layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderText {#text} at (0,0) size 373x19
        text run at (0,0) width 373: "This 404 error was intentionally generated by a test script."

============== Back Forward List ==============
        http://127.0.0.1:8000/navigation/error404-basic.html  **nav target**
curr->  http://127.0.0.1:8000/navigation/resources/error404.pl  **nav target**
===============================================