Function _createNodeIterator

src/purify.ts:1515–1537

(root: Node)

   * @return The created NodeIterator
   */
  const _createNodeIterator = function (root: Node): NodeIterator {
    /* Read ownerDocument through the cached Node.prototype getter, never the
       direct property. HTMLFormElement has [LegacyOverrideBuiltIns], so a
       clobbering child (<input name="ownerDocument"> or a form-associated
       external input) shadows the prototype getter and makes a direct read
       return that <input>. createNodeIterator.call(<input>, ...) then throws
       "Illegal invocation", and on the IN_PLACE path that throw lands before
       the walk's fail-closed barrier - leaving the caller's live tree, with
       any already-armed handler in it, un-neutralized. The cached getter
       returns the real Document regardless of the clobber. */
    const doc = getOwnerDocument ? getOwnerDocument(root) : root.ownerDocument;
    return createNodeIterator.call(
      doc || root,
      root,
      // eslint-disable-next-line no-bitwise
      NodeFilter.SHOW_ELEMENT |
        NodeFilter.SHOW_COMMENT |
        NodeFilter.SHOW_TEXT |
        NodeFilter.SHOW_PROCESSING_INSTRUCTION |
        NodeFilter.SHOW_CDATA_SECTION,
      null
    );
  };

  /**
   * Replace template expression syntax (mustache, ERB, template