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picture_type_webp.html
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picture_type_webp.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>
Picture with type attribute in source to conditionally load WebP -
Lazyload demos
</title>
<style>
body {
margin: 0;
}
ul {
display: flex;
flex-wrap: wrap;
}
ul,
li {
list-style-type: none;
margin: 0;
padding: 0;
min-height: 160px;
}
a {
display: block;
position: relative;
padding-bottom: 100%;
outline: 1px solid gray;
}
img {
position: absolute;
top: 0;
left: 0;
display: block;
width: 100%;
height: auto;
min-width: 10px;
}
img:not([src]) {
visibility: hidden;
}
li {
width: 50%;
}
@media (min-width: 768px) {
li {
width: 33.3%;
}
}
@media (min-width: 1024px) {
li {
width: 25%;
}
}
/* Fixes Firefox anomaly during image load */
@-moz-document url-prefix() {
img:-moz-loading {
visibility: hidden;
}
}
</style>
</head>
<body>
<h1>
Picture with type attribute in source to conditionally load WebP demo
</h1>
<div id="results1" class="results">
<ul>
<li>
<a href="#1">
<picture>
<source
type="image/webp"
srcset="
https://via.placeholder.com/256.webp?text=256+WebP+Sneakers 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Sneakers 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Sneakers 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Sneakers 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Sneakers 960w
"
sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
src="https://via.placeholder.com/256.jpg?text=256+Jpg+Sneakers"
srcset="
https://via.placeholder.com/256.jpg?text=256+Jpg+Sneakers 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Sneakers 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Sneakers 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Sneakers 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Sneakers 960w
"
sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Sneakers"
/>
</picture>
</a>
</li>
<li>
<a href="#2">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+OpenToe 256w,
https://via.placeholder.com/320.webp?text=320+WebP+OpenToe 320w,
https://via.placeholder.com/512.webp?text=512+WebP+OpenToe 512w,
https://via.placeholder.com/640.webp?text=640+WebP+OpenToe 640w,
https://via.placeholder.com/960.webp?text=960+WebP+OpenToe 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+OpenToe"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+OpenToe 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+OpenToe 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+OpenToe 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+OpenToe 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+OpenToe 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Open Toe"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#3">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Stivali 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Stivali 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Stivali 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Stivali 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Stivali 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivali"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivali 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Stivali 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Stivali 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Stivali 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Stivali 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Stivali"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#4">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Stivaletti 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Stivaletti 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Stivaletti 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Stivaletti 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Stivaletti 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivaletti"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivaletti 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Stivaletti 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Stivaletti 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Stivaletti 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Stivaletti 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Stivaletti"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#5">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Decollete 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Decollete 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Decollete 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Decollete 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Decollete 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Decollete"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Decollete 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Decollete 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Decollete 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Decollete 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Decollete 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Decollete"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#6">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Ballerine 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Ballerine 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Ballerine 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Ballerine 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Ballerine 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Ballerine"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Ballerine 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Ballerine 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Ballerine 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Ballerine 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Ballerine 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Ballerine"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#7">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Sneakers+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Sneakers+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Sneakers+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Sneakers+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Sneakers+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Sneakers+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Sneakers+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Sneakers+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Sneakers+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Sneakers+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Sneakers+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Sneakers second"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#8">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+OpenToe+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+OpenToe+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+OpenToe+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+OpenToe+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+OpenToe+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+OpenToe+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+OpenToe+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+OpenToe+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+OpenToe+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+OpenToe+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+OpenToe+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Open Toe second"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#9">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Stivali+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Stivali+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Stivali+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Stivali+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Stivali+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivali+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivali+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Stivali+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Stivali+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Stivali+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Stivali+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Stivali second"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#10">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Stivaletti+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Stivaletti+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Stivaletti+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Stivaletti+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Stivaletti+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivaletti+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Stivaletti+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Stivaletti+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Stivaletti+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Stivaletti+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Stivaletti+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Stivaletti second"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#11">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Decollete+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Decollete+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Decollete+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Decollete+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Decollete+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Decollete+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Decollete+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Decollete+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Decollete+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Decollete+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Decollete+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Decollete second"
class="lazy"
/>
</picture>
</a>
</li>
<li>
<a href="#12">
<picture>
<source
type="image/webp"
data-srcset="https://via.placeholder.com/256.webp?text=256+WebP+Ballerine+2 256w,
https://via.placeholder.com/320.webp?text=320+WebP+Ballerine+2 320w,
https://via.placeholder.com/512.webp?text=512+WebP+Ballerine+2 512w,
https://via.placeholder.com/640.webp?text=640+WebP+Ballerine+2 640w,
https://via.placeholder.com/960.webp?text=960+WebP+Ballerine+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
/>
<img
data-src="https://via.placeholder.com/256.jpg?text=256+Jpg+Ballerine+2"
data-srcset="https://via.placeholder.com/256.jpg?text=256+Jpg+Ballerine+2 256w,
https://via.placeholder.com/320.jpg?text=320+Jpg+Ballerine+2 320w,
https://via.placeholder.com/512.jpg?text=512+Jpg+Ballerine+2 512w,
https://via.placeholder.com/640.jpg?text=640+Jpg+Ballerine+2 640w,
https://via.placeholder.com/960.jpg?text=960+Jpg+Ballerine+2 960w"
data-sizes="(min-width: 1024px) 25vw, (min-width: 768px) 33.3vw, 50vw"
alt="Ballerine second"
class="lazy"
/>
</picture>
</a>
</li>
</ul>
</div>
<script src="../dist/lazyload.min.js"></script>
<script>
(function () {
function logElementEvent(eventName, element) {
console.log(Date.now(), eventName, element.getAttribute("data-src"));
}
var callback_enter = function (element) {
logElementEvent("🔑 ENTERED", element);
};
var callback_exit = function (element) {
logElementEvent("🚪 EXITED", element);
};
var callback_loading = function (element) {
logElementEvent("⌚ LOADING", element);
};
var callback_loaded = function (element) {
logElementEvent("👍 LOADED", element);
};
var callback_error = function (element) {
logElementEvent("💀 ERROR", element);
element.src =
"https://via.placeholder.com/440x560/?text=Error+Placeholder";
};
var callback_finish = function () {
logElementEvent("✔️ FINISHED", document.documentElement);
};
var callback_cancel = function (element) {
logElementEvent("🔥 CANCEL", element);
};
ll = new LazyLoad({
// Assign the callbacks defined above
callback_enter: callback_enter,
callback_exit: callback_exit,
callback_cancel: callback_cancel,
callback_loading: callback_loading,
callback_loaded: callback_loaded,
callback_error: callback_error,
callback_finish: callback_finish
});
})();
</script>
</body>
</html>