is_postmessages_synchronous.md

Is postMessages synchronous

Is postMessages synchronous?

The postMessage API is asynchronous. The message is posted to the message queue and handled later, allowing the rest of the script to continue executing without blocking.

Example:

window.postMessage('message', 'https://example.com');
console.log('Message sent');  // Output: Message sent

Tags: intermediate, JavaScript, Web APIs