<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%;
}