The original HTML/CSS specifications were unclear about the intended behavior for elements inside display:none iframes. [Do they get CSS boxes? Are they rendered?] This has led to a divergence in behavior between UAs. The specs are in the process of being clarified, and the new spec matches the behavior of Edge and Gecko [which do not perform box construction or layout]. Note that Chrome's current behavior has negative performance implications.


Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped/Shipping
  • No signal
  • No signals


Last updated on 2020-11-19