third_party/web_platform_tests/dom/traversal/TreeWalker-traversal-skip-most.html

<!DOCTYPE html>
<html>
<!--
Test adapted from https://mxr.mozilla.org/chromium/source/src/third_party/WebKit/LayoutTests/fast/dom/TreeWalker/script-tests/traversal-skip-most.js
-->
<head>
<title>TreeWalker: traversal-skip-most</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="traversal-support.js"></script>
<link rel="stylesheet" href="/resources/testharness.css">
<div id=log></div>
</head>
<body>
<p>Test TreeWalker with skipping</p>
<script>
var testElement;
setup(function() {
    testElement = document.createElement("div");
    testElement.id = 'root';
    // testElement.innerHTML='<div id="A1"><div id="B1" class="keep"></div><div id="B2">this text matters</div><div id="B3" class="keep"></div></div>';
    // <div id="A1">
    //   <div id="B1" class="keep"></div>
    //   <div id="B2">this text matters</div>
    //   <div id="B3" class="keep"></div>
    // </div>


    // XXX for Servo, build the tree without using innerHTML
    var a1 = document.createElement("div"); a1.id = "A1";
    var b1 = document.createElement("div"); b1.id = "B1"; b1.className = "keep";
    var b2 = document.createElement("div"); b2.id = "B2";
    var b3 = document.createElement("div"); b3.id = "B3"; b3.className = "keep";

    testElement.appendChild(a1);
    a1.appendChild(b1);
    a1.appendChild(b2)
        .appendChild(document.createTextNode("this text matters"));
    a1.appendChild(b3);
});

var filter = {
  acceptNode: function(node) {
    if (node.className == 'keep')
      return NodeFilter.FILTER_ACCEPT;

    return NodeFilter.FILTER_SKIP;
  }
}

test(function()
{
    var walker = document.createTreeWalker(testElement, NodeFilter.SHOW_ELEMENT, filter);
    assert_node(walker.firstChild(), { type: Element, id: 'B1' });
    assert_node(walker.nextSibling(), { type: Element, id: 'B3' });
}, 'Testing nextSibling');

test(function()
{
    var walker = document.createTreeWalker(testElement, NodeFilter.SHOW_ELEMENT, filter);
    walker.currentNode = testElement.querySelectorAll('#B3')[0];
    assert_node(walker.previousSibling(), { type: Element, id: 'B1' });
}, 'Testing previousSibling');

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