new file mode 100644
--- /dev/null
+++ b/layout/style/crashtests/1374175-1.html
@@ -0,0 +1,12 @@
+<style>
+@keyframes anim {
+  from { color: red }
+}
+input {
+  animation: anim 1s;
+}
+</style>
+<script>
+  input=document.createElement('input');
+  document.documentElement.appendChild(input);
+</script>

--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@@ -166,13 +166,14 @@ HTTP load 1320423-1.html
 load 1321357-1.html
 load 1328535-1.html
 load 1331272.html
 HTTP load 1333001-1.html
 pref(dom.animations-api.core.enabled,true) load 1340344.html
 load 1342316-1.html
 load 1356601-1.html
 load 1370793-1.xhtml
+load 1374175-1.html
 load content-only-on-link-before.html
 load content-only-on-visited-before.html
 load 1375812-1.html
 load 1377053-1.html
 load 1377256-1.html