The class attribute assigns one or more classnames to the <input> 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 text <input> element.
<style>
.teal {border:5px dotted teal;background-color:#eafafb;}
</style>
<input type="text" value="Suzy Lee" class="teal">
Classes (i.e. classnames) are used for styling the input 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.
<input class="classnames">
| Value | Description |
|---|---|
| classnames | One or more space-separated class names. |
A class attribute styling a text <input> element.
Clicking this button toggles a classname that changes the border and background colors.
<style>
.teal {border:5px dotted teal;background-color:#eafafb;}
.indigo {border:5px dotted #4e46e5;background-color:#edf2ff;}
</style>
<input type="text" id="myinput" value="Suzy Lee" class="teal">
<br />
<button onclick="toggle();">Toggle class</button>
<script>
let toggle = () => {
let element = document.getElementById("myinput");
element.classList.toggle("indigo");
}
</script>
Two CSS classes are defined in the <style> element.
The class attribute in <input> assigns one classname.
Repeatedly clicking the button toggles another class, changing the background and text color of the <input> button.
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 |
