<!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/css-variables-1/#defining-variables">
  <meta name="assert" content='The <value> type used in the syntax above is defined as anything matching the "value" production in CSS 2.1 Chapter 4.1 [CSS21].'>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
<style id="style"></style>
</head>
<body onload="run()">
<div id=log></div>
<div id="test"></div>
<script>
setup({ "explicit_done": true });

function run() {
  // Setup the iframe
  var style = document.getElementById("style");
  var styleText = document.createTextNode("");
  style.appendChild(styleText);
  var test_cs = window.getComputedStyle(document.getElementById("test"), "");

  var initial_cs = test_cs.backgroundColor;
  styleText.data = "#test { background-color: green }";
  var green_cs = test_cs.backgroundColor;
  styleText.data = "#test { background-color: red }";
  var red_cs = test_cs.backgroundColor;

  function description_to_name(description) {
    return description.replace(/\W+/g, "_").replace(/^_/, "").replace(/_$/, "");
  }

  function assert_allowed_variable_value(value, description) {
    test(function() {
           styleText.data = "#test { \n" +
                            "  --test: red;\n" +
                            "  --test: " + value + ";\n" +
                            "  background-color: red;\n" +
                            "  background-color: var(--test);\n" +
                            "}";
           assert_not_equals(initial_cs, red_cs);
           assert_equals(initial_cs, test_cs.backgroundColor);
         },
         description_to_name(description));
  }

  function assert_disallowed_balanced_variable_value(value, description) {
    test(function() {
           styleText.data = "#test { \n" +
                            "  --test: green;\n" +
                            "  --test: " + value + ";\n" +
                            "  background-color: red;\n" +
                            "  background-color: var(--test);\n" +
                            "}";
           assert_not_equals(green_cs, red_cs);
           assert_equals(green_cs, test_cs.backgroundColor);
         },
         description_to_name(description));
  }

  assert_allowed_variable_value("25%", "percentage");
  assert_allowed_variable_value("37", "number");
  assert_allowed_variable_value("12em", "length");
  assert_allowed_variable_value("75ms", "time");
  assert_allowed_variable_value("foo()", "function");
  assert_allowed_variable_value("foo(bar())", "nested function");
  assert_allowed_variable_value("( )", "parentheses");
  assert_allowed_variable_value("{ }", "braces");
  assert_allowed_variable_value("[ ]", "brackets");
  assert_allowed_variable_value("@foobar", "at-keyword (unknown)");
  assert_allowed_variable_value("@media", "at-keyword (known)");
  assert_allowed_variable_value("@foobar {}", "at-keyword (unknown) and block");
  assert_allowed_variable_value("@media {}", "at-keyword (known) and block");
  assert_disallowed_balanced_variable_value("]", "unbalanced close bracket at toplevel");
  assert_disallowed_balanced_variable_value(")", "unbalanced close paren at toplevel");
  assert_disallowed_balanced_variable_value("(])", "unbalanced close bracket in something balanced");
  assert_disallowed_balanced_variable_value("[)]", "unbalanced close paren in something balanced");
  assert_disallowed_balanced_variable_value("(})", "unbalanced close brace in something balanced");
  assert_allowed_variable_value("<!--", "CDO at top level");
  assert_allowed_variable_value("-->", "CDC at top level");
  assert_allowed_variable_value("(;)", "semicolon not at top level (value -> unused)");
  assert_allowed_variable_value("(<!--)", "CDO not at top level (value -> unused)");
  assert_allowed_variable_value("(-->)", "CDC not at top level (value -> unused)");

  done();
}

</script>
</body>
</html>
