chromium/third_party/blink/web_tests/editing/pasteboard/styled-element-markup.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// This tests copy/paste of styled elements, like images. The image in the
// region below should be centered after its copied and pasted.
selection_test(
    [
        '<div>^<center><img></center>|</div>',
        '<div contenteditable id="target"></div>',
    ],
    selection => {
        selection.document.execCommand('Copy');
        selection.collapse(selection.document.getElementById('target'), 0);
        selection.document.execCommand('Paste');
    },
    [
        '<div><center><img></center></div>',
        '<div contenteditable id="target">',
            '<img style="text-align: -webkit-center;">|',
        '</div>',
    ]);
</script>