A simple function to defer css in your html tag.
<!--Using JsDeliver CDN-->
<script src="https://cdn.jsdelivr.net/npm/defer-css"></script>
<!-- Or Using UnPkg CDN-->
<script src="https://unpkg.com/defer-css"></script>
<!-- Or Using Bundle.run-->
<script src="https://bundle.run/defer-css"></script>
You can include using require or import but defer-css does not export anything.
It sets window.deferCss && window.deferCssData
By default defined styles are loaded before the first <link> element in your page
<html>
<head>
<!-- Styles will be placed before this link element-->
<link id="defer-css"/>
</head>
</html>
You can change this to your custom id
<head>
<link href="....">
<link href="....">
<link href="....">
<!-- Styles will be placed before this add-css-here element-->
<link id="add-css-here"/>
</head>
Load Css
deferCss([
{href: 'style-1.min.css', crossorign: 'anonymous'},
{href: 'style-2.min.css', crossorign: 'anonymous'}
], 'add-css-here')
Adds the following styles
<link rel="stylesheet" href="style-1.min.css" crossorigin="anonymous">
<link rel="stylesheet" href="style-2.min.css" crossorigin="anonymous">
If css object includes an onload function, it is executed when the css file is loaded.
deferCss([
{
href: 'style-1.min.css',
onload: function() {
// do something
}
},
])
Lets say you want to mount css in multiple places.
<head>
<link id="main-css"></main-css>
<link id="other-css"></other-css>
</head>
deferCss(['main-css-1.css', 'main-css-2.css'], 'main-css');
deferCss(['other-css-1.css', 'other-css-2.css'], 'other-css');
The deferCssData includes details you may need.
deferCssData = {
// Element mounted on, default = 'link'
link: {
total: 1, // total number of css loaded
loaded: 3
}
}
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Defer Css Test</title>
<script src="https://cdn.jsdelivr.net/npm/defer-css"></script>
<!-- Links are placed before this element -->
<add-css-here/>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-6 offset-md-3">
<div class="card shadow" style="margin-top: 20vh">
<div class="card-body text-center">
<h1>Hello, world!</h1>
<h5 class="text-primary">
Bootstrap Loaded with defer-css
</h5>
</div>
</div>
</div>
</div>
</div>
<script>
let scripts = [
{href: 'https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css'},
// Style with onload
{
href: './app.css',
onload: function () {
console.log(this.href + ' Style Loaded!');
// value of deferCssData
console.log(deferCssData);
}
},
];
// Defer scripts
deferCss(scripts, 'add-css-here');
</script>
</body>
</html>
FAQs
ExtraSlim Javascript to Load css in your page without affecting load speed.
We found that defer-css demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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