gecko-dev/dom/tests/mochitest/general/test_focusrings.xul

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<?xml-stylesheet href="/tests/SimpleTest/test.css" type="text/css"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<script type="application/javascript"
        src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript"
        src="/tests/SimpleTest/EventUtils.js"></script>
<script type="application/javascript"
        src="/tests/SimpleTest/WindowSnapshot.js"></script>

<html:style xmlns:html="http://www.w3.org/1999/xhtml" type="text/css">
* { outline: none; }
#l1:-moz-focusring, #l3:-moz-focusring, #b1:-moz-focusring { outline: 2px solid red; }
#l2:focus, #b2:focus { outline: 2px solid red; }
</html:style>

<script>
<![CDATA[

SimpleTest.waitForExplicitFinish();

function setOrRestoreTabFocus(newValue) {
  const prefSvcContractID = "@mozilla.org/preferences-service;1";
  const prefSvcIID = SpecialPowers.Ci.nsIPrefService;
  var prefs = SpecialPowers.Cc[prefSvcContractID].getService(prefSvcIID)
                                                   .getBranch("accessibility.");
  if (!newValue) {
    if (prefs.prefHasUserValue("tabfocus")) {
      prefs.clearUserPref("tabfocus");
    }
  } else {
    prefs.setIntPref("tabfocus", newValue);
  }
}

function snapShot(element) {
  var rect = element.getBoundingClientRect();
  adjustedRect = { left: rect.left - 6, top: rect.top - 6,
                   width: rect.width + 12, height: rect.height + 12 }
  return SpecialPowers.snapshotRect(window, adjustedRect, "transparent");
}

function runTest()
{
  setOrRestoreTabFocus(7);

  var isMac = (navigator.platform.indexOf("Mac") >= 0);
  var isWin = (navigator.platform.indexOf("Win") >= 0);

  function checkFocus(element, visible, testid)
  {
    var outline = getComputedStyle(element, "").outlineWidth;
    is(outline, visible ? "2px" : "0px", testid);
  }

  // make sure that a focus ring appears on the focused button
  if (navigator.platform.indexOf("Mac") >= 0) {
    var focusedButton = $("b3");
    ok(compareSnapshots(snapShot(focusedButton), snapShot($("b2")), true)[0], "unfocused shows no ring");
    focusedButton.focus();
    ok(compareSnapshots(snapShot(focusedButton), snapShot($("b2")), false)[0], "focus shows ring");
  }

  checkFocus($("l1"), false, "initial appearance");

  // we can't really test the situation on Windows where a dialog doesn't show
  // focus rings until a key is pressed, as the default state depends on what
  // kind of real user input, mouse or key, was last entered. But we can handle
  // the test regardless of which user input last occurred.
  $("l1").focus();
  var expectedVisible = (!isWin || getComputedStyle($("l1"), "").outlineWidth == "2px");
  testHTMLElements(htmlElements, isMac, isWin && !expectedVisible);

  if (isMac) {
    var prefs = SpecialPowers.Cc["@mozilla.org/preferences-service;1"].
                  getService(SpecialPowers.Ci.nsIPrefBranch);
    prefs.setBoolPref("accessibility.mouse_focuses_formcontrol", true);

    testHTMLElements(htmlElementsMacPrefSet, true, false);

    prefs.setBoolPref("accessibility.mouse_focuses_formcontrol", false);
  }

  $("l1").focus();
  checkFocus($("l1"), expectedVisible, "appearance on list after focus() with :moz-focusring");
  $("l2").focus();

  checkFocus($("l2"), true, "appearance on list after focus() with :focus");

  is(getComputedStyle($("l1"), "").outlineWidth, "0px", "appearance on previous list after focus() with :focus");

  synthesizeMouse($("l1"), 4, 4, { });
  checkFocus($("l1"), expectedVisible, "appearance on list after mouse focus with :moz-focusring");
  synthesizeMouse($("l2"), 4, 4, { });
  checkFocus($("l2"), true, "appearance on list after mouse focus with :focus");

  synthesizeMouse($("b1"), 4, 4, { });
  checkFocus($("b1"), !isMac && expectedVisible, "appearance on button after mouse focus with :moz-focusring");
  if (navigator.platform.indexOf("Mac") >= 0) {
    ok(compareSnapshots(snapShot($("b1")), snapShot($("b2")), false)[0], "focus after mouse shows no ring");
  }

  synthesizeMouse($("b2"), 4, 4, { });
  checkFocus($("b2"), !isMac, "appearance on button after mouse focus with :focus");

  // after a key is pressed, the focus ring will always be visible
  $("l2").focus();
  synthesizeKey("VK_TAB", { });
  checkFocus($("l3"), true, "appearance on list after tab focus");

  setOrRestoreTabFocus(0);
  SimpleTest.finish();
}

var htmlElements = [
  "<button id='elem'>Button</button>",
  "<input id='elem' class='canfocus'>",
  "<input id='elem' type='password' class='canfocus'>",
  "<input id='elem' type='button'>",
  "<input id='elem' type='checkbox'>",
  "<textarea id='elem' class='canfocus'></textarea>",
  "<select id='elem' class='canfocus'><option>One</select>",
  "<select id='elem' rows='5' class='canfocus'><option>One</select>",
  "<div id='elem' tabindex='0' class='canfocus' style='width: 10px; height: 10px;'></div>",
  "<a href='about:blank' class='canfocus' onclick='return false;'>about:blank</a>",
];

var htmlElementsMacPrefSet = [
  "<button id='elem' class='canfocus'>Button</button>",
  "<input id='elem' class='canfocus'>",
  "<input id='elem' type='button' class='canfocus'>",
  "<input id='elem' type='checkbox' class='canfocus'>",
];

function testHTMLElements(list, isMac, expectedNoRingsOnWin)
{
  var childwin = frames[0];
  var childdoc = childwin.document;
  var container = childdoc.getElementById("container");
  for (var e = 0; e < list.length; e++) {
    container.innerHTML = list[e];

    var elem = container.firstChild;

    var shouldFocus = !isMac || (elem.className == "canfocus");
    var ringSize = (shouldFocus ? (expectedNoRingsOnWin ? 2 : 1) : 0) + "px";
    if (elem.localName == "a")
      ringSize = "0px";

    synthesizeMouse(elem, 8, 8, { }, childwin);
    is(childdoc.activeElement, shouldFocus ? elem : childdoc.body, "mouse click on " + list[e]);
    is(childwin.getComputedStyle(elem, "").outlineWidth, ringSize, "mouse click on " + list[e] + " ring");

    if (childdoc.activeElement)
      childdoc.activeElement.blur();

    ringSize = (elem.localName == "a" ? "0" : (expectedNoRingsOnWin ? 2 : 1)) + "px";

    elem.focus();
    is(childdoc.activeElement, elem, "focus() on " + list[e]);
    is(childwin.getComputedStyle(elem, "").outlineWidth, ringSize,
       "focus() on " + list[e] + " ring");

    childdoc.activeElement.blur();
  }
}

SimpleTest.waitForFocus(runTest);

]]>
</script>

<listbox id="l1" class="plain" height="20"/>
<listbox id="l2" class="plain" height="20"/>
<listbox id="l3" class="plain" height="20"/>
<button id="b1" label="Button"/>
<button id="b2" label="Button"/>
<button id="b3" label="Button"/>

<iframe id="child" src="data:text/html,&lt;html&gt;&lt;style&gt;* { outline: none; -moz-appearance: none; } %23elem:focus { outline: 2px solid red; } %23elem:-moz-focusring { outline: 1px solid blue; }&lt;/style&gt;&lt;div id='container'&gt;&lt;/html&gt;"/>

<body xmlns="http://www.w3.org/1999/xhtml" style="height: 300px; overflow: auto;"/>

</window>