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Google ÜberProxy's Easter egg

It looks like the http://corp.google.com/ page has a fun Easter egg.

The page looks like a normal error page:

ÜberProxy: Error 400

But if you hover over the "What's ÜberProxy?" link, it shows a hidden Easter egg:

ÜberProxy: Error 400 with an Easter egg

To show/hide the "ÜP" image, it uses a simple CSS rule:

.easter-egg {
  display: none;
}

a.footer-link:hover + div.easter-egg {
  display: block;
}

The image is directly embedded in the HTML as a data URI:

ÜP Easter egg

In the old versions of the page, the image was always visible (https://web.archive.org/web/20130716091355/http://corp.google.com/):

Old version

See also

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A simple online editor for the InterSystems ObjectScript code.

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