What child elements are valid inside of a <li>? [duplicate]

Question

Say I have

<li></li>

What are the rules when putting other tags inside of these? For instance

<li>Hello. <p>I am a paragraph</p></li>

or

<li>Hello. <span>I am a span</span></li>

What should be taken into consideration when doing this?

Answer 1

Both <p> & <span> are flow content, which is permitted as the child of an <li>, which means both are equally valid in HTML5.