Day 22: the ::backdrop pseudo-element

posted on

It’s time to get me up to speed with modern CSS. There’s so much new in CSS that I know too little about. To change that I’ve started #100DaysOfMoreOrLessModernCSS. Why more or less modern CSS? Because some topics will be about cutting-edge features, while other stuff has been around for quite a while already, but I just have little to no experience with it.

You can use the ::backdrop pseudo-element to style the backdrop of modal dialogs and elements which have been placed in fullscreen mode using the Fullscreen API.

::backdrop {
  background-color: rgb(0 0 0 / 0.5);
}
yo!

You don't have to limit yourself to semi-transparent background color.

::backdrop {
  background: conic-gradient(red, orange, yellow, green, red);
  outline: 20px solid white;
  outline-offset: -20px;
}
yo!

See on CodePen

Further reading

Do you want to learn even more awesome CSS?

I'm running a workshop with my friends at Smashing Magazine in which I introduce you to the most useful modern features in CSS and show how you can implement them today in your code base to improve scalability, maintainability, and productivity.

Learn more about the workshop!

Overview: 100 Days Of More Or Less Modern CSS