If we have an unordered list, the default is that there are bullets:
<ul>
<li>hello</li>
<li>world</li>
</ul>
However, if we make it display: flex, the bullet doesn't show any more:
li { display: flex }
<ul>
<li>hello</li>
<li>world</li>
</ul>
Is there such a rule in CSS because it might be natural still to show the bullet but let
ul { list-style-type: none; }
to control whether to show the bullets.