HTML <header> class Attribute

The class attribute on a <header> tag assigns one or more classnames to the header. Classes are used to style elements. Classnames are defined in a stylesheet or in a local <style> element.

Example

#

A class attribute styling a <header> element.

Company logo here...
<style>
  .header-dark {background:#1f2936; color:white; padding:10px;}
</style>

<header class="header-dark">
    Company logo here...
</header>

Using class

The class attribute assigns one or more classnames to the <header> tag.

Multiple classnames are separated by a space.

Classes (i.e. classnames) are used for styling the header element.

JavaScript uses classes to access one or more elements by classname.

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


Syntax

<header class="classnames">

Values

#

Value Description
classnames One or more space-separated class names.

More Examples

A class attribute styling a <header> element.
Clicking the button toggles a classname that changes the background and text colors.

Company logo here...

<style>
  .header-dark {background:#1f2936; color:white; padding:10px;}
  .header-indigo {background-color:#c6d2fe; color:black;}
</style>

<header id="myheader" class="header-dark">
    Company logo here...
</header>

<br/>
<button onclick="toggle();">Toggle class</button>

<script>
  let toggle = () => {
    let element = document.getElementById("myheader");
    element.classList.toggle("header-indigo");
  }
</script>

Code explanation

Two CSS classes are defined in the <style> element.

The class attribute in <header> assigns one classname.

Repeatedly clicking the button toggles another class, changing the background and text color of the <header>.


Browser support

Here is when class 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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