Bug 1401256 - Crashtest for animating lengths. r=heycam

MozReview-Commit-ID: HiVfx9cg4ZZ

layout/style/crashtests/1401256.html

@@ -0,0 +1,5 @@
+<script>
+  let o1 = document.createElement('p');
+  document.documentElement.appendChild(o1);
+  o1.animate({'minWidth':['-moz-max-content']});
+</script>

layout/style/crashtests/crashtests.list

@@ -222,3 +222,4 @@ load 1400035.html
 load 1399546.html
 load 1400325.html
 load 1400926.html
+load 1401256.html