<p>In the <strong>Share</strong> panel</p>
<pre><code>paste HTML to embed in website
</code></pre>
<p>produces an <iframe> with scrolling attribute which is not supported in HTML5. "Use CSS instead."</p>
<p>Also looking in the browser console, we see</p>
<blockquote>
<p>embed-3828c...js:1 [Violation] Added non-passive event listener to a scroll-blocking 'wheel' event. Consider marking event handler as 'passive' to make the page more responsive. See <a href="https://www.chromestatus.com/feature/5745543795965952" rel="nofollow">https://www.chromestatus.com/feature/5745543795965952</a></p>
</blockquote>

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