An id on a <label> tag assigns an identifier to the label.
The identifier must be unique across the page.
An id attribute on 2 <label> elements.
<form action="/tutorial/action.html">
<fieldset>
<legend>User Information</legend>
<label for="firstname" id="label-firstname">First name</label>
<input type="text" id="firstname" name="firstname"><br /><br />
<label for="lastname" id="label-lastname">Last name</label>
<input type="text" id="lastname" name="lastname"><br /><br />
<input type="submit" value="Submit">
</fieldset>
</form>
The id attribute assigns an identifier to the <label> element.
The id allows JavaScript to easily access the <label> 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.
<label 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 (.). |
A <label> tag with a unique id.
Clicking the button displays the label text.
<form>
<label id="mylabel" for="firstname">First Name</label><br />
<input type="text" id="firstname" name="firstname">
</form>
<br />
<button onclick="show();">Show label</button>
<script>
let show = () => {
let element = document.getElementById("mylabel");
alert("Label = " + element.innerHTML);
}
</script>
The id attribute assigns a unique identifier for the <label>.
Clicking the button calls JavaScript which locates the <label> using the id.
Finally, the content of the <label> is displayed in an alert box.
Here is when id support started for each browser:
 Chrome
|
1.0 | Sep 2008 |
 Firefox
|
1.0 | Sep 2002 |
 IE/Edge
|
1.0 | Aug 1995 |
 Opera
|
1.0 | Jan 2006 |
 Safari
|
1.0 | Jan 2003 |
Back to <label>
