Test Page
<html> <form id="calc-form">
<label> <input type="checkbox" class="calc-checkbox" value="10"> Option 1 </label>
<label> <input type="checkbox" class="calc-checkbox" value="20"> Option 2 </label>
<label> <input type="checkbox" class="calc-checkbox" value="30"> Option 3 </label>
Total: 0
</form> </html>