Function isAtEdgeOfBlock

modules/tinymce/src/core/main/ts/api/html/DomParser.ts:213–222

(node: AstNode, start: boolean)

    node.name in blockElements || TransparentElements.isTransparentAstBlock(schema, node) || (Namespace.isNonHtmlElementRootName(node.name) && node.parent === root);

  const isAtEdgeOfBlock = (node: AstNode, start: boolean): boolean => {
    const neighbour = start ? node.prev : node.next;
    if (Type.isNonNullable(neighbour) || Type.isNullable(node.parent)) {
      return false;
    }

    // Make sure our parent is actually a block, and also make sure it isn't a temporary "context" element
    // that we're probably going to unwrap as soon as we insert this content into the editor
    return isBlock(node.parent) && (node.parent !== root || args.isRootContent === true);
  };

  const preprocess = (node: AstNode) => {
    if (node.type === 3) {