Radio button required

One input with required attribute is enough.

<form>
  Select Gender:

  <label><input type="radio" name="gender" value="male" required>Male</label>

  <label><input type="radio" name="gender" value="female">Female</label>

  <label><input type="radio" name="gender" value="other">Other</label>

  <input type="submit">
</form>

Source: stackoverflow.com

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