:marker pseudo element.
<details> <summary>What?</summary> Stay Home Stay Safe! </details>
I don't think this is as much of a big deal now but at one point there was a real security concern over using
target="_blank" and leaving yourself vulnerable to attacks.
<a href="<https://twitter.com/CollierAdam>" target="_blank" rel="noopener noreferrer" > DM me on Twitter. </a>