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HTML

С label 

<form>
  <label><input type="checkbox" name="a" value="1">Checkbox 1</label>
  <label><input type="checkbox" name="a" value="2">Checkbox 2</label>
  <label><input type="checkbox" name="a" value="3">Checkbox 3</label>
</form>

Без label 

<form>
  <input type="checkbox" name="a" value="1">Checkbox 1
  <input type="checkbox" name="a" value="2">Checkbox 2
  <input type="checkbox" name="a" value="3">Checkbox 3
</form>