Can tags have any type of tags inside them?

The span element is an inline element, which should contain only other inline elements and no block elements.

From the spec:

Generally, block-level elements may
contain inline elements and other
block-level elements. Generally,
inline elements may contain only data
and other inline elements. Inherent in
this structural distinction is the
idea that block elements create
“larger” structures than inline
elements.

The generic block-level grouping element is the div. The generic inline-level grouping element is the span.

Again, from the spec:

The DIV and SPAN elements, in
conjunction with the id and class
attributes, offer a generic mechanism
for adding structure to documents.
These elements define content to be
inline (SPAN) or block-level (DIV) but
impose no other presentational idioms
on the content.

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