css pseudo class
`:focus` CSS pseudo-class
The :focus CSS pseudo-class represents an element (such as a form input) that has received focus. It is generally triggered when the user clicks or taps on an element or selects it with the keyboard’s Tab key.
label {
display: block;
margin-top: 1em;
}
input:focus {
background-color: lightblue;
}
select:focus {
background-color: ivory;
}
<form>
<p>Which flavor would you like to order?</p>
<label>Full Name: <input name="firstName" type="text" /></label>
<label
>Flavor:
<select name="flavor">
<option>Cherry</option>
<option>Green Tea</option>
<option>Moose Tracks</option>
<option>Mint Chip</option>
</select>
</label>
</form>
[!NOTE] This pseudo-class applies only to the focused element itself. Use
:focus-withinif you want to select an element that contains a focused element.
Syntax
:focus {
/* ... */
}
Accessibility
Make sure the visual focus indicator can be seen by people with low vision. This will also benefit anyone use a screen in a brightly lit space (like outside in the sun). WCAG 2.1 SC 1.4.11 Non-Text Contrast requires that the visual focus indicator be at least 3 to 1.
- Accessible Visual Focus Indicators: Give Your Site Some Focus! Tips for Designing Useful and Usable Focus Indicators
:focus { outline: none; }
Never just remove the focus outline (visible focus indicator) without replacing it with a focus outline that will pass WCAG 2.1 SC 1.4.11 Non-Text Contrast.
- Quick Tip: Never remove CSS outlines
Examples
HTML
<div><input class="red-input" value="I'll be red when focused." /></div>
<div><input class="blue-input" value="I'll be blue when focused." /></div>
CSS
.red-input:focus {
background: yellow;
color: red;
}
.blue-input:focus {
background: yellow;
color: blue;
}