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

<!DOCTYPE HTML>
<div id="dummy"></div>
<div id="results">This tests parse time simplification in calc()<br><br></div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

var tests = [
    "100px * (25 + 5)",
    "100em * (25 - 5)",
    "100ex * (2 * 5 - 5)",
    "100cm * (5 - 4 / 5)",
    "100mm * (2.4 * 5 - 8 / 5)",
    "100in * (6 * (5 - 4) / 8)",
    "1px * (3 + 1/(7 + 1/(15 + 1/(1 + 1/(292 + 1/(1 + 1/(1 + 1/(1 + 1))))))))",
    "100pc * 20 + 100rem * 10 - 100ch * 5 + 100pc",
    "((100px + 20 * 5px) * 10 - 5 * (10em * 5 + 10em)) * 2",
    "100px + 1in",
    "10 * 10px + 0.5 * 2in",
    "100px + 1in + 10%",
    "100px - 1in",
    "50cm + 50cm",
    "50cm + 10in + 100mm",
    "100px + 1em",
    "100px + 1em + 100px",
    "1em + 1rem",
    "1q + 10q",
    "100q * (10 + 5)",
];

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 + ')';
    results.innerHTML += expression + " => " + dummy.style.width + "<br>";
}
</script>