Always feels separate from the application, imho. It should feel seamless.

Bugs

• 8 pixels too wide.
• 34 pixels too tall.
• Taking a screenshot of it using AltGr+PrtScn includes a 16 pixel high transparent area along the bottom edge.
• Can be resized but has no Minimise or Maximise button.
• Toggle buttons in the toolbar are always shown in the off position, even when they have turned something on. The Turn headers and footers on and off button, for example.
• Buttons in the toolbar are always shown as though none are selected, even when one is selected. The View Full Width and View Full Page button group, for example.
• File > Print Preview is enabled before the page has finished loading, even though it will display a blank page.

Ideas

• Make the File > Print Preview menu a ticked item:
  • When ticked, active tab shows preview.
  • When not ticked, active tab shows normal view.
• Provide scrollbars to access hidden pages more naturally (like Adobe Reader):
  • React to all scrolling commands the viewport normally reacts to.
• Buttons at the bottom of the window:
  • Use text instead of graphics:
    • First Page
    • Previous Page
    • Next Page
    • Last Page
  • Make them smaller and more like normal Windows XP buttons.
• Add the preview into that tab’s history:
  • Pressing Back returns to normal view.
  • Quickly compare views of the same document using Back and Forward.
  • Compare views of different documents by switching between tabs.
  • Do not put preview in the global history. The actual page is there already.
• Allow interactions with the page?
  • If it causes a new page to load, switch to normal view. This lets users “escape” from the preview.
  • Don’t let the page update dynamically or animate? (User probably wants a snapshot.)
• Allow the preview to render incrementally while the page loads.
• Don’t spawn a new window positioned over the browser for this.