Bug 1343139 - Part 3. crash test.
MozReview-Commit-ID: 8mkpTm3q0tl
new file mode 100644
--- /dev/null
+++ b/layout/base/crashtests/1343139-1.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+setTimeout(function(){ window.close(); }, 500);
+window.onload = function(){
+ let o0 = document.createElement("span"),
+ o1 = document.createElement("div");
+ document.documentElement.appendChild(o0);
+ o0.appendChild(o1);
+ o0.animate([{"filter": "invert(96%)"}], 100);
+ o1.animate([{"mask": "linear-gradient(red,blue)", "transform": "none"}], 100);
+};
+</script>
+</head>
+</html>
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -484,8 +484,9 @@ load 1288946-2a.html
load 1288946-2b.html
load 1297835.html
load 1299736-1.html
load 1308793.svg
load 1308848-1.html
load 1308848-2.html
load 1338772-1.html
asserts(0-1) load 1343606.html # bug 1343948
+skip-if(stylo) pref(dom.animations-api.core.enabled,true) load 1343139-1.html # bug 1311257
