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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Basic User Interface Test: interpolable outline-* properties animation</title>
+<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net">
+<link rel="help" href="https://drafts.csswg.org/css-ui-3/#propdef-outline-style">
+<link rel="help" href="https://www.w3.org/TR/web-animations-1/#dom-animatable-animate">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+@keyframes outline-anim {
+  from {
+    outline: solid 1px rgba(1, 0, 0, 0.5);
+    outline-offset: 1px;
+  }
+  to {
+    outline: solid 3px rgba(3, 0, 0, 0.5);
+    outline-offset: 3px;
+  }
+}
+
+#test {
+  animation: outline-anim 3s -1.5s paused linear;
+  outline: solid 1px rgba(1, 0, 0, 0.5);
+  outline-offset: 1px;
+}
+</style>
+<body>
+  <div id="test"></div>
+  <div id=log></div>
+
+  <script>
+    // outline being a render-only property, its animation can be done off the main thread
+    // checking the values after the first paint is safer, hence requestAnimationFrame
+    setup({explicit_done:true});
+    requestAnimationFrame(function() {
+        // synchronous tests being run during the page's first paint
+        test(
+          function(){
+            var test = document.getElementById("test");
+            assert_equals(getComputedStyle(test).outlineColor, 'rgba(2, 0, 0, 0.5)');
+          }, "outline-color is animated as a color");
+        test(
+          function(){
+            var test = document.getElementById("test");
+            assert_equals(getComputedStyle(test).outlineWidth, '2px');
+          }, "outline-width is animated as a length");
+        test(
+          function(){
+            var test = document.getElementById("test");
+            assert_equals(getComputedStyle(test).outlineOffset, '2px');
+          }, "outline-offset is animated as a length");
+        done();
+    });
+</script>
+</body>