Bug 1560890 [wpt PR 17391] - [LayoutNG] Fix inserting exclusion crash., a=testonly

Automatic update from web-platform-tests [LayoutNG] Fix inserting exclusion crash. When placing a new area into the closed area list there is almost always an area at LayoutUnit::Min(). However if there was a float placed at LayoutUnit::Min() it is possible to get into a state where this isn't the case. Bug: 972904 Change-Id: I1c787ea8e4f5d87ae97023efd9cdb994c2b065ce Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1664930 Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org> Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Cr-Commit-Position: refs/heads/master@{#670726} -- wpt-commits: 9a183439c7fd1a22298c49a86be1e293d460ea75 wpt-pr: 17391
2019-07-19 12:36:56 +00:00 · 2019-07-19 12:36:56 +00:00 · 85c7faa169
--- a/testing/web-platform/tests/css/CSS2/floats/floats-saturated-position-crash.html
+++ b/testing/web-platform/tests/css/CSS2/floats/floats-saturated-position-crash.html
@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/972904">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div style="margin-top:-100000000px;">
+  <div style="margin-bottom:-100000000px; padding-top: 1px;"></div>
+  text <!-- "text" is placed at the highest possible location due to saturated margin top values. -->
+  <div style="float: left; width: 60px; height: 20px;"></div>
+  <div style="margin-top: 10px;">
+    <div style="float: left; width: 10px;"></div>
+    <div style="float: left; width: 100px; height: 100px;"></div>
+  </div>
+</div>
+
+<script>
+test(() => { }, 'test passes if it does not crash');
+</script>