Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/frames/iframe-display-none.html 

<html>
    <head>
        <script>
            function runTest() {
                if (window.testRunner)
                    testRunner.dumpAsText();
                    
                var frame = document.getElementById('theFrame');
                
                if (!frame.contentDocument)
                    return;
                    
                var text = frame.contentDocument.getElementById('text');
                
                if (!text)
                    return;
                    
                if (text.innerText != 'This text comes from the hidden iframe')
                    return;
                
                if (window.frames.length != 1)
                    return;
                    
                if (window.frames[0].document != frame.contentDocument)
                    return;
                    
                document.getElementById('result').innerText = 'SUCCESS';
            }
        </script>
    </head>
    <body onload="runTest()">
        <iframe id="theFrame" style="display:none" src="resources/iframe-display-none-child.html"></iframe>
        This tests that a hidden iframe (with display set to none) can still be accessed using JavaScript.
        <div id="result">SUCCESS</div>
    </body>
</html>