WebKit/Blink supports three overloads of window.postMessage(): "postMessage(message, targetOrigin)", "postMessage(message, targetOrigin, transferables)" and "postMessage(message, transferables, targetOrigin)" The last one being an accident of history as implementation and spec initially evolved, but an overload that got stuck. As it has little or no actual use (Link1), it will be deprecated and removed. Any remaining uses will have to swap arguments.


Status in Chromium


Deprecated (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


Last updated on 2021-08-29