p Display utilities are used for display and hidden things.

pre.code(data-lang='HTML')
  code
    :highlight(lang="html")
      <!-- display: block; -->
      <div class="d-block"></div>
      <!-- display: inline; -->
      <div class="d-inline"></div>
      <!-- display: inline-block; -->
      <div class="d-inline-block"></div>
      <!-- display: flex; -->
      <div class="d-flex"></div>
      <!-- display: inline-flex; -->
      <div class="d-inline-flex"></div>
      <!-- display: none; -->
      <div class="d-none"></div>
      <div class="d-hide"></div>
      <!-- visibility: visible; -->
      <div class="d-visible"></div>
      <!-- visibility: hidden; -->
      <div class="d-invisible"></div>
      <!-- hide text contents -->
      <div class="text-hide"></div>
      <!-- assistive text for screen reader -->
      <div class="text-assistive"></div>