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I clicked on a cache link and a "Google Error" (title: 404) pop-up appeared! It was about 1.5 x 3 inches.
pop-up file location: [216.239.51.100...]
Anyone else seen this?
it just seems really odd, because I saw the site on the cache link, so the site itself wasn't 404.
Happens when you view a cached page. Go to the actual page and you'll see what that site wanted to show.
For the terminally curious, to the best of my knowledge Google has only ever done one pop-up: the info page before downloading the toolbar that says "Warning! Please read this! It's not the usual yada yada!" We care so much about informing our users that we open a new page to get their consent.
But the answer is that you won't see pop-ups from Google in search results. If you do, it's most likely scumware. :)
skiguide: it just seems really odd, because I saw the site on the cache link, so the site itself wasn't 404.
This came up once before [webmasterworld.com].
The gist of the problem is this: Google adds a BASE element [w3.org] to every cached page so that hyperlinks with relative URIs resolve properly. However, Internet Explorer for Windows doesn't use the BASE element when resolving URIs that appear in Javascript, so Javascript-created pop-ups accidentally resolve to Google instead of the cached site.
Googleguy: For the terminally curious, to the best of my knowledge Google has only ever done one pop-up: the info page before downloading the toolbar
You also had the "Take a quick tour of Google" pop-up in the summer of 2001. You can still see it in the Internet Archive [web.archive.org].