[Webkit-unassigned] [Bug 262269] New: ASSERTION FAILED: m_hasValidTop && (m_hasPrecomputedMarginBefore || m_hasValidVerticalMargin)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262269

            Bug ID: 262269
           Summary: ASSERTION FAILED: m_hasValidTop &&
                    (m_hasPrecomputedMarginBefore ||
                    m_hasValidVerticalMargin)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 1319794503 at qq.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 467942

  --> https://bugs.webkit.org/attachment.cgi?id=467942&action=review

testcase to trigger the crash

ASSERTION FAILED: m_hasValidTop && (m_hasPrecomputedMarginBefore || m_hasValidVerticalMargin)
/app/webkit/Source/WebCore/layout/layouttree/LayoutBoxGeometry.h(208) : WebCore::LayoutUnit WebCore::Layout::BoxGeometry::logicalTop() const

The minimized testcase will be uploaded as soon as possible.

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