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<!DOCTYPE html>
<p>The rules below should be green, and there should be no assertion failures.</p>
<p>Click to test if testing manually.</p>
<div id="mc" style="-webkit-columns:3; line-height:100px; -webkit-column-rule:solid yellow;">
    <br>
    <br>
    <br>
</div>
<script>
    if (window.testRunner)
        testRunner.waitUntilDone();
    function changeStyle() {
        document.getElementById('mc').style.webkitColumnRuleColor = 'green';
        if (window.testRunner)
            testRunner.notifyDone();
    }
    onclick = changeStyle; // for testing manually.
    onload = function() {
        // Force painting, then change style, which in turn will trigger another repaint.
        if (window.testRunner)
            testRunner.layoutAndPaintAsyncThen(changeStyle);
    }
</script>