Thanks to the WebContents Occlusion feature in Chromium, the Page Visibility Web API will now reflect accurately the visibility state of web pages, especially when they are occluded. In other words, the document.visibilityState value will be “hidden” when browser tab/window is covered by one or multiple window(s).


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.

  • No signal
  • No signal
  • No signals



The WebContents Occlusion feature is supported only on Chrome OS and macOS at this time. Windows support is in progress.

Last updated on 2021-12-13