chromium/third_party/blink/web_tests/editing/pasteboard/copy-standalone-image.html

<html> 
<head>
<script>
if (window.testRunner) {
    testRunner.dumpEditingCallbacks();
    testRunner.dumpAsLayoutWithPixelResults();
}

function editingTest() {
    frames['imageframe'].document.execCommand("Copy");
    
    var s = window.getSelection();
    var e = document.getElementById("dest");
    s.collapse(e, 0);
    document.execCommand("Paste");
}
</script>
<style>
.editable { 
    border: 2px solid red; 
    padding: 12px; 
    font-size: 24px; 
}

iframe {
    border: 2px solid blue; 
}
</style>
</head>
<body>

<p>This is an automatic test of copying an image document.</p>
<p>To perform this test manually, click once in the image frame, choose Edit -> Copy
then click in the red box and paste the image. If the image pastes successfully the
test is passed.</p>

<iframe name="imageframe" src="../resources/abe.png" onload="editingTest()">
</iframe>

<div id="dest" class="editable" contenteditable="true"> </div>

</body>
</html>