The class attribute assigns one or more classnames to the <ol> tag.
Classnames are defined in a stylesheet or in a local <style> element.
Classes, i.e. classnames, are used to style elements.
A class attribute styling an <ol> element.
<style>
.ol {
background: papayawhip;
padding: 20px 40px;
width: 220px;
border: 3px solid brown;
}
</style>
<ol class="ol">
<li>Amsterdam</li>
<li>London</li>
<li>Berlin</li>
<li>Paris</li>
</ol>
Classes (i.e. classnames) are used for styling the ol element.
Multiple classnames 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.
<ol class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling an <ol> element.
Clicking the button toggles a classname that adds a box shadow to the element.
<style>
.ol {
background: papayawhip;
padding: 20px 40px;
width: 220px;
border: 3px solid brown;
}
.ol-shadowed {
border: 0;
-webkit-box-shadow: 0px 0px 10px 2px rgba(0,0,0,0.2);
-moz-box-shadow: 0px 0px 10px 2px rgba(0,0,0,0.2);
box-shadow: 0px 0px 10px 2px rgba(0,0,0,0.2);
}
</style>
<ol id="myol" class="ol">
<li>Amsterdam</li>
<li>London</li>
<li>Berlin</li>
<li>Paris</li>
</ol>
<br />
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let element = document.getElementById("myol");
element.classList.toggle("ol-shadowed");
}
</script>
Two CSS classes are defined in the <style> element.
The class attribute in <ol> assigns one classname.
Repeatedly clicking the button toggles another class, adding or removing a box shadow to the <ol> element.
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 <ol>
