I’ll translate the full article, preserving its informal tone, links, and code examples.

I’ll translate the full article, preserving its informal tone, links, and code examples. # Displaying MP3 Audio Waveforms with wavesurfer.js by zhangxinxu, from https://www.zhangxinxu.com/wordpress/?p=8290 This article may be reproduced in full. Personal websites do not need per...

Code: Dispatching a CustomEvent

const event = new CustomEvent('show', {
  detail: { message: payload, sentAt: new Date().toLocaleTimeString() }
});

window.dispatchEvent(event);

Code: Listening for the Event Payload

window.addEventListener('show', (event) => {
  render(event.detail.message, event.detail.sentAt);
});