mozilla-central/testing/web-platform/tests/css/css-values/calc-unit-analysis.html

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<!DOCTYPE HTML>
<html>
<head>
<title>CSS Variables Allowed Syntax</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
<link rel="help" href="http://www.w3.org/TR/css3-values/#lengths" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="style"></style>
</head>
<body>
<div id=log></div>
<div id="test"></div>
<script>
function run() {
var test_elt = document.getElementById("test");
var test_cs = window.getComputedStyle(test_elt, "");
function description_to_name(description) {
return description.replace(/\W+/g, "_").replace(/^_/, "").replace(/_$/, "");
}
function assert_invalid_value(property, value, description) {
test(function() {
test_elt.style.setProperty(property, "inherit");
test_elt.style.setProperty(property, value);
assert_equals(test_elt.style.getPropertyValue(property),
"inherit");
test_elt.style.setProperty(property, value);
test_elt.style.removeProperty(property);
},
description_to_name(description));
}
function assert_valid_value(property, value, computes_to, description) {
test(function() {
test_elt.style.setProperty(property, "inherit");
test_elt.style.setProperty(property, value);
assert_not_equals(test_elt.style.getPropertyValue(property),
"inherit");
assert_equals(test_cs.getPropertyValue(property),
computes_to);
test_elt.style.removeProperty(property);
},
description_to_name(description));
}
assert_invalid_value("margin-left", "calc(0)", // invalid calc expression
"unitless zero in calc() is a numeric type, not length");
assert_valid_value("margin-left", "calc(0px)", "0px",
"0px in calc()");
assert_invalid_value("margin-left", "calc(1px + 2)", // invalid calc expression
"addition of length and number");
assert_invalid_value("margin-left", "calc(2 + 1px)", // invalid calc expression
"addition of number and length");
assert_invalid_value("margin-left", "calc(1px - 2)", // invalid calc expression
"subtraction of length and number");
assert_invalid_value("margin-left", "calc(2 - 1px)", // invalid calc expression
"subtraction of number and length");
assert_valid_value("margin-left", "calc(2px * 2)", "4px",
"multiplication of length and number");
assert_valid_value("margin-left", "calc(2 * 2px)", "4px",
"multiplication of number and length");
assert_invalid_value("margin-left", "calc(2px * 1px)", // invalid calc expression
"multiplication of length and length");
assert_invalid_value("margin-left", "calc(20 / 0.75rem)", // invalid calc expression
"division by non-number");
}
run();
</script>
</body>
</html>