It is possible just write subscript or superscript level means subscript within subscript.
<!DOCTYPE html>
<html>
<body>
<h1>The sub and sup elements</h1>
<p>This text contains <sub>subscript<sub>a</sub></sub> text.</p>
</body>
</html>
another example a<sub>b<sub>c</sub></sub> - useful to math calculation
(a2)2 suppose this is mathematics format - <div>(a<sup>2<sup>)<sup>2</sup></div>
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