[Webkit-unassigned] [Bug 262281] New: ASSERTION FAILED: is<Target>(source) /app/webkit/WebKitBuild/Debug/WTF/Headers/wtf/TypeCasts.h(79)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262281

            Bug ID: 262281
           Summary: ASSERTION FAILED: is<Target>(source)
                    /app/webkit/WebKitBuild/Debug/WTF/Headers/wtf/TypeCast
                    s.h(79)
           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 467954

  --> https://bugs.webkit.org/attachment.cgi?id=467954&action=review

testcase to trigger the crash

ASSERTION FAILED: is<Target>(source)
/app/webkit/WebKitBuild/Debug/WTF/Headers/wtf/TypeCasts.h(79) : WTF::match_constness_t<Source, Target>& WTF::downcast(Source&) [with Target = WebCore::CSSValueList; Source = WebCore::CSSValue; match_constness_t<Source, Target> = WebCore::CSSValueList]

The minimized testcase will be uploaded as soon as possible.

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