I have a div inside the html's body,why is it when I set it's position to absolute I can set it's width/height using percentages?The parent element doesn't have any set width/height so where does the child element get it's reference size from?I have added my code bellow.
div {
position: absolute;
width: 80%;
height: 40%;
background-color: red;
}
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" type="text/css" href="wut.css">
</head>
<body>
<div>
</div>
</body>
</html>