[tracker1]

The trouble with this... is that the functionality behind ad service (iframes, remote content, etc) is very functionally useful... as is/was being able to open a window. It's simply abused.

If iframes were limited to 1 layer deep in the browsers that would change a lot, as ad networks wouldn't be able to cross-bounce for 10+ layers if iframes each with their tracking and behavior scripts (poorly written) running in the browser, and throwing up errors all over my console output.

For that matter, It's not unreasonable to serve ads from the origin domain... it is very easy to do, and can cover some interesting models with advertising... integration can come in other ways, as could server-side integration methods. There are better ways to serve ads... the "liquidity" mentioned in another post is generally of poor and dubious quality.