The class attribute assigns one or more classnames to the <samp> 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 <samp> element.
The program ran for 3.5 minutes. Here is the output:
*** The first 50 digits of pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 ***
<style>
.samp-class { color: teal; }
</style>
<p>The program ran for 3.5 minutes. Here is the output:</p>
<samp class="samp-class">
*** The first 50 digits of pi are: 3.1415926535 8979323846
2643383279 5028841971 6939937510 ***
</samp>
Classes (i.e. classnames) are used for styling the samp 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.
<samp class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling a <samp> element.
Clicking the button toggles a classname that boldens the sample text.
The program ran for 3.5 minutes. Here is the output:
*** The first 50 digits of pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 ***<style>
.teal { color: teal; }
.bold { font-weight:700; }
</style>
<p>The program ran for 3.5 minutes. Here is the output:</p>
<samp class="teal" id="mysamp">
*** The first 50 digits of pi are: 3.1415926535 8979323846
2643383279 5028841971 6939937510 ***
</samp>
<br />
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let element = document.getElementById("mysamp");
element.classList.toggle("bold");
}
</script>
Two CSS classes are defined in the <style> element.
The class attribute in <samp> assigns one classname.
Repeatedly clicking the button adds and removes the second class, toggling the boldness of the <samp>.
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 <samp>
