[css-flexbox] Move negative-flex-rounding-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-rounding-crash.html.
Bug: 1063749
Change-Id: Ia5e1488b0f7681ffebf726300977e406cf58dcb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142877
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@{#758490}
diff --git a/css/css-flexbox/negative-flex-rounding-crash.html b/css/css-flexbox/negative-flex-rounding-crash.html
new file mode 100644
index 0000000..ad69cc0
--- /dev/null
+++ b/css/css-flexbox/negative-flex-rounding-crash.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>CSS Flexbox: Crash caused by rounding error in flex-shrink</title>
+<link rel="author" title="Tony Chang" href="mailto:tony@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#resolve-flexible-lengths">
+<link rel="issue" href="https://bugs.webkit.org/show_bug.cgi?id=97606">
+<meta name="assert" content="Check that crash doesn't happen in flex-shrink due to floating point precision errors.">
+
+<style>
+.math {
+ display: inline-flex;
+}
+.math > * {
+ padding-bottom: 0.35em;
+}
+.mfrac {
+ display: inline-flex;
+ flex-direction: column;
+}
+.mfrac > :first-child {
+ margin-block-end: 0.2em;
+}
+.mfrac > :last-child {
+ margin-block-start: 0.2em;
+}
+.x {
+ line-height: 9px;
+}
+.y {
+ line-height: 12px;
+}
+</style>
+<div class=math>
+ <div class=mfrac>
+ <div class=mfrac>
+ <div class=x>x</div>
+ <div class=y>y</div>
+ </div>
+ <div class=mfrac>
+ <div class=mfrac>
+ <div class=x>x</div>
+ <div class=y>y</div>
+ </div>
+ <div class=x>z</div>
+ </div>
+ </div>
+</div>
