<p>
  Use the <code>title</code> attribute on an <code>iframe</code> to clearly identify the content of the
  <code>iframe</code> to screen readers.
</p>

<iframe title="Wikipedia page for the HTML language" src="https://en.m.wikipedia.org/wiki/HTML"></iframe>
<iframe title="Wikipedia page for the CSS language" src="https://en.m.wikipedia.org/wiki/CSS"></iframe>

iframe {
  height: 200px;
  margin-bottom: 24px;
  width: 100%;
}