Can IFRAME Content Overlap the Parent Frame?

Overlapping IFRAME Content: A Security Hoax

Certain web UI widgets necessitate placement within IFRAMES for optimal performance and ease of distribution to affiliate websites. However, challenges arise when tooltips, an integral part of these widgets, need to extend beyond the boundaries of the IFRAME and overlap the parent frame.

Can content from within an IFRAME be made to overlap with the parent frame?

Answer:

Unfortunately, this is not a feasible scenario. Despite historical considerations, it would be deemed a security flaw in today's web landscape. Many sites embed untrusted content in IFRAMES to prevent modification of the parent frame due to the same-origin policy.

Allowing such untrusted content to extend outside IFRAME boundaries would create significant vulnerabilities. For example, malicious content could mimic login forms, capturing sensitive credentials intended for the legitimate parent frame.

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