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chromium/third_party/blink/web_tests/css3/calc/cssom.html 

<!DOCTYPE HTML>
<div id="dummy"></div>
<div id="results">This tests calc() and the CSSOM<br><br></div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

var tests = ["10px", 
             "10px + 15px", 
             "100%", 
             "100% - 10px",
             "10px + 10px * 5",
             "5px + 2em + 6in",
             "100% - 10px / 2",
             "1px + 2em - 3rem + 4in",
             "100px * (1 + 2 * 3 - 4 / 5)",
             "(100px) + 200px",
             "((((((((((100px))))))))))",
             "flimstix"];
             
var results = document.getElementById("results");
var dummy = document.getElementById("dummy");
for (var i = 0; i < tests.length; ++i) {
    var expression = tests[i];
    dummy.style.width = 'calc(' + expression + ')';
    dummy.style.width = 'calc(' + expression + ')';
    dummy.style.width = '-moz-calc(' + expression + ')';
    results.innerHTML += expression + " => " + dummy.style.width + "<br>";
}
</script>