HTML <output> class Attribute

The class attribute on an <output> tag assigns one or more classnames to the output element. Classes are used to style elements. Classnames are defined in a stylesheet or in a local <style> element.

Example

#

A class attribute styling an <output> element.



The value is 25
<style>
  .output-result {
    background-color: #4238ca;
    color: #fff;
    padding: 8px 15px;
    margin: 5px;
    border-radius: 10px;
  }
</style>

<form oninput="result.value = slider.value">
  <input type="range" id="slider" value="25"> 

  <br /><br />
  The value is <output class="output-result"
                       name="result"
                       for="slider">25</output>
</form>

Using class

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

Multiple classnames are separated by a space.

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

JavaScript uses classes to access one or more elements by classname.

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


Syntax

<output class="classnames">

Values

#

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

More Examples

A class attribute styling an <output> element.
Clicking the button toggles a classname that changes the output background and text colors.



The value is 25

<style>
  .output {
    background-color: #4238ca;
    color: #fff;
    padding: 8px 15px;
    margin: 5px;
    border-radius: 10px;
  }
  .bg-lighter { 
    background-color: #808cf8; 
  }
</style>

<form oninput="display.value = range.value">
  <input type="range" id="range" value="25"> 

  <br /><br />
  The value is <output class="output" id="myoutput"
                       name="display"
                       for="range">25</output>
</form>

<br />
<button onclick="toggle();">Toggle class</button>

<script>
  let toggle = () => {
    let element = document.getElementById("myoutput");
    element.classList.toggle("bg-lighter");
  }
</script>

Code explanation

Three CSS classes are defined in the <style> element.

The class attribute in <output> assigns two of these classnames.

Repeatedly clicking the button toggles another class, changing the background and text color of the <output>.


Browser support

Here is when class support started for each browser:

Chrome
10.0 Mar 2011
Firefox
4.0 Mar 2011
IE/Edge
13.0 Nov 2015
Opera
11.0 Dec 2010
Safari
5.1 Oct 2011

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