TreeWalker-nextNode-detached-currentNode.window.js

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This WPT test may be referenced by the following Test IDs:
- /dom/traversal/TreeWalker-nextNode-detached-currentNode.window.html - WPT Dashboard Interop Dashboard

test(() => {

  const detached = document.createElement("div");

  const walker = document.createTreeWalker(document, 0, null);

  walker.currentNode = detached;

  assert_equals(walker.nextNode(), null);

}, "nextNode() returns null when currentNode is a detached element with no descendants and whatToShow does not match it");

test(() => {

  const detached = document.createElement("div");

  detached.appendChild(document.createElement("span"));

  const walker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT, null);

  walker.currentNode = detached;

  assert_equals(walker.nextNode(), detached.firstChild);

  assert_equals(walker.nextNode(), null);

}, "nextNode() returns null after exhausting a detached subtree");

test(() => {

  const template = document.createElement("template");

  template.innerHTML = "text<div></div>text";

  const walker = document.createTreeWalker(

    document,

    NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT,

    null);

  walker.currentNode = template.content;

  assert_equals(walker.nextNode(), template.content.children[0]);

  assert_equals(walker.nextNode(), null);

}, "nextNode() terminates when iterating over template.content not under the walker's root");