 21:11:32 PST 2018

https://bugs.webkit.org/show_bug.cgi?id=192214

            Bug ID: 192214
           Summary: [LFC][BFC][MarginCollapsing] Do not use computed
                    display box values for border and padding
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

they are not computed yet when we are trying to estimate margin top values. try to survive with the non-computed values.

<body><div style="float: left"></div><div><div style="margin-top: 10px">foobar</div></div>
when the floating box is placed, we need to know its final vertical position. We estimate margin tops all the way to the formatting context root. To computer margin-top for the <body>, we actually have to know if that nested div's margin gets collapsed all the way up. To find it out we need to know padding and border values. Unfortunately at the time when the float is placed we don't yet have that information.

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