HTML and CSS codes you may not have seen before!

First up, the double-lined commenting code. Works with any coding language. The double-lined commenting code is when you start a commenting line and you want to expand it.
/*
*/
Here is an animation code. Only works with CSS. Animation codes are codes that animate your result in your script.
p{
color: lime;
font-family: "Courier";
font-size: 20px;
margin: 10px 0 0 10px;
white-space: nowrap;
overflow: hidden;
width: 30em;
animation: type 4s steps(60, end);
}
That's all, folks!