Bug 1575407 [wpt PR 18573] - [css-flexbox] Only clear the override size if we're doing layout, a=testonly

cbiesinger · moz-wptsync-bot · commit 42254ec70780 · 2019-08-27T04:12:24.000Z
Automatic update from web-platform-tests [css-flexbox] Only clear the override size if we're doing layout And make ChildUnstretchedLogical{Width,Height} handle the case where an override size is set (by clearing and re-setting). The problem with clearing the override size, but not doing layout, is that we may later do a simplified layout which will then lay out as shrink-to-fit, which is undesired. Bug: 992010 Change-Id: I18d3ae66f62cbdc9cdcf76810dc0eff6be915af6 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758940 Commit-Queue: Christian Biesinger <cbiesinger@chromium.org> Auto-Submit: Christian Biesinger <cbiesinger@chromium.org> Reviewed-by: David Grogan <dgrogan@chromium.org> Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Reviewed-by: Emil A Eklund <eae@chromium.org> Cr-Commit-Position: refs/heads/master@{#689485} -- wpt-commits: 768d6294ed324158d4269a833fda94ea7927efe3 wpt-pr: 18573
diff --git a/testing/web-platform/tests/css/css-flexbox/dynamic-change-simplified-layout.html b/testing/web-platform/tests/css/css-flexbox/dynamic-change-simplified-layout.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht" />
+<link rel="author" title="Google LLC" href="http://www.google.com" />
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#cross-sizing" />
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=992010" />
+<title>Tests that certain dynamic changes don't lead to a flex item being sized as shrink to fit when it should stretch in the cross axis</title>
+
+<style>
+#flex {
+  display: flex;
+  flex-direction: column;
+  flex-wrap: wrap;
+  position: absolute;
+  top: 20px;
+  width: 100px;
+}
+
+#it1 {
+  background: green;
+  flex: none;
+  height: 100px;
+  min-height: 0;
+  position: relative;
+}
+
+#child {
+  position: absolute;
+  top: 0;
+  left: 0;
+}
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div style="position: relative;">
+  <div id="flex">
+    <div id="it1" style=""><div id="child"></div></div>
+    <div id="it2"></div>
+  </div>
+</div>
+
+<script>
+var flex = document.getElementById("flex");
+flex.offsetWidth;
+var it2 = document.getElementById("it2");
+it2.style.width = "50px";
+flex.offsetWidth;
+flex.style.top = "0px";
+var child = document.getElementById("child");
+child.style.top = "1px";
+flex.offsetWidth;
+</script>
