Or, if you're a programmer, this:

  ============================================== 
  |                                            |
  |            ---------------------           |
  |            |                   |           |
  |            |                   |           |
  |            |                   |           |
  |            |                   |           |
  |            |     (webpage)     |           |
  |            |                   |           |
  |            |                   |           |
  |            |                   |           |
  |            |                   |           |
  |            ---------------------           |
  |                                            |
  ==============================================

becomes this:

  ============================================== 
  |                                            |
  | -------------------- --------------------  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | |     (webpage)    | |      (code)      |  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | |                  | |                  |  |
  | -------------------- --------------------  |
  |                                            |
  ==============================================