Can I use
?

Cross-document messaging

- LS

Method of sending information from a page on one domain to a page on a different one (using postMessage)

Chrome

  1. 4 - 112: Supported
  2. 113: Supported
  3. 114 - 116: Supported

Edge

  1. 12 - 112: Supported
  2. 113: Supported

Safari

  1. 3.1 - 3.2: Not supported
  2. 4 - 16.4: Supported
  3. 16.5: Supported
  4. 16.6 - TP: Supported

Firefox

  1. 2: Not supported
  2. 3 - 112: Supported
  3. 113: Supported
  4. 114 - 115: Supported

Opera

  1. 9: Not supported
  2. 9.5 - 98: Supported
  3. 99: Supported

IE

  1. 5.5 - 7: Not supported
  2. 8 - 9: Partial support
  3. 10: Partial support
  4. 11: Partial support

Chrome for Android

  1. 113: Supported

Safari on iOS

  1. 3.2 - 16.4: Supported
  2. 16.5: Supported

Samsung Internet

  1. 4 - 20: Supported
  2. 21: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10 - 12.1: Supported
  2. 73: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 4.4.4: Supported
  2. 113: Supported

Firefox for Android

  1. 113: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
MDN Web Docs - window.postMessage
Simple demo
has.js test
WebPlatform Docs
Sub-features:
Channel messaging