HTML <label> id Attribute

HTML <kbd>

HTML <legend>

An id on a <label> tag assigns an identifier to the label.

The identifier must be unique across the page.

Example

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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> &nbsp;
    <input type="text" id="firstname" name="firstname"><br /><br />

    <label for="lastname" id="label-lastname">Last name</label> &nbsp;
    <input type="text" id="lastname" name="lastname"><br /><br />

    <input type="submit" value="Submit">
  </fieldset>
</form>

Using id

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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.

Syntax

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<label id="identifier" />

Values

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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

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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>

Code explanation

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.

Browser support

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Here is when id support started for each browser: