<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>test swicth img srcset</title>
</head>
<body>
<div class="box" style="width:100%">
<img src="./clock-demo-200px.png"
srcset="./espresso-vert.jpg 380w,
./espresso-neg.jpg 680w,
./espresso.jpg 990w" style="width:100%">
</div>
<div class="box" style="width:100%">
<picture style="max-width:100%">
<source media="(max-width: 799px)" srcset="./espresso-vert.jpg">
<source media="(min-width: 800px)" srcset="./espresso.jpg">
<img src="./espresso-vert.jpg" alt="">
</picture>
</div>
</body>
</html>