[Webkit-unassigned] [Bug 183106] New: css env(safe-area-inset-top) or contant(safe-area-inset-top) value doesn't exist at first

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183106

            Bug ID: 183106
           Summary: css env(safe-area-inset-top) or
                    contant(safe-area-inset-top) value doesn't exist at
                    first
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yuxian.lxy at alibaba-inc.com

Created attachment 334572

  --> https://bugs.webkit.org/attachment.cgi?id=334572&action=review

demo  video

please watch the follow video, u can see the css env(safe-area-inset-top) or contant(safe-area-inset-top) value doesn't exist at first, u can see the red area was getting higher slowly

  demo page : https://pages.tmall.com/wow/chaoshi/act/sa-test

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