Handling browser support

by Tim McKay

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date -->

<form>
  <div>
    <label for="bday">Enter your birthday:</label>
    <input type="date" id="bday" name="bday" required pattern="[0-9]{4}-[0-9]{2}-[0-9]{2}">
    <span class="validity"></span>
  </div>
  <div>
    <input type="submit">
  </div>
</form>

CSS

div {
  margin-bottom: 10px;
}

input:invalid + span {
  position: relative;
}

input:invalid + span:after {
  content: '✖';
  position: absolute;
  right: -18px;
}

input:valid + span {
  position: relative;
}

input:valid + span:after {
  content: '✓';
  position: absolute;
  right: -18px;
}