<label for="input1">spellcheck="true"</label>
<input type="text" id="input1" spellcheck="true">

<label for="input2">spellcheck="false"</label>
<input type="text" id="input2" spellcheck="false">
body {
  padding: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
}

input {
  width: 300px;
  margin-bottom: 15px;
}

External CSS

  1. https://codepen.io/denic/pen/YzyPzKG.css
  2. https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css

External JavaScript

  1. https://codepen.io/denic/pen/YzyPzKG.js