JavaScript Custom_events Guide
Custom events enable decoupled component communication using the standard Event API. The guide walks through Creating & Dispatching. `new CustomEvent("my-event",{detail:{key:"val"},bubbles:true})`. Dispatch: `element.dispatchEvent(event)`. Listen: `element.addEventListener("my-event",handler)`. Access data: `event.detail`. Options: bubbles (propagates), cancelable, composed (crosses shadow DOM). The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.