| Index: LayoutTests/fullscreen/rendering/ua-style-iframe-border.html | 
| diff --git a/LayoutTests/fullscreen/rendering/ua-style-iframe-border.html b/LayoutTests/fullscreen/rendering/ua-style-iframe-border.html | 
| new file mode 100644 | 
| index 0000000000000000000000000000000000000000..6ef676a2e70f8ab8f56e9b8a2cfee314c18232e4 | 
| --- /dev/null | 
| +++ b/LayoutTests/fullscreen/rendering/ua-style-iframe-border.html | 
| @@ -0,0 +1,25 @@ | 
| +<!DOCTYPE html> | 
| +<title>Fullscreen UA style sheet removes iframe border</title> | 
| +<script src="../../resources/testharness.js"></script> | 
| +<script src="../../resources/testharnessreport.js"></script> | 
| +<script src="../trusted-event.js"></script> | 
| +<div id="log"></div> | 
| +<iframe></iframe> | 
| +<script> | 
| +async_test(function() | 
| +{ | 
| +    var iframe = document.querySelector("iframe"); | 
| + | 
| +    // The HTML UA style sheet gives iframe a border. | 
| +    // https://html.spec.whatwg.org/#embedded-content-rendering-rules | 
| +    assert_equals(getComputedStyle(iframe).borderStyle, "inset"); | 
| + | 
| +    document.addEventListener("fullscreenchange", this.step_func_done(function() | 
| +    { | 
| +        // The Fullscreen UA style sheet removes the iframe border. | 
| +        assert_equals(getComputedStyle(iframe).borderStyle, "none"); | 
| +    })); | 
| + | 
| +    trusted_request(iframe); | 
| +}); | 
| +</script> | 
|  |