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+<!DOCTYPE HTML>
+<html>
+<!--
+-->
+<head>
+  <title>Test for parsing, storage, and serialization of CSS values</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="property_database.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <style type="text/css" id="prereqsheet">
+  #testnode {}
+  </style>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+<div id="testnode"></div>
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for parsing, storage, and serialization of CSS values **/
+
+/*
+ * The idempotence tests here deserve a little bit of explanation.  What
+ * we're testing here are the following operations:
+ *   parse: string -> CSS rule
+ *   serialize: CSS rule -> string (normalization 1)
+ *     (this actually has two variants that go through partly different
+ *     codepaths, which we exercise with getPropertyValue and cssText)
+ *   compute: CSS rule -> computed style
+ *   cserialize: computed style -> string (normalization 2)
+ *
+ * Both serialize and cserialize do some normalization, so we can't test
+ * for pure round-tripping, and we also can't compare their output since
+ * they could normalize differently.  (We might at some point in the
+ * future want to guarantee that any output of cserialize is
+ * untouched by going through parse+serialize, though.)
+ *
+ * So we test idempotence of parse + serialize by running the whole
+ * operation twice.  Likewise for parse + compute + cserialize.
+ *
+ * Slightly more interestingly, we test that serialize + parse is the
+ * identity transform by comparing the output of parse + compute +
+ * cserialize to the output of parse + serialize + parse + compute +
+ * cserialize.
+ */
+
+var gSystemFont = [
+  "caption",
+  "icon",
+  "menu",
+  "message-box",
+  "small-caption",
+  "status-bar",
+  "-moz-button",
+  "-moz-pull-down-menu",
+  "-moz-list",
+  "-moz-field",
+];
+
+var gBadCompute = {
+  // output wrapped around to positive, in exponential notation
+  "-moz-box-ordinal-group": [ "-1", "-1000" ],
+};
+
+function xfail_compute(property, value)
+{
+  if (property in gBadCompute &&
+      gBadCompute[property].includes(value))
+    return true;
+
+  return false;
+}
+
+// constructed to map longhands ==> list of containing shorthands
+var gPropertyShorthands = {};
+
+var gElement = document.getElementById("testnode");
+var gDeclaration = gElement.style;
+var gComputedStyle = window.getComputedStyle(gElement);
+
+var gPrereqDeclaration =
+  document.getElementById("prereqsheet").sheet.cssRules[0].style;
+
+// On Android, avoid most 'TEST-PASS' logging by overriding
+// SimpleTest.is/isnot, to improve performance
+if (navigator.appVersion.includes("Android")) {
+  is = function is(a, b, name)
+  {
+    var pass = Object.is(a, b);
+    if (!pass)
+      SimpleTest.is(a, b, name);
+  }
+
+  isnot = function isnot(a, b, name)
+  {
+    var pass = !Object.is(a, b);
+    if (!pass)
+      SimpleTest.isnot(a, b, name);
+  }
+}
+
+// Returns true if propA and propB are equivalent, considering aliasing.
+// (i.e. if one is an alias of the other, or if they're both aliases of
+// the same 3rd property)
+function are_properties_aliased(propA, propB)
+{
+  // If either property is an alias, replace it with the property it aliases.
+  if ("alias_for" in gCSSProperties[propA]) {
+    propA = gCSSProperties[propA].alias_for;
+  }
+  if ("alias_for" in gCSSProperties[propB]) {
+    propB = gCSSProperties[propB].alias_for;
+  }
+
+  return propA == propB;
+}
+
+function test_property(property)
+{
+  var info = gCSSProperties[property];
+
+  // can all properties be removed from the style?
+  function test_remove_all_properties(propName, value) {
+    var i, p = [];
+    for (i = 0; i < gDeclaration.length; i++) p.push(gDeclaration[i]);
+    for (i = 0; i < p.length; i++) gDeclaration.removeProperty(p[i]);
+    var errstr = "when setting property " + propName + " to " + value;
+    is(gDeclaration.length, 0, "unremovable properties " + errstr);
+    is(gDeclaration.cssText, "", "non-empty serialization after removing all properties " + errstr);
+  }
+
+  function test_other_shorthands_empty(value, subprop) {
+    if (!(subprop in gPropertyShorthands)) return;
+    var shorthands = gPropertyShorthands[subprop];
+    for (idx in shorthands) {
+      var sh = shorthands[idx];
+      if (are_properties_aliased(sh, property)) {
+        continue;
+      }
+      is(gDeclaration.getPropertyValue(sh), "",
+         "setting '" + value + "' on '" + property + "' (for shorthand '" + sh + "')");
+    }
+  }
+
+  function test_value(value, resolved_value) {
+    var value_has_variable_reference = resolved_value != null;
+    var is_system_font = property == "font" && gSystemFont.includes(value);
+
+    var colon = ": ";
+    gDeclaration.setProperty(property, value, "");
+
+    var idx;
+
+    var step1val = gDeclaration.getPropertyValue(property);
+    var step1vals = [];
+    var step1ser = gDeclaration.cssText;
+    if ("subproperties" in info)
+      for (idx in info.subproperties)
+        step1vals.push(gDeclaration.getPropertyValue(info.subproperties[idx]));
+    var step1comp;
+    var step1comps = [];
+    if (info.type != CSS_TYPE_TRUE_SHORTHAND)
+      step1comp = gComputedStyle.getPropertyValue(property);
+    if ("subproperties" in info)
+      for (idx in info.subproperties)
+        step1comps.push(gComputedStyle.getPropertyValue(info.subproperties[idx]));
+
+    SimpleTest.isnot(step1val, "", "setting '" + value + "' on '" + property + "'");
+    if ("subproperties" in info &&
+        // System font doesn't produce meaningful value for subproperties.
+        !is_system_font)
+      for (idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        if (value_has_variable_reference &&
+            (!info.alias_for || info.type == CSS_TYPE_TRUE_SHORTHAND ||
+            info.type == CSS_TYPE_LEGACY_SHORTHAND)) {
+          is(gDeclaration.getPropertyValue(subprop), "",
+             "setting '" + value + "' on '" + property + "' (for '" + subprop + "')");
+          test_other_shorthands_empty(value, subprop);
+        } else {
+          isnot(gDeclaration.getPropertyValue(subprop), "",
+                "setting '" + value + "' on '" + property + "' (for '" + subprop + "')");
+        }
+      }
+
+    // We don't care particularly about the whitespace or the placement of
+    // semicolons, but for simplicity we'll test the current behavior.
+    var expected_serialization = "";
+    if (step1val != "") {
+      if ("alias_for" in info) {
+        let newValue = info.legacy_mapping && info.legacy_mapping[step1val]
+          ? info.legacy_mapping[step1val] : step1val;
+        // FIXME(emilio): This is a bit unfortunate:
+        // https://github.com/w3c/csswg-drafts/issues/3332
+        if (info.type == CSS_TYPE_LEGACY_SHORTHAND && value_has_variable_reference)
+          newValue = "";
+        expected_serialization = info.alias_for + colon + newValue + ";";
+      } else if (info.type == CSS_TYPE_LEGACY_SHORTHAND) {
+        is(property, "zoom", "Zoom is a bit special because it never " +
+                             "serializes as-is, we always serialize the longhands, " +
+                             "but it doesn't just map to a single property " +
+                             "(and thus we can't use the 'alias_for' mechanism)");
+        let transform = step1val == "1" ? "none" : "scale(" + step1val + ")";
+        let origin = step1val == "1" ? "50% 50% 0px" : "0px 0px 0px";
+        if (value_has_variable_reference) { // See above.
+          transform = "";
+          origin = "";
+        }
+        expected_serialization = "transform" + colon + transform + "; transform-origin" + colon + origin + ";";
+      } else {
+        expected_serialization = property + colon + step1val + ";";
+      }
+    }
+    is(step1ser, expected_serialization,
+       "serialization should match property value");
+
+    gDeclaration.removeProperty(property);
+    gDeclaration.setProperty(property, step1val, "");
+
+    is(gDeclaration.getPropertyValue(property), step1val,
+       "parse+serialize should be idempotent for '" +
+         property + colon + value + "'");
+    if (info.type != CSS_TYPE_TRUE_SHORTHAND) {
+      is(gComputedStyle.getPropertyValue(property), step1comp,
+         "serialize+parse should be identity transform for '" +
+         property + ": " + value + "'");
+    }
+
+    if ("subproperties" in info &&
+        // Using setProperty over subproperties is not sufficient for
+        // system fonts, since the shorthand does more than its parts.
+        !is_system_font &&
+        !value_has_variable_reference) {
+      gDeclaration.removeProperty(property);
+      for (idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        gDeclaration.setProperty(subprop, step1vals[idx], "");
+      }
+
+      // Now that all the subprops are set, check their values.  Note that we
+      // need this in a separate loop, in case parts of the shorthand affect
+      // the computed values of other parts.
+      for (idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        is(gComputedStyle.getPropertyValue(subprop), step1comps[idx],
+           "serialize(" + subprop + ")+parse should be the identity " +
+           "transform for '" + property + ": " + value + "'");
+      }
+      is(gDeclaration.getPropertyValue(property), step1val,
+         "parse+split+serialize should be idempotent for '" +
+         property + colon + value + "'");
+    }
+
+    // FIXME(emilio): Why is mask special?
+    if (info.type != CSS_TYPE_TRUE_SHORTHAND &&
+        property != "mask") {
+      gDeclaration.removeProperty(property);
+      gDeclaration.setProperty(property, step1comp, "");
+      var func = xfail_compute(property, value) ? todo_is : is;
+      func(gComputedStyle.getPropertyValue(property), step1comp,
+           "parse+compute+serialize should be idempotent for '" +
+           property + ": " + value + "'");
+    }
+    if ("subproperties" in info && !is_system_font) {
+      gDeclaration.removeProperty(property);
+      for (idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        gDeclaration.setProperty(subprop, step1comps[idx], "");
+      }
+
+      // Now that all the subprops are set, check their values.  Note that we
+      // need this in a separate loop, in case parts of the shorthand affect
+      // the computed values of other parts.
+      for (idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        is(gComputedStyle.getPropertyValue(subprop), step1comps[idx],
+           "parse+compute+serialize(" + subprop + ") should be idempotent for '" +
+           property + ": " + value + "'");
+      }
+    }
+
+    // sanity check shorthands to make sure disabled props aren't exposed
+    if (info.type != CSS_TYPE_LONGHAND) {
+      gDeclaration.setProperty(property, value, "");
+      test_remove_all_properties(property, value);
+    }
+
+    gDeclaration.removeProperty(property);
+  }
+
+  function test_value_without_variable(value) {
+    test_value(value, null);
+  }
+
+  function test_value_with_variable(value) {
+    gPrereqDeclaration.setProperty("--a", value, "");
+    test_value("var(--a)", value);
+    gPrereqDeclaration.removeProperty("--a");
+  }
+
+  if ("prerequisites" in info) {
+    var prereqs = info.prerequisites;
+    for (var prereq in prereqs) {
+      gPrereqDeclaration.setProperty(prereq, prereqs[prereq], "");
+    }
+  }
+
+  var idx;
+  for (idx in info.initial_values) {
+    test_value_without_variable(info.initial_values[idx]);
+    test_value_with_variable(info.initial_values[idx]);
+  }
+  for (idx in info.other_values) {
+    test_value_without_variable(info.other_values[idx]);
+    test_value_with_variable(info.other_values[idx]);
+  }
+
+  if ("prerequisites" in info) {
+    for (var prereq in info.prerequisites) {
+      gPrereqDeclaration.removeProperty(prereq);
+    }
+  }
+
+}
+
+function runTest() {
+  // To avoid triggering the slow script dialog, we have to test one
+  // property at a time.
+  var props = [];
+  for (var prop in gCSSProperties) {
+    var info = gCSSProperties[prop];
+    if ("subproperties" in info) {
+      for (var idx in info.subproperties) {
+        var subprop = info.subproperties[idx];
+        if (!(subprop in gPropertyShorthands)) {
+          gPropertyShorthands[subprop] = [];
+        }
+        gPropertyShorthands[subprop].push(prop);
+      }
+    }
+    props.push(prop);
+  }
+  props = props.reverse();
+  function do_one() {
+    if (props.length == 0) {
+      SimpleTest.finish();
+      return;
+    }
+    test_property(props.pop());
+    SimpleTest.executeSoon(do_one);
+  }
+  SimpleTest.executeSoon(do_one);
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestLongerTimeout(7);
+runTest();
+</script>
+</pre>
+</body>
+</html>