diff --git a/layout/style/crashtests/1399546.html b/layout/style/crashtests/1399546.html
new file mode 100644
index 000000000000..883ee9fd656b
--- /dev/null
+++ b/layout/style/crashtests/1399546.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<script>
+var d = document
+var de = d.documentElement
+de.appendChild(d.createElement("x"))
+de.appendChild(d.createElement("x"))
+de.appendChild(d.createElement("x"))
+de.appendChild(d.createElement("body"))
+
+// Should be enough of them in order for styling to be paralelizable.
+for (var i = 0; i < 100; ++i)
+  de.appendChild(d.createElement("x"))
+
+var t = d.createElement("x")
+de.appendChild(t)
+t.appendChild(d.createElement("table"))
+</script>
diff --git a/layout/style/crashtests/crashtests.list b/layout/style/crashtests/crashtests.list
index 1d293ef33a98..dcffb0fffebc 100644
--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@@ -218,3 +218,4 @@ load 1395719.html
 load 1397091.html
 load 1398479.html
 load 1398581.html
+load 1399546.html
