Trucos CSS
CSS Trick

Dynamic Form Labels with :has()

Auto-add asterisks to required fields and '(optional)' to optional ones.

#css #forms #has-selector #accessibility

Browser Support

✓ Chrome 105+ ✓ Firefox 121+ ✓ Safari 15.4+ ✗ Edge

Dynamic Form Labels

Use :has() to automatically mark required and optional fields.

label:has(+ input:required)::after {
  content: " *";
  color: red;
}


label:has(+ input:optional)::after {
  content: " (optional)";
  color: #777;
}

Live Demo

Auto Labels
:has()
#ef4444
#888888
CSS Code
.form-demo {
display: flex;
flex-direction: column;
gap: 0.75rem;
width: 100%;
max-width: 260px;
}
.form-field {
display: flex;
flex-direction: column;
gap: 0.25rem;
}
.form-label {
font-size: 0.875rem;
}
.form-label:has(+ input:required)::after {
content: " *";
color: #ef4444;
}
.form-label:has(+ input:not([required]))::after {
content: " (optional)";
color: #888888;
font-size: 0.75rem;
}
.form-input {
width: 100%;
padding: 0.5rem;
border-radius: 0.375rem;
border: 1px solid rgba(139, 92, 246, 0.3);
background: rgba(255, 255, 255, 0.05);
color: inherit;
font-size: 0.875rem;
}
.form-input:focus {
outline: 2px solid rgba(139, 92, 246, 0.5);
outline-offset: 2px;
}

Labels are auto-generated based on input’s required attribute - no manual markup needed.

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