Advanced text semantics

Let's start with a quote:

HTML, Hypertext Markup Language is by default accessible, if used correctly.

CSS, Cascading Style Sheets, can also be used to make web pages more, or less, accessible.

Chemical Formulae: H₂O (Water), C₂H₆O (Ethanol).

Dates: December 25^th 2019 (Christmas Day), November 2^nd 2019 (Día de los Muertos).