[Webkit-unassigned] [Bug 191002] At least two dozen IntersectionObserver tests are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191002

--- Comment #3 from Michael Catanzaro <mcatanzaro at igalia.com> ---
Here's an example failure that occurred after r237218:

https://build.webkit.org/results/Apple%20High%20Sierra%20Debug%20WK2%20(Tests)/r237322%20(5225)/results.html

--- /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/intersection-observer/containing-block-expected.txt
+++ /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/intersection-observer/containing-block-actual.txt
@@ -1,7 +1,7 @@

 PASS IntersectionObserver should only report intersections if root is a containing block ancestor of target. 
-PASS In containing block and intersecting. 
-PASS In containing block and not intersecting. 
-PASS Not in containing block and intersecting. 
-PASS Not in containing block and not intersecting. 
+FAIL In containing block and intersecting. assert_equals: entries.length expected 1 but got 0
+FAIL In containing block and not intersecting. assert_equals: entries.length expected 2 but got 1
+FAIL Not in containing block and intersecting. assert_equals: entries.length expected 2 but got 1
+FAIL Not in containing block and not intersecting. assert_equals: entries.length expected 2 but got 1

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