On publish.twitter.com, I want to create one of these embeds:
which gives this line of code:
<a class="twitter-timeline" href="https://twitter.com/LikkanChung">Tweets by LikkanChung</a> <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
which gives this link:

I know because it’s an <a> tag, it is making an link, but why isn’t the graphical tweets embed?
Have I missed something in my html doc?
Thanks