HTML <output> id Attribute

The id attribute on an <output> tag assigns an identifier to the output element. The identifier must be unique across the page.

Example

#

An id attribute on an <output> tag.



The value is 25
<form oninput="result.value = slider.value">
  <input type="range" id="slider" value="25"><br /><br />
  
  The value is <output id="result" name="result" for="slider">25</output>
</form>

Using id

The id attribute assigns an identifier to the <output> element.

The identifier must be unique across the page.

The id allows programmatic access to the <output> element.

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


Syntax

<output id="identifier" />

Values

#

Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

An <output> tag with a unique id.
Clicking the button displays the output value.



The value is 25

<form oninput="result.value = slider.value">
  <input type="range" id="slider" value="25"> 
  <br /><br />
  The value is <output id="myoutput" name="result" for="slider">25</output>
</form>

<br/>
<button onclick="show();">Show output value</button>

<script>
  let show = () => {
    let element = document.getElementById("myoutput");
    alert("Value = " + element.innerHTML);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <output>.

Clicking the button calls JavaScript which locates the <output> using the id.

Finally, the value of the <output> element is displayed in an alert box.


Browser support

Here is when id 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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