layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x36
  LayoutBlockFlow {HTML} at (0,0) size 800x36
    LayoutBlockFlow {BODY} at (8,8) size 784x20
      LayoutBlockFlow {DIV} at (0,0) size 784x20
        LayoutText {#text} at (0,0) size 642x19
          text run at (0,0) width 642: "[~=] attribute selector looking for empty string in empty attribute (the text should not have red background)"