test_value_cloning.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=375363

-->

<head>

  <title>Test for cloning of CSS property values (including 'inherit', 'initial' and 'unset')</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" />

</head>

<body>

<p id="display"><iframe id="iframe" src="about:blank"></iframe></p>

<pre id="test">

<script class="testbody" type="text/javascript">

/** Test for cloning of CSS property values (including 'inherit', 'initial' and 'unset') **/

var test_queue = [];

var iframe = document.getElementById("iframe");

SimpleTest.waitForExplicitFinish();

for (var prop in gCSSProperties) {

  let info = gCSSProperties[prop];

  test_queue.push({ prop: prop, value: "inherit",

                    inherited_value: info.initial_values[0] });

  test_queue.push({ prop: prop, value: "inherit",

                    inherited_value: info.other_values[0] });

  test_queue.push({ prop: prop, value: "initial" });

  if (info.inherited) {

    test_queue.push({ prop: prop, value: "unset",

                      inherited_value: info.initial_values[0] });

    test_queue.push({ prop: prop, value: "unset",

                      inherited_value: info.other_values[0] });

  } else {

    test_queue.push({ prop: prop, value: "unset" });

  for (let idx in info.initial_values) {

    test_queue.push({ prop: prop, value: info.initial_values[idx] });

  for (let idx in info.other_values) {

    test_queue.push({ prop: prop, value: info.other_values[idx] });

test_queue.reverse();

doTest();

function doTest()

  var sheet_data = "";

  for (let idx = 0; idx < test_queue.length; ++idx) {

    var current_item = test_queue[idx];

    let info = gCSSProperties[current_item.prop];

    sheet_data += "#parent"+idx+", #test"+idx+" { ";

    for (var prereq in info.prereqs) {

      sheet_data += prereq + ": " + info.prereqs[prereq] + ";";

    sheet_data += " }";

    sheet_data += "#parent"+idx+" { ";

    if ("inherited_value" in current_item) {

      sheet_data += current_item.prop + ": " + current_item.inherited_value;

    sheet_data += "}";

    sheet_data += "#test"+idx+" { ";

    sheet_data += current_item.prop + ": " + current_item.value;

    sheet_data += "}";

  var sheet_url = "data:text/css," + escape(sheet_data);

  var doc_data =

    "<!DOCTYPE HTML>\n" +

    "<link rel='stylesheet' type='text/css' href='" + sheet_url + "'>\n" +

    "<link rel='stylesheet' type='text/css' href='" + sheet_url + "'>\n" +

    "<body>\n";

  for (let idx = 0; idx < test_queue.length; ++idx) {

    var current_item = test_queue[idx];

    if ("inherited_value" in current_item) {

      doc_data += "<span id='parent"+idx+"'>";

    doc_data += "<span id='test"+idx+"'></span>";

    if ("inherited_value" in current_item) {

      doc_data += "</span>";

  var doc_url = "data:text/html," + escape(doc_data);

  iframe.onload = iframe_loaded;

  iframe.src = doc_url;

function iframe_loaded(event)

  if (event.target != iframe)

    return;

  var start_ser = [];

  var start_compute = [];

  var test_cs = [];

  var wrappedFrame = SpecialPowers.wrap(iframe);

  var ifdoc = wrappedFrame.contentDocument;

  var ifwin = wrappedFrame.contentWindow;

  for (let idx = 0; idx < test_queue.length; ++idx) {

    var current_item = test_queue[idx];

    var info = gCSSProperties[current_item.prop];

    var test = ifdoc.getElementById("test" + idx);

    var cur_cs = ifwin.getComputedStyle(test);

    test_cs.push(cur_cs);

    var cur_ser = ifdoc.styleSheets[0].cssRules[3*idx+2].style.getPropertyValue(current_item.prop);

    if (cur_ser == "") {

      isnot(cur_ser, "",

	    "serialization should be nonempty for " +

	    current_item.prop + ": " + current_item.value);

    start_ser.push(cur_ser);

    var cur_compute = get_computed_value(cur_cs, current_item.prop);

    if (cur_compute == "") {

      isnot(cur_compute, "",

            "computed value should be nonempty for " +

            current_item.prop + ": " + current_item.value);

    start_compute.push(cur_compute);

  // In case the above access didn't force a clone already (though it

  // currently does), clone the second style sheet's inner and then

  // remove the first.

  ifdoc.styleSheets[1].insertRule("#nonexistent { color: red }", 0);

  var firstlink = ifdoc.getElementsByTagName("link")[0];

  firstlink.remove();

  // Force a flush

  ifdoc.body.style.display="none";

  var ow = ifdoc.body.offsetWidth;

  ifdoc.body.style.display="";

  for (let idx = 0; idx < test_queue.length; ++idx) {

    var current_item = test_queue[idx];

    var info = gCSSProperties[current_item.prop];

    var end_ser =

      ifdoc.styleSheets[0].cssRules[3*idx+3].style.getPropertyValue(current_item.prop);

    is(end_ser, start_ser[idx],

       "serialization should match when cloning " +

       current_item.prop + ": " + current_item.value);

    var end_compute = get_computed_value(test_cs[idx], current_item.prop);

    // Output computed values only when the test failed.

    // Computed values may be very long.

    if (end_compute == start_compute[idx]) {

      ok(true,

         "computed values should match when cloning " +

         current_item.prop + ": " + current_item.value);

    } else {

      is(end_compute, start_compute[idx],

         "computed values should match when cloning " +

         current_item.prop + ": " + current_item.value);

  SimpleTest.finish();

</script>

</pre>

</body>

</html>