HTML <button> class Attribute

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



A class attribute styling a <button>.

  .teal {padding:10px;background:teal;color:white;}

<button class="teal"
        onclick="alert('Button was clicked!');">Clickable Button</button>

Using class

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

Multiple classnames are separated by a space.

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


<button class="classnames">



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

More Examples

A class attribute styling a <button> element.
Hover your mouse over the button changes the background color by toggling a classname.

  .bg-teal { background: teal; color:white; }
  .bg-rose { background-color: orangered; }

<button class="bg-teal" 
        onmouseleave="leave(this);">Clickable Button</button>

  let enter = button => button.classList.toggle("bg-rose");
  let leave = button => button.classList.toggle("bg-rose");

Code explanation

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

The class attribute in <button> assigns one classname.

Moving the mouse in and out the button toggles the second classname changing the button color.

Browser support

Here is when class support started for each browser:

1.0 Sep 2008
1.0 Sep 2002
1.0 Aug 1995
1.0 Jan 2006
1.0 Jan 2003

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