This library adds support of superscript and subscript (<sup> and <sub> HTML tags) to league/commonmark.

• 2.x is compatible with league/commonmark 1.x (recommended version)
• 1.x is compatible with league/commonmark 0.17.x and 0.18.x and will no longer be supported

This project can be installed via [Composer]:

$ composer require ows/commonmark-sup-sub-extensions

use League\CommonMark\Environment;
use Ows\CommonMark\SupExtension;
use Ows\CommonMark\SubExtension;

$environment = Environment::createCommonMarkEnvironment();
$environment->addExtension(new SupExtension());
$environment->addExtension(new SubExtension());

See CommonMark customization.

Code:

10^2^
10~2~

Result:

10<sup>2</sup>
10<sub>2</sub>