Bug 1510489 [wpt PR 14266] - Update wpt metadata, a=testonly

wpt-pr: 14266 wpt-type: metadata
2018-11-28 11:16:38 +00:00 · 2018-11-28 11:16:38 +00:00 · 545ec70b41
--- a/testing/web-platform/meta/intersection-observer/empty-root-margin.html.ini
+++ b/testing/web-platform/meta/intersection-observer/empty-root-margin.html.ini
@ -0,0 +1,4 @@
+[empty-root-margin.html]
+  [An empty rootMargin string is interpreted as a margin of size zero]
+    expected: FAIL
+