The class attribute assigns one or more classnames to the <dt> tag.
The text is italic.
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 a <dt> element with italic text.
<style>
.dt-italic { font-style: italic; }
</style>
<dl>
<dt class="dt-italic">Kunstmuseum</dt>
<dd>Basel, Switzerland</dd>
<dt class="dt-italic">National Gallery of Art</dt>
<dd>Washington DC, USA</dd>
<dt class="dt-italic">Musée d'Orsay</dt>
<dd>Paris, France</dd>
</dl>
Classes (i.e. classnames) are used for styling the dt 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.
<dt class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling a <dt> element. The text is italic.
Clicking the button toggles a classname that changes the background color for all <dt> elements.
<style>
.dt-italic { font-style:italic; }
.dt-lavender { background-color:lavender; }
</style>
<dl>
<dt class="dt-italic">1. Kunstmuseum</dt>
<dd>Basel, Switzerland</dd>
<dt class="dt-italic">2. National Gallery of Art</dt>
<dd>Washington DC, USA</dd>
<dt class="dt-italic">3. Musée d'Orsay</dt>
<dd>Paris, France</dd>
</dl>
<br/>
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let elements = document.getElementsByClassName("dt-italic");
[].forEach.call(elements, element => element.classList.toggle("dt-lavender"));
}
</script>
Two CSS classes are defined in the <style> element.
The class attributes assigned all <dt> elements one classname.
Clicking the button retrieves all <dt> elements using the classname.
JavaScript then iterates over the elements and toggles another class which changes the background color.
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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