[Webkit-unassigned] [Bug 207971] New: [ Mac ] css3/selectors3/xml/css3-modsel-d1.xml is flaky failing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207971

            Bug ID: 207971
           Summary: [ Mac ] css3/selectors3/xml/css3-modsel-d1.xml is
                    flaky failing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: XML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Lawrence.j at apple.com

css3/selectors3/xml/css3-modsel-d1.xml

Description:
This test is flaky failing on Mac throughout the visible history, the oldest failure I see is on r251443. The oldest failure that I'm able to recover a diff from is r254746, it's exactly the same.

History:
https://results.webkit.org/?suite=layout-tests&test=css3%2Fselectors3%2Fxml%2Fcss3-modsel-d1.xml&flavor=wk2&flavor=wk1&style=release&style=debug&platform=mac&limit=50000

Diff:
--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/css3/selectors3/xml/css3-modsel-d1-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/css3/selectors3/xml/css3-modsel-d1-actual.txt
@@ -1,9 +1,11 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
-layer at (0,0) size 800x82
-  RenderBlock {test} at (0,0) size 800x82
-    RenderBlock {div} at (0,16) size 800x66
+layer at (0,0) size 800x100
+  RenderBlock {test} at (0,0) size 800x100
+    RenderBlock {div} at (0,16) size 800x84
       RenderBlock {p} at (0,0) size 800x18
         RenderText {#text} at (0,0) size 225x18
           text run at (0,0) width 225: "The following bar should be green."
-      RenderBlock {div} at (0,34) size 800x32 [bgcolor=#FF0000]
+      RenderBlock {div} at (0,34) size 800x50 [bgcolor=#00FF00]
+        RenderText {#text} at (16,16) size 166x18
+          text run at (16,16) width 166: "This line should be green."

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