HTML <details> class Attribute

HTML <del>

HTML <div>

The class attribute assigns one or more classnames to the <del> tag.

Classnames are defined in a stylesheet or in a local <style> element.

Classes, i.e. classnames, are used for styling the del element.

Example

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A class attribute styling a <details> element.

Van Gogh's Paintings

Sunflowers

Starry Night

Self Portrait

<style>
  .bg-blue { background-color:aliceblue;padding: 10px; }
</style>

<details class="bg-blue">
  <summary>Van Gogh's Paintings</summary>
  <p>Sunflowers</p>
  <p>Starry Night</p>
  <p>Self Portrait</p>
</details>

Using class

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Classes (i.e. classnames) are used for styling the del element.

Multiple classnames are separated by a space.

JavaScript uses classes to access elements by classname.

Tip: class is a global attribute that can be applied to any HTML element.

Syntax

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<details class="classnames" >

Values

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Value	Description
classnames	One or more space-separated class names.

More Examples

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A class attribute styling a <details> element.
Clicking the button toggles a classname that changes the background color.

Van Gogh's Paintings

Sunflowers

Starry Night

Self Portrait

<style>
  .bg-blue { background-color:aliceblue;padding: 10px; }
  .bg-turq { background-color:paleturquoise; }
</style>

<details class="bg-blue" id="mydetails">
  <summary>Van Gogh's Paintings</summary>
  <p>Sunflowers</p>
  <p>Starry Night</p>
  <p>Self Portrait</p>
</details>

<br/>
<button onclick="toggle();">Toggle class</button>

<script>
  let toggle = () => {
    let element = document.getElementById("mydetails");
    element.classList.toggle("bg-turq");
  }
</script>