diff --git a/layout/base/crashtests/1729581.html b/layout/base/crashtests/1729581.html
new file mode 100644
index 000000000000..0598f2c1a811
--- /dev/null
+++ b/layout/base/crashtests/1729581.html
@@ -0,0 +1,12 @@
+<style>
+* {
+  clip-path: polygon(1px 1px, 1px -1px, 0px 1px);
+}
+.a {
+  position: fixed;
+  -webkit-transform: translatez(0);
+  opacity: 0;
+}
+</style>
+<hr class="a">Z.Vlz|D&lt;|&#x27;mFZ&lt;M</hr>
+
diff --git a/layout/base/crashtests/crashtests.list b/layout/base/crashtests/crashtests.list
index 3b031b4469d3..785a935205c1 100644
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -561,3 +561,4 @@ load 1689912.html
 load 1690163.html
 load 1723200.html
 load 1729578.html
+load 1729581.html