Can the CSS of a parent page be modified from an iframe when the parent page and iframe are hosted on separate domains?
Can the CSS of a parent page be modified from an iframe when the parent page and iframe are hosted on separate domains?
Moreover, not only Firefox , Opera, Chrome but also IE8 have implemented the html5 "postMessage" api. You can check out this link to see how it allows secure cross-domain data transmission between frames, iframes, and popups, functioning like an event system. Surprisingly, IE8 supports this feature as well.
In conclusion: While you can't directly manipulate the DOM of a page from a different domain, you can communicate with it to achieve your desired changes through cooperation.
Your request is simply not feasible.
Take a look at these related inquiries:
How to access parent Iframe from javascript
javascript access parent DOM across domains?
cross domain access in iframe from child to parent
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