Writing HTML Markup
HTML stands for Hypertext Markup Language. It is a language that allows content to be marked up in a manner that makes it more understandable to technology, and then in turn to humans.
It's a common misconception that HTML is the easy part of authoring web pages and applications. Writing HTML is often dismissed out of hand as something anyone can do easily. My experience tells me HTML is easy to get wrong and not a lot else.
Also consider that for users of the web without sight or who have impaired vision, the way you author HTML can turn content from a confusing unusable mess, into a meaningful, useful, and delightful ...