div id="extension-description">
  <h2>loader</h2>
  <p>
    This extension applies a <code>.loader</code> CSS class to the target
    element when a request starts, to indicate loading state.
  </p>
</div>

<div id="content">
  <a href="content.html#content" target="htmz">Load content</a>
</div>

<style>
  .loader {
    width: 2rem;
    height: 2rem;
    border: 0.25rem solid #f80;
    border-bottom-color: transparent;
    border-radius: 50%;
    box-sizing: border-box;
    animation: loader 1s linear infin