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.
Note: This pseudo-class applies only to the focused element itself. Use :focus-within
if you want to select an element that contains a focused element.
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.
<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>
.red-input:focus {
background: yellow;
color: red;
}
.blue-input:focus {
background: yellow;
color: blue;
}
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