layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x600
  LayoutBlockFlow {HTML} at (0,0) size 800x600
    LayoutBlockFlow {BODY} at (8,8) size 784x584
      LayoutBlockFlow {DIV} at (0,0) size 784x18
        LayoutText {#text} at (0,0) size 139x17
          text run at (0,0) width 139: "some highlighted text"
caret: position 0 of child 0 {#text} of child 0 {DIV} of body