apply method

@override void apply(MarkupRenderObject root)

Called once all adapters are prepared, to change the markup of root.

Implementation

@override
void apply(MarkupRenderObject root) {
  final html = root.children.findWhere<MarkupRenderElement>((c) => c.tag == 'html') ?? root;
  var head = html.children.findWhere<MarkupRenderElement>((c) => c.tag == 'head');

  bool needsInsert = false;
  if (head == null) {
    head = html.createChildRenderElement('head');
    needsInsert = true;
  }

  final didApply = applyHead(head);
  if (didApply && needsInsert) {
    html.children.insertAfter(head);
  }
}