Duplicate content page into nested iframe

[D T]

General question for the group:

If I navigate to a page say, www.xyz.com and append an iframe to the page, can I inject the iframe with some of the css, script tags, and dom elements from the www.xyz.com page without raising content security policy errors?

Thanks,

DT

[wOxxOm]

If the iframe is same-origin (e.g. no `src`) then you can do it easily. If it's cross-origin (like an iframe from web_accessible_resources) you can probably use chrome.declarativeNetRequest.updateDynamicRules (example) to set the  Access-Control-Allow-Origin (and related CORS headers as shown in various examples) for requests inside your iframe identified by the initiatorDomains condition in the example.

[D T]

Thanks, will give this a shot.