[css-flexbox] Fix under-invalidation with fieldset.
This was the classic - use an invalid intrinsic block-size for cache
logic.
Bug: 1270850
Change-Id: Id02cd79b1832ac8f0de0085444fdd8fea6dba5db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3373726
Reviewed-by: David Grogan <dgrogan@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/main@{#956766}
diff --git a/css/css-flexbox/fieldset-as-item-dynamic.html b/css/css-flexbox/fieldset-as-item-dynamic.html
new file mode 100644
index 0000000..814b228
--- /dev/null
+++ b/css/css-flexbox/fieldset-as-item-dynamic.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<p>Test passes if there is a filled green square.</p>
+<div id="target" style="display: flex; width: 100px; height: 0; background: green;">
+ <fieldset style="border: none; padding: 0;">
+ <div style="height: 100px;"></div>
+ </fieldset>
+</div>
+<script>
+document.body.offsetTop;
+document.getElementById('target').style.height = 'auto';
+</script>
