HTML <object> class Attribute

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

Example

#

A class attribute styling an embedded <object> element.

Object element is not supported.
<style>
  .object-border { border: 5px solid #4238ca; padding:5px; width:100%;height:550px;}
</style>

<object class="object-border" data="/media/sample.pdf" type="application/pdf">
     Object element is not supported.
</object>

Using class

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

Multiple classnames are separated by a space.

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

<object class="classnames">

Values

#

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

More Examples

A class attribute styling an embedded <object> element.
Clicking the button toggles a classname that changes the border color.

Object element is not supported.

<style>
  .object-indigo { border: 5px solid #4238ca; padding:5px; width:100%;height:550px; }
  .border-rose { border-color: #f87171; }
</style>

<object id="myobject" class="object-indigo" 
        data="/media/sample.pdf" type="application/pdf">
     Object element is not supported.
</object>

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

<script>
  let toggle = () => {
    let element = document.getElementById("myobject");
    element.classList.toggle("border-rose");
  }
</script>

Code explanation

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

The class attribute in <object> assigns one classname.

Repeatedly clicking the button toggles another class, changing the color of the <object> border.


Browser support

Here is when class 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

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