<!DOCTYPE html>
<html>
<head>
<!-- Layout blocking CSS -->
<link rel="stylesheet" href="style1.css">
<link rel="stylesheet" href="style2.css">
<!-- JS in layout blocking phase -->
<script src="test1.js"></script>
<script src="test2.js"></script>
</head>
<body>
<script>
var resourcesNumber = -1;
window.onload = function () {
resourcesNumber = window.performance.getEntriesByType("resource").length;
};
function getResourceNumber() {
return new Promise(resolve => {
setInterval(function() {
if (resourcesNumber != -1) {
resolve(resourcesNumber);
}
}, 300);
});
}
function getResources() {
return window.performance.getEntriesByType("resource")
.map(e => JSON.stringify(e.toJSON())).join('|');;
}
</script>
<picture>
<source media="(min-width: 980px)" srcset="200.png">
<img src="400.png">
</picture>
<img srcset = "635.png 635w, 1270.png 1270w"
sizes = "(max-width: 600px) calc(100vw - 32px),
(max-width: 1000px) calc(66.67vw - 32px),
635px">
<img src="img1.png">
<img src="img2.png">
<img src="img3.png">
</body>
</html>
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