[Webkit-unassigned] [Bug 205168] New: REGRESSION: imported/w3c/web-platform-tests/mathml/presentation-markup/scripts/underover-parameters-3.html is a flakey failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205168

            Bug ID: 205168
           Summary: REGRESSION:
                    imported/w3c/web-platform-tests/mathml/presentation-ma
                    rkup/scripts/underover-parameters-3.html is a flakey
                    failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com

imported/w3c/web-platform-tests/mathml/presentation-markup/scripts/underover-parameters-3.html

This test is a flakey failure on Mac

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmathml%2Fpresentation-markup%2Fscripts%2Funderover-parameters-3.html

Diff:
--- /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/mathml/presentation-markup/scripts/underover-parameters-3-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/mathml/presentation-markup/scripts/underover-parameters-3-actual.txt
@@ -1,10 +1,10 @@

 PASS Baseline alignment 
 PASS Heights of bases 
-PASS AccentBaseHeight, UnderbarExtraDescender 
-PASS AccentBaseHeight, UnderbarVerticalGap 
-PASS AccentBaseHeight, OverbarExtraAscender 
-PASS AccentBaseHeight, OverbarVerticalGap 
+FAIL AccentBaseHeight, UnderbarExtraDescender assert_approx_equals: munderover: accent over short base expected 40 +/- 2 but got 30.5
+FAIL AccentBaseHeight, UnderbarVerticalGap assert_approx_equals: munderover: accent over short base expected 40 +/- 2 but got 30.5
+FAIL AccentBaseHeight, OverbarExtraAscender assert_approx_equals: mover: accent over short base expected 40 +/- 2 but got 30.5
+FAIL AccentBaseHeight, OverbarVerticalGap assert_approx_equals: mover: nonaccent over short base expected 140 +/- 2 but got 31.5


It looks like this test began failing around r252125

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