The class attribute assigns one or more classnames to the <strong> 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 a <strong> element.
Homework is due on March 11.
<style>
.strong { color: teal; }
</style>
<p>
Homework is due on <strong class="strong">March 11</strong>.
</p>
Classes (i.e. classnames) are used for styling the strong 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.
<strong class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling a <strong> element.
Clicking the button toggles a classname that changes the text color.
Homework is due on March 11.
<style>
.strong { color: teal; }
.strong-tomato { color: tomato; }
</style>
<p>
Homework is due on
<strong id="mystrong" class="strong">March 11</strong>.
</p>
<br />
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let element = document.getElementById("mystrong");
element.classList.toggle("strong-tomato");
}
</script>
Two CSS classes are defined in the <style> element.
The class attribute in <strong> assigns one classname.
Repeatedly clicking the button toggles another class, changing the strong text 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 |
Back to <strong>
