/progressive-image>
    </article>

    <article>
      <h1>SVG placeholder</h1>
      <progressive-image savedata src="https://images.unsplash.com/photo-1504805572947-34fad45aed93?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=869&q=80">
        <svg xmlns="http://www.w3.org/2000/svg" width="434" height="289"></svg>
      </progressive-image>
    </article>

    <article>
      <h1>No <code>srcset</code> attribute</h1>
      <progressive-image src="https://images.unsplash.com/photo-1507506