Similar to smart diacritics, `CO2` should become `CO<sub>2</sub>` and “CO2” to `Trademark®` `Trademark<sup>®</sup>`. Requested via the [WP.org support forums](https://wordpress.org/support/topic/smart-replace-sub-superscript/).
Similar to smart diacritics,
CO2should becomeCO<sub>2</sub>and “CO2” toTrademark®Trademark<sup>®</sup>. Requested via the WP.org support forums.