sub
and sup
elementsHTMLElement
.The
sup
element represents
a superscript and the
sub
element represents
a subscript.
These elements must be used only to mark up typographical
conventions with specific meanings, not for typographical
presentation for presentation's sake. For example, it would be
inappropriate for the
sub
and
sup
elements to be used in the name of the LaTeX
document preparation system. In general, authors should use these
elements only if the absence of those elements would
change the meaning of the content.
In certain languages, superscripts are part of the typographical conventions for some abbreviations.
<p>The most beautiful women are <span lang="fr"><abbr>M<sup>lle</sup></abbr> Gwendoline</span> and <span lang="fr"><abbr>M<sup>me</sup></abbr> Denise</span>.</p>
The
sub
element can be used inside a var
element, for variables that have
subscripts.
Here, the
sub
element is used to represents the subscript that
identifies the variable in a family of variables:
<p>The coordinate of the <var>i</var>th point is (<var>x<sub><var>i</var></sub></var>, <var>y<sub><var>i</var></sub></var>). For example, the 10th point has coordinate (<var>x<sub>10</sub></var>, <var>y<sub>10</sub></var>).</p>
Mathematical expressions often use subscripts and superscripts.
Authors are encouraged to use MathML for marking up mathematics,
but authors may opt to use
sub
and
sup
if detailed mathematical markup is not desired.
[MATHML]
<var>E</var>=<var>m</var><var>c</var><sup>2</sup>
f(<var>x</var>, <var>n</var>) = log<sub>4</sub><var>x</var><sup><var>n</var></sup>