<sub> for superscript
<sub> element denotes subscripts.
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
x<sub>10</sub> is the 10<sup>th</sup>.
</body>
</html>
<sub> element denotes subscripts.
<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
x<sub>10</sub> is the 10<sup>th</sup>.
</body>
</html>