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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" />
+  <link rel="help" href="http://www.w3.org/TR/css3-values/#calc-type-checking" />
+  <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");
+
+}
+
+run();
+
+</script>
+</body>
+</html>