[css-flexbox] Move negative-margins-assert.html to WPT

This CL migrates this test out of third_party/blink/web_tests/css3/flexbox and into the WPT-specific directory, adding links to the relevant specs and a test assertion describing its purpose and renames it to negative-flex-margins-crash.html. Bug: 1063749 Change-Id: Ibd2006646b62247ec4b0fd77165b7bb5fc058040 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144801 Reviewed-by: David Grogan <dgrogan@chromium.org> Reviewed-by: Robert Ma <robertma@chromium.org> Commit-Queue: Miyoung Shin <myid.shin@igalia.com> Cr-Commit-Position: refs/heads/master@{#758491}
web-platform-tests · Apr 13, 2020 · 5f23150 · 5f23150
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commit 5f23150
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/css/css-flexbox/negative-flex-margins-crash.html b/css/css-flexbox/negative-flex-margins-crash.html
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+<!DOCTYPE html>
+<title>CSS Flexbox: Crash caused by negative width in flex box</title>
+<link rel="author" title="Christian Biesinger" href="mailto:cbiesinger@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#box-model">
+<link rel="issue" href="https://crbug.com/490423">
+<meta name="assert" content="Check that crash doesn't happen in flex box with negative margin.">
+
+<style>
+div {
+  display: flex;
+}
+
+.inner {
+  margin-left: -4em;
+}
+</style>
+<div>
+    <div>
+        <div class="inner">PASS if we don't assert</div>
+    </div>
+</div>