chromium/third_party/blink/web_tests/editing/deleting/delete-start-block.html

><progress><script src="../../resources/dump-as-markup.js"></script><script>

if (window.testRunner)
    testRunner.dumpAsText();

document.designMode="on";
document.execCommand("selectall");
document.execCommand("justifycenter",false);
document.body.removeChild(document.body.firstElementChild);
document.execCommand("insertparagraph");

Markup.description("This tests removing the start block. WebKit should not crash.");
Markup.dump(document.body);

</script>