
Be aware the tool can be misleading on web pages with dynamically positioned content (such as this blog, as it will position the navigation area to the left depending on the browser width).
If you wonder how Google did this, it looks like a two-frame set up – navigation and content – where the bottom content frame itself is 100% filled with an iframe, which in turn loads the external page. Then in the bottom frame there will be a couple of white semi-transparent div’s overlaying that iframe. Interesting idea I think!
[Thanks Hebbet and Steffi]
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