Can I apply CSS to the elements within an iframe?

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No, not from outside the iframe. An <iframe> is its own world. If the domains etc. match, then Javascript can communicate in and out, and could (if it wanted to) inject CSS into a child frame.

If the <iframe> contains content from a different domain, there’s pretty much nothing you can do. The parent page controls the size of the frame and whether it’s visible, and can put its own content over the frame by positioning etc, but it can’t directly effect the way the actual frame content is rendered.

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