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How does optimizely allow cross domain event listeners?

2 points by dennisvdvliet ↗ HN
Does anybody knows how optimizely allows you to select items in their interface?

It looks like they include the page as an iframe and after that put some extra layer on top of it allowing you to select certain items.

I'm wondering how they do that, somebody has any clue?

2 comments

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breck
They iframe does not contain content from a 3rd party domain. They proxy content through their domain:

    <iframe src="http://edit.optimizely.com/http://google.com?optimizely_compatibility=false&amp;optimizely_disable=true&amp;optimizely_load_script=https%3A%2F%2Fwww.optimizely.com%2Fjs%2Finnie-www-master-1092.366954744303823947.js&amp;optimizely_log=false&amp;optimizely_cache_buster=1367272480789"></iframe>