HTML <header> id Attribute

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

Example

#

An id attribute on a <header>.

<header id="page-header">
    Cloud computing shortcuts ...
</header>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<header id="identifier" />

Values

#

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

More Examples

A <header> element with a unique id.
Clicking the button displays the content of the element.

Cloud computing and Crypto currency...

<header id="myheader">
  Cloud computing and Crypto currency...
</header>
  
<br/>
<button onclick="show();">Show header content</button>

<script>
  let show = () => {
    let header = document.getElementById("myheader");
    alert("Content = " + header.innerHTML);
  }
</script>

Code explanation

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

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

Finally, the content of the <header> element is displayed in an alert box.


Browser support

Here is when id support started for each browser:

Chrome
6.0 Sep 2010
Firefox
4.0 Mar 2011
IE/Edge
9.0 Mar 2011
Opera
11.1 Mar 2011
Safari
5.0 Jun 2010

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