<div class="layout">
  <div>
    <div class="frame no1">  
      <div>
        <!-- Code that matter -->
        <div class="element no1">1</div>
        <div class="element no2">2</div>
        <div class="element no3">3</div>
      </div>
    </div>
  </div>
  <!-- ========= -->
  <div>
    <div class="frame no2">
      <div>
        <!-- Code that matter -->
        <div class="element no1">1</div>
        <div class="element no2">2</div>
        <div class="element no3">3</div>
      </div>
    </div>
  </div>
</div>
.frame.no1 .element {
  display: block;
}

.frame.no2 .element {
  display: inline;
}

External CSS

  1. https://tim-montmorency.com/timdoc/shared/styles/codepen.css

External JavaScript

This Pen doesn't use any external JavaScript resources.