<!DOCTYPE html>
This tests transitioning of elements containing a calc expression. The test passes if it does not crash.
<div>
    <div style="width: calc(-100px + 100%);"></div>
</div>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();        
        testRunner.waitUntilDone(); 
    }

    function boom() {
        head = document.getElementsByTagName("head")[0];
        var style = document.createElement("style");
        style.innerHTML=":last-child     {-webkit-transition-duration:.1s;}";
        head.appendChild(style);
        if (window.testRunner) 
            testRunner.notifyDone();
    }

    setTimeout(boom, 10);
</script>