The class attribute assigns one or more class names to the <iframe> tag.
Class names are defined in a stylesheet or in a local <style> element.
Classes, i.e. class names, are used to style elements.
A class attribute styling an <iframe> element.
<style>
.iframe {border:4px solid #258e94;height:450px;width:100%;}
</style>
<iframe class="iframe" src="https://www.wikipedia.org/wiki/Vincent_van_Gogh">
</iframe>
Classes (i.e. class names) are used for styling the iframe element.
Multiple class names are separated by a space.
JavaScript uses classes to access elements by classname.
Tip: class is a global attribute that can be applied to any HTML element.
<iframe class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling an <iframe> element.
Clicking the button toggles a classname that changes the border radius.
<style>
.iframe {border: 4px solid #258e94;height:450px;width:100%;}
.frame-rounded {border-radius: 50px;}
</style>
<iframe id="myiframe" class="iframe"
src="https://www.wikipedia.org/wiki/Vincent_van_Gogh">
</iframe>
<br/><br/>
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let element = document.getElementById("myiframe");
element.classList.toggle("frame-rounded");
}
</script>
Two CSS classes are defined in the <style> element.
The class attribute in <iframe> assigns one classname.
Repeatedly clicking the button toggles the second class, changing the border radius of the <iframe>.
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 |
Back to <iframe>
