Bug 209084

Summary:	[ Mac Release ] css3/selectors3/xml/css3-modsel-d4.xml is flaky failing.
Product:	WebKit	Reporter:	Jason Lawrence <Lawrence.j>
Component:	CSS	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Mac
OS:	macOS 10.15

Description Jason Lawrence 2020-03-13 15:12:51 PDT

css3/selectors3/xml/css3-modsel-d4.xml

Description:
This test is flaky failing on Mac. the first flaky failure was appeared on December 17, 2019.

History:
https://results.webkit.org/?suite=layout-tests&test=css3%2Fselectors3%2Fxml%2Fcss3-modsel-d4.xml&platform=mac&style=release&limit=50000

Diff:
--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/css3/selectors3/xml/css3-modsel-d4-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/css3/selectors3/xml/css3-modsel-d4-actual.txt
@@ -4,12 +4,12 @@
   RenderBlock {test} at (0,0) size 800x118
     RenderBlock {div} at (0,16) size 800x86
       RenderBlock {div} at (0,0) size 800x86
-        RenderBlock {p} at (0,0) size 800x18 [bgcolor=#FF0000]
+        RenderBlock {p} at (0,0) size 800x18
+          RenderText {#text} at (0,0) size 289x18
+            text run at (0,0) width 289: "This line should be unstyled. (4 moving to 1)"
+        RenderBlock {p} at (0,34) size 800x18
           RenderText {#text} at (0,0) size 208x18
             text run at (0,0) width 208: "This line should be unstyled. (2)"
-        RenderBlock {p} at (0,34) size 800x18
+        RenderBlock {p} at (0,68) size 800x18 [bgcolor=#00FF00]
           RenderText {#text} at (0,0) size 295x18
             text run at (0,0) width 295: "This line should have a green background. (3)"
-        RenderBlock {p} at (0,68) size 800x18
-          RenderText {#text} at (0,0) size 289x18
-            text run at (0,0) width 289: "This line should be unstyled. (4 moving to 1)"

Comment 1 Radar WebKit Bug Importer 2020-03-13 15:13:12 PDT

<rdar://problem/60435954>

Comment 2 Jason Lawrence 2020-03-13 15:17:27 PDT

I have marked this test as failing while this issue is investigated.
https://trac.webkit.org/changeset/258435/webkit

Comment 3 Jason Lawrence 2020-03-13 15:18:41 PDT

Correction, this is where I marked the test: https://trac.webkit.org/changeset/258437/webkit