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feature: iframe[seamless] status: avoid tags: none kind: html polyfillurls: moreurl:

This attribute instructs browsers to treat the iFrame's content more like inline markup than it would otherwise. Specifically, this means:

  • Hyperlinks navigate the parent context
  • The parent's stylesheets cascade in (importantly, the inverse is not true)
  • More "neutral" rendering, roughly equivalent to declaring: scrolling="no" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0"

The user experience of following hyperlinks is drastically altered in supporting browsers.

Should be avoided because of the lack of browser support (Chrome 20-26 had partial support behind a flag, though this was later removed).