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Simple animated light and dark theme for any website inspired by Night Mode with Mix Blend Mode: Difference by @wgao19.
Please use the code as you wish. Tweet me @craigbuckler if you find it useful and donate toward development if you use it commercially.
- retains theme state between page loads
- no external dependencies - works with any framework
- fast and lightweight: 1,000 bytes of JavaScript, 330 bytes of CSS
- easy to configure in HTML and CSS
- works in all modern browsers
- fails gracefully in browsers without support
- includes toggled.js for simple UI toggle switching
(Note that some websites may have incompatible CSS or require changes to theme.css.)
The page must load the CSS and JavaScript. It can be placed anywhere but, typically, the CSS is loaded in the <head> and the JS is loaded just before the closing </body> tag:
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/theme.js/dist/theme.css">
<script src="https://cdn.jsdelivr.net/npm/theme.js/dist/theme.js"></script>CDN URLs are shown above but you can also npm i theme.js to install via npm and use a bundler.
Now create a theme toggle switch on your page by adding a data-toggled="themejs" attribute to any element, e.g.
<p data-toggled="themejs">theme</p>This can be styled however you prefer but it should be hidden by default and only shown then theme.js is active and a themejs-active class has applied to the body tag, e.g.
[data-toggled="themejs"] {
cursor: pointer;
display: none;
}
.themejs-active [data-toggled="themejs"] {
display: block;
}The element can now be clicked to toggle themes.
The following elements are added to the page so they can be altered as necessary:
body.themejs-active- applied when theme.js is supportedbody.themejs- the alternative theme has been applieddiv.themejs-back- background element, normally whitediv.themejs-overlay- background overlay, normally white but can be changed
Any elements that should not be reversed - such as images - should have the CSS isolation: isolate; property applied, e.g.
img, svg { isolation: isolate; }- toggled.js update
- initial release