Give Overviews Early is a web design slogan that I thought up when redesigning my proof of the Pythagorean theorem page. With lots of large drawings and text stranded between them, there was no way to get a good overview of what was going on. Grouping the figures together and making them much more compact helped immensely:
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The normal idea that people have of an overview or summary is that it's a repetition of content in a more compact form. But summaries don't have to be repetitious. Compare how difficult it is to create a favicon by making it large at first and then shrinking it to be smaller. So by compacting the original content and making it available before the browser pagebreak, it was possible to give an overview immediately on screen media.