When to use p with i tag?

<p><i>test</i></p>

<i>test</i>

When to use p with i tag? As p is text is must be used? If not? And also with span sub sup etc? What the reason take around a p tag or not?

Thanks

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Hello
this is a good and rich source to know wich tag you should use and when to use it.
https://www.w3schools.com/tags/tag_i.asp

Like you linked on all tutorial (demo text) have the extra tags like span sub sup tags inside a p tag. Still what the reason to use it or not :)?

Thanks

All this tags give meaning to the manipulated text inside a p tag or hx tag.
The <i> tag can be used to indicate a technical term, a phrase from another language, a thought, or a ship name, etc.
The <span> tag is used to group inline-elements in a document.
The <span> tag provides no visual change by itself.
The <span> tag provides a way to add a hook to a part of a text or a part of a document.
Tip: When a text is hooked in a <span> element, you can style it with CSS, or manipulate it with JavaScript.
The <sub> tag defines subscript text. Subscript text appears half a character below the normal line, and is sometimes rendered in a smaller font. Subscript text can be used for chemical formulas, like H2O

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