<label class="txt">
    <span class="txt-l">Default (filled)</span>
    <input type="text" value="Danielle Cage" placeholder="Full name" class="txt-f">
  </label>
<label class="txt">
    <span class="txt-l">Default (placeholder)</span>
    <input type="text" value="" placeholder="Your email address" class="txt-f">
  </label>
<label class="txt">
    <span class="txt-l">Small (filled)</span>
    <input type="text" value="Steve Rogers" placeholder="Full name" class="txt-f txt-f--sm">
  </label>
<label class="txt">
    <span class="txt-l">Small (placeholder)</span>
    <input type="text" value="" placeholder="Full name" class="txt-f txt-f--sm">
  </label>
<label class="txt">
    <span class="txt-l">Password</span>
    <input type="password" value="password" placeholder="" class="txt-f">
  </label>

Fleet supports creating form elements with explicit and implicit labels. The preferred use is to utilize explicit labelling if possible. According to the W3, explicit labelling is better supported by assistive technologies.