<!DOCTYPE html>
<script>
onload = function() {
    if (window.testRunner)
        testRunner.dumpAsText();
    document.designMode = 'on';
    document.execCommand('SelectAll');
    document.execCommand('FormatBlock', false, '<pre>');
    document.write('Pass if test does not crash.\nPASS.');
};
</script>
Text

<style>
   div {
        height: 100px;
    }
</style>
<div></div>
<div></div>