To prevent unintended clicks/taps, quietly discard input events that target cross-origin iframes that have recently resized or moved a non-trivial distance within the embedding page's viewport. The shipped version limits the intervention to cross-origin iframes that are using the V2 feature set of IntersectionObserver (


The motivation is perhaps best conveyed by this hilarious video: We would like to prevent untrustworthy embedders from using visual bait-and-switch tactics to induce users to click or tap on a third-party iframe.



No public standards discussion

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 77
  • Chrome for Android release 77
  • Android WebView release 77

Consensus & Standardization

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

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Last updated on 2021-03-12