The inspector/highlighter implementation is here:
https://github.com/firebug/firebug/blob/master/extension/content/firebug/html/inspector.js

The CSS used to highlight elements on the page is here:

chrome://firebug/content/html/highlighter.css
https://github.com/firebug/firebug/blob/master/extension/content/firebug/html/inspector.js#L11

See also highlightObject withe detailed comments
https://github.com/firebug/firebug/blob/master/extension/content/firebug/html/inspector.js#L34


Honza


On Wednesday, December 12, 2012 8:04:06 PM UTC+1, ha5bro wrote:
>
> What kind of markup/css is tossed at the browser when this happens? ie. 
> Does firebug do anything like add position:relative to the <html> element?

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