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An HTML-based easter egg makes your results blink. Searching for either "blink HTML" or "blink tag" will alter your page to reflect this HTML code.
You can also type in "shake" and "tilt" on Google to skew your results page.
Another HTML-based easter egg: If you use the HTML marquee code in the Google search engine box then results will begin to slide across the screen.
Travel back in time with Google in 1998
Feeling nostalgic? Type in "Google in 1998" to be transported back to how the search engine looked over a decade ago.