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HTML 

              
                
<h1>Pay your bill</h1
<form aria-label="Pay your bill">
  <fieldset>
    <legend>
      Select an amount
    </legend>
    <ul>
      <li>
        <label for="alpha" class="checkbox">
          <input type="checkbox" name="options" id="alpha" value="full">
          Pay in full: $386.00
        </label>      
      </li>
      <li>
        <div  id="bravo-label" class="checkbox label">
          <input aria-label="Other amount" type="text" placeholder="Other Amount" id="other-amount" />
        </div>      
      </li>
    </ul>
  </fieldset>

  <button class="submit" disabled>
    Pay my bill
  </button>
</form>


<h2>Why mostly this works, but is quite complicated</h2>

<p>It looks like radio buttons, but there is really only one checkbox to check "Pay in Full"</p>

<p>Everything else is smoke and mirrors that you have to explain to your developers.</p>

<p>The second "radio button" is only an input. On entering an Other amount, the Pay in Full checkbox is unchecked.</p>

<p>We have to differentiate between keyboard focus and mouse clicks now.</p>

<p>Let's say that you deliver this, extensive annotations and work with the dev team to get this right. What are the chances a new developer will be able to add another "Pay minimum" option without breaking the UX?</p>
!

CSS 

              
                *:focus {
  outline-offset: 4px;
}

$icon-checkbox: "data:image/svg+xml,%0A%3Csvg height='100px' width='100px' fill='white' xmlns='http://www.w3.org/2000/svg' viewBox='0 0 22 20' x='0px' y='0px'%3E%3Ctitle%3Echeckmark%3C/title%3E%3Cg data-name='Layer 2'%3E%3Cg data-name='Layer 1'%3E%3Cpath d='M22.76,1.34l-2.15,2c-.68.72-1.39,1.4-2,2.13a46.43,46.43,0,0,0-3.65,4.56A36.5,36.5,0,0,0,12,15a26.45,26.45,0,0,0-1.1,2.59c-.16.44-.3.87-.43,1.31a9.59,9.59,0,0,0-.27,1.19L6.27,20v0a3.62,3.62,0,0,0-.08-.51A5.83,5.83,0,0,0,6,18.84a12.41,12.41,0,0,0-.48-1.37,18.5,18.5,0,0,0-1.43-2.66,23.55,23.55,0,0,0-1.88-2.49C1.54,11.53.78,10.78,0,10l.54-.7.54-.7.46.3c.79.54,1.56,1.1,2.3,1.71A24.7,24.7,0,0,1,6.38,13a23.63,23.63,0,0,1,1.66,2c.3-.58.63-1.15,1-1.71a40.22,40.22,0,0,1,3.67-5A47.16,47.16,0,0,1,17,3.88c.74-.7,1.54-1.34,2.31-2l.05,0L21.68,0l.54.67Z'%3E%3C/path%3E%3C/g%3E%3C/g%3E%3C/svg%3E";


html {
  background-color: #eee;
  font-family: arial;
}
body {
  max-width: 420px;
  margin: 0px auto;
}

ul, li {
  list-style-type: none;
  margin: 0;
  padding: 0;
}



fieldset {
  border: none;
  padding: 0;
}
legend {
  font-weight: bold;
  margin-bottom: .5rem;
}

input[type=text] {
  font-size: 1rem;
  line-height: 1rem;
  padding: .25rem;
  border: 1px solid #777;
  border-radius: 2px;
}

// Place the checkbox on top of the pseudo checkbox to account for dragging in VO/Talkback
input[type=checkbox] {
  width: 1.5rem;
  height: 1.5rem;
  cursor: pointer;
  opacity: 0;
  grid-column: 1;
  grid-row: 1;
}

label.checkbox,
.checkbox {
  display: grid;
  grid-template-columns: 3rem 1fr;
  padding: 1rem;
  align-items:  center;
  margin-bottom: .25rem;
  background: #fff;
  line-height: 2rem;
  border-radius: .5rem;
  cursor: pointer;
  text-align: right;
  
  &:before {
    content: '';
    display: block;
    height: 1.5rem;
    width: 1.5rem;
    border-radius: 1.5rem;
    grid-column: 1;
    border: 2px solid #2978F6;
    grid-row: 1;
  }
  
  &:has(input[type=checkbox]:checked),
  &.checked {
    &:before {
      background-color: #2978F6;
      background-position: center center;
      background-size: 80% 80%; 
      background-repeat: no-repeat;
      box-shadow: inset 0 0 0 .25rem #fff;
    }
  }
  &:has(input[type=checkbox]:focus-visible) {
    &:before {
      outline: 2px solid #2978F6;
      outline-offset: 1px;
    }
  }
}

button {
  padding: 1rem 2rem;
  font-size: 1rem;
  color: #fff;
  line-height: 2rem;
  font-weight: bold;
  margin-top: 1rem;
  background: #2978F6;
  border: none;
  border-radius: 3rem;
  transition: .2s;
  cursor: pointer;
  
  &:active {
    background: #1F5EC1;
  }
  
  &:disabled {
    background: #999;
  }
}

input {
  text-align: right;
  width: 8rem;
  display: inline-block;
  place-self: end;
}
!

JS 

              
                function checkOtherAmount() {
  if ($("input#other-amount").is(":placeholder-shown")) {
    // The placeholder is displayed
    $(".submit").attr('disabled', 'disabled'); // Disable submit
  } else {
    // The placeholder is not displayed
    $(".submit").removeAttr('disabled'); // Field has value
  }
}

// If other amount field is clicked, change radio choice
$('#other-amount, #bravo-label').click(function() {
  $('#alpha').prop('checked', false);
  $('#other-amount').focus(); // Focus the input field
  checkOtherAmount() 
  if( !$('#bravo-label').hasClass('checked')) {
    $('#bravo-label').addClass('checked');  
  }
});

// On starting to type, enable the submit button
$('input#other-amount').keypress(function() {
  checkOtherAmount();
  $('#alpha').prop('checked', false);
  
  if( !$('#bravo-label').hasClass('checked')) {
    $('#bravo-label').addClass('checked');  
  }

});

$('input[id="alpha"]').on('change', function() {
  // If alpha is UNchecked, check the Other
  if ( !$("input#alpha").is(":checked")) {
    $('#bravo-label').addClass('checked');
  } else {
    $('#bravo-label').removeClass('checked');
    $('#other-amount').val(''); // Empty other amount
    $(".submit").removeAttr('disabled'); // Field has value
  }  
});


$(".submit").click(function() {
  alert("Great success");
});
!
999px

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