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Test Info:

<script>
onload = function() {
var testContainer = document.createElement("span");
testContainer.contentEditable = true;
document.body.appendChild(testContainer);
function queryFormatBlock(content)
{
testContainer.innerHTML = content;
while (testContainer.firstChild)
testContainer = testContainer.firstChild;
window.getSelection().collapse(testContainer, 0);
document.queryCommandValue('formatBlock');
}
queryFormatBlock('<ol>hello</ol>');
};
</script>