Import resources.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Introducing resource practice</title>
<style>
/* When our screen is greater than or equal to 640px, we display 2 divs in one row*/
/* When our screen is smaller than 640px, we let the div display a row */
/* A suggestion: the best way for us to query media is from small to large */
</style>
<link rel="stylesheet" href="style320.css" media="screen and (min-width:320px)">
<link rel="stylesheet" href="style640.css" media="screen and (min-width:640px)">
</head>
<body>
<div>1</div>
<div>2</div>
</body>
</html>
style640.css:
div {
float: left;
width: 50%;
height: 100px;
}
div:nth-child(1) {
background-color: yellow;
}
div:nth-child(2) {
background-color: green;
}
style320.css:
div {
width: 100%;
height: 100px;
}
div:nth-child(1) {
background-color: yellow;
}
div:nth-child(2) {
background-color: green;
}
running result:
Screen below 640px:
Screen 640px and above: