Imagine for a moment that you wanted to "snapshot" an image of the page (like a thumbnail). Something similar to printing it to paper. You would want it to be completely finished rendering all the <img> tags and any background images for things.
Which implies that all scripts are disabled, correct?
When you render an image for printing purposes, you MUST have some way to know that all the rendering and styles are finished, right?
Nope. It's quite possible to print a page with a half-downloaded background, if I read the code right...
