[Webkit-unassigned] [Bug 199168] New: An SVG element inside a position: absolute element won't update until a layout change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199168

            Bug ID: 199168
           Summary: An SVG element inside a position: absolute element
                    won't update until a layout change
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timdream at gmail.com
                CC: zimmermann at kde.org

Created attachment 372776

  --> https://bugs.webkit.org/attachment.cgi?id=372776&action=review

test.html

Summary:
A SVG element inside a position: absolute element is misplaced by text-align: center

Steps To Reproduce:
1. Load the test case
2. Observe that the position of the SVG triangle is diffferent even though the DOM+CSS state is exactly the same.
3. Trigger layout by change the window width.
4. Observe that the SVGs on case #2 and #4 is misplaced again.

Notes:
There are two bugs here. 

First, svg is set to display: block in the UA sheet; setting the property to the same value shouldn’t hav any effect but apparently it does. It was also not being placed correctly — the position of a block element inside another block element shouldn’t be affected by the |text-align| property.

Second: unset the “no-op” value should restore the layout but it did not until re-layout.

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