An id on an <output> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on an <output> tag.
<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>
The id attribute assigns an identifier to the <output> element.
The id allows JavaScript to easily access the <output> element.
It is also used to point to a specific id selector in a style sheet.
Tip: id is a global attribute that can be applied to any HTML element.
<output id="identifier" />
| 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 (.). |
An <output> tag with a unique id.
Clicking the button displays the output value.
<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>
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.
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 |
Back to <output>
