This is an important message requiring you to make a choice if you're based in the EU.
Learn how and why to use the !important rule in your CSS styles. See what cases are recommended and where is the right place to use it.
Make your website look more attractive by using favicons in the title bar. See how favicons are created and find more information about them.
A CSS comment is used to give explanatory information to the code or to prevent the browser from trying to interpret particular parts of the style sheet.
See how to use <video> and <iframe> tags instead of the <embed>, <frame> and <object> tags. Learn how to set video autoplay. Practice with examples.
Very often developers want to create a div element, that can change its width/height as the window width changes. That can be done by maintaining the aspect ratio of the element.
How CSS overriding works, what is the cascading order and inheritance, what are the priorities and some tricks to override them.
Learn about the ways of resizing and creating responsive background images. Use the CSS background-size property for that purpose. See examples.
Learn the ways of styling and have attractive horizontal lines: how to change color and size, set images as horizontal lines and a pack full of various kinds of <hr> examples.