HTMLDetailsElement: toggle event

The toggle event fires when the open/closed state of a <details> element is toggled.

Bubbles No
Cancelable No
Interface Event
Event handler property None
Default Action Toggles the open state of the <details> element.


This example logs chapters that are open. Chapters are removed from the log when they are closed.


<aside id="log">
  <b>Open chapters:</b>
  <div data-id="ch1" hidden>I</div>
  <div data-id="ch2" hidden>II</div>
  <div data-id="ch3" hidden>III</div>
<section id="summaries">
  <b>Chapter summaries:</b>
  <details id="ch1">
    <summary>Chapter I</summary>
    Philosophy reproves Boethius for the foolishness of his complaints against Fortune. Her very nature is caprice.
  <details id="ch2">
    <summary>Chapter II</summary>
    Philosophy in Fortune's name replies to Boethius' reproaches, and proves that the gifts of Fortune are hers to give and to take away.
  <details id="ch3">
    <summary>Chapter III</summary>
    Boethius falls back upon his present sense of misery. Philosophy reminds him of the brilliancy of his former fortunes.


body {
  display: flex;
  flex-direction: row-reverse;

#log {
  flex-shrink: 0;
  padding-left: 3em;

#summaries {
  flex-grow: 1;


function logItem(e) {
  const item = document.querySelector(`[data-id=${}]`);

const chapters = document.querySelectorAll('details');
chapters.forEach((chapter) => {
  chapter.addEventListener('toggle', logItem);



HTML Standard
# event-toggle

Browser compatibility

BCD tables only load in the browser