node_modules/material-design-lite/src/textfield/snippets/textfield-floating-text.html

<!-- Textfield with Floating Label -->

<form action="#">
  <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
    <input class="mdl-textfield__input" type="text" id="sample3">
    <label class="mdl-textfield__label" for="sample3">Text...</label>
  </div>
</form>