A column-spanning legend isn't part of the flow thread.

The containing block of a spanner is always the multicol container itself. Bug: 1123710, 1123792 Change-Id: I3486e6ad2484396548f8682c842a6fb8a731e058 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386799 Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org> Commit-Queue: Morten Stenshorne <mstensho@chromium.org> Cr-Commit-Position: refs/heads/master@{#803609}
web-platform-tests · Sep 1, 2020 · 43847c6 · 43847c6
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diff --git a/css/css-multicol/spanning-legend-000-crash.html b/css/css-multicol/spanning-legend-000-crash.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1123710">
+<div style="columns:2;">
+  <legend style="column-span:all; columns:2;">
+    <div></div>
+  </legend>
+</div>
diff --git a/css/css-multicol/spanning-legend-001-crash.html b/css/css-multicol/spanning-legend-001-crash.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1123792">
+<div style="columns:2;">
+  <legend id="legend" style="column-span:all;"></legend>
+</div>
+<script>
+  legend.getBoundingClientRect();
+</script>