revision:
The <small> tag defines smaller text (like copyright and other side-comments).
This tag is not deprecated, but it is possible to achieve richer (or the same) effect with CSS. The <small> HTML element represents side-comments and small print, like copyright and legal text, independent of its styled presentation. By default, it renders text within it one font-size smaller, such as from small to x-small.
<small> . . . </small>
This is some normal text.
This is some smaller text.
<p class="spec-1">This is some normal text.</p>
<p class="spec-1"><small>This is some smaller text.</small></p>
This is the first sentence. This whole sentence is in small letters.
<p class="spec-1">This is the first sentence.
<small>This whole sentence is in small letters. small>
</p>