test_domWindowUtils_scrollbarSize.html

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<html>

<head>

  <title>nsIDOMWindowUtils::getScrollbarSize test</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">

</head>

<body id="body">

  <script type="application/javascript">

    function doTests() {

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

      let cwindow = iframe.contentWindow;

      let utils = SpecialPowers.getDOMWindowUtils(cwindow);

      let doc = cwindow.document;

      function haveNonFloatingScrollbars() {

        return doc.getElementById("float").offsetWidth > 200;

      checkScrollbarSizeFlush(utils, (w, h) => w == 0 && h == 0,

        "[overflow=hidden] corrrect scrollbar size after flushing");

      // Some platforms (esp. mobile) may have floating scrollbars that don't

      // affect layout. Thus getScrollbarSize() would always return zeros.

      if (haveNonFloatingScrollbars()) {

        let body = doc.querySelector("body");

        body.style.overflowY = "scroll";

        checkScrollbarSize(utils, (w, h) => w == 0 && h == 0,

          "[overflowY=scroll] correct scrollbar size w/o flushing");

        checkScrollbarSizeFlush(utils, (w, h) => w > 0 && h == 0,

          "[overflowY=scroll] correct scrollbar size after flushing");

        body.style.overflowX = "scroll";

        checkScrollbarSize(utils, (w, h) => w > 0 && h == 0,

          "[overflowXY=scroll] correct scrollbar size w/o flushing");

        checkScrollbarSizeFlush(utils, (w, h) => w > 0 && h > 0,

          "[overflowXY=scroll] correct scrollbar size after flushing");

      SimpleTest.finish();

    function checkScrollbarSize(utils, check, msg, flush = false) {

      let width = {}, height = {};

      utils.getScrollbarSize(flush, width, height);

      ok(check(width.value, height.value), msg);

    function checkScrollbarSizeFlush(utils, check, msg) {

      checkScrollbarSize(utils, check, msg, true);

    SimpleTest.waitForExplicitFinish();

  </script>

  <iframe src="http://mochi.test:8888/tests/dom/tests/mochitest/general/file_domWindowUtils_scrollbarSize.html"

          id="iframe" onload="doTests();">

  </iframe>

</body>

</html>