In XHTML / HTML, which elements have semantic meaning, which are biased and which do not fall into both categories?

Question

In XHTML / HTML, which elements have semantic meaning that are presentation and that do not fall into both categories?

And who decides which tag is semantic, presentation? W3C or a web developer with their own terms?

What is the difference between structural and semantic markup?

Is DIV and not semantic, if so, why do we use?

Answer 1

(OL) (UL), , . , , - , , - . , .

, , ? W3C - ?

. , . , ( , ).

, , (X) HTML- ( ) CSS .

Answer 2

, , - , , "".

: :

<h1>Hey, I'm a title</h1>

<font size="36px">Hey, I'm a title</h1>

?

, - , , -, , .

Answer 3

. .

. <i> , <blockquote> <q> - .

, , , , , , - , .

<span> <div> , , - . CSS. , <span> <div> , , , , .