For a video-based intro check out this HTML/CSS/JS Crash Course on YouTube. ... check out this HTML/CSS course. 2.1. Syntax. HTML provides tags that are used to create elements on a rendered webpage.

CSS: Enter CSS to be applied to the HTML used in your tests. It is placed between <style> elements in the header portion of the page. HTML: This area allows you to enter HTML to be used in your tests.