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-rw-r--r--testing/web-platform/tests/css/css-transitions/crashtests/transition-during-style-attr-mutation.html12
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diff --git a/testing/web-platform/tests/css/css-transitions/crashtests/transition-during-style-attr-mutation.html b/testing/web-platform/tests/css/css-transitions/crashtests/transition-during-style-attr-mutation.html
new file mode 100644
index 0000000000..255794bfa8
--- /dev/null
+++ b/testing/web-platform/tests/css/css-transitions/crashtests/transition-during-style-attr-mutation.html
@@ -0,0 +1,12 @@
+<!DOCTYPE HTML>
+<title>Don't crash when mutating style attribute with non-initial transition</title>
+<link rel="help" href="https://crbug.com/1313554">
+<style>
+ #foo { transition: --unset 1s linear; }
+</style>
+<div id=foo style="background-color:red">PASS if no crash</div>
+<script>
+foo.offsetTop;
+foo.style.backgroundColor = 'green';
+foo.offsetTop;
+</script>