HTMLDetailsElement

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

* Some parts of this feature may have varying levels of support.

The HTMLDetailsElement interface provides special properties (beyond the regular HTMLElement interface it also has available to it by inheritance) for manipulating <details> elements.

EventTarget Node Element HTMLElement HTMLDetailsElement

Instance properties

Inherits properties from its parent, HTMLElement.

HTMLDetailsElement.name

A string reflecting the name HTML attribute, which allows you to create a group of mutually-exclusive <details> elements. Opening one of the named <details> elements of this group causes other elements of the group to close.

HTMLDetailsElement.open

A boolean value reflecting the open HTML attribute, indicating whether or not the element's contents (not counting the <summary>) is to be shown to the user.

HTML

html
<section id="summaries">
  <p>Chapter summaries:</p>
  <details id="ch1">
    <summary>Chapter I</summary>
    Philosophy reproves Boethius for the foolishness of his complaints against
    Fortune. Her very nature is caprice.
  </details>
  <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>
  <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.
  </details>
</section>
<aside id="log">
  <p>Open chapters:</p>
  <div data-id="ch1" hidden>I</div>
  <div data-id="ch2" hidden>II</div>
  <div data-id="ch3" hidden>III</div>
</aside>

CSS

css
body {
  display: flex;
}

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

#summaries {
  flex-grow: 1;
}

JavaScript

js
function logItem(e) {
  console.log(e);
  const item = document.querySelector(`[data-id=${e.target.id}]`);
  item.toggleAttribute("hidden");
}

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