:checked

A pseudo-class that targets checkboxes, radio buttons, or option elements that are currently selected (checked) by the user.

It is documented as part of the CSS Basic User Interface specification.

/* Usage Example */
input[type="checkbox"]:checked + label {
  /* Styles the label when its checkbox is checked */
  font-weight: bold;
  color: #059669;
}
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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