isDocumentRootBox property

bool get isDocumentRootBox

Whether current box is the root of the document which corresponds to HTML element in dom tree.

Implementation

bool get isDocumentRootBox {
  // Get the outer box of overflow scroll box
  RenderBoxModel currentBox = isScrollingContentBox ? parent as RenderBoxModel : this;
  // Root element of document is the child of viewport.
  return currentBox.parent is RenderViewportBox;
}