Ben Edwards benedfit

Sass Dark/Light Theme Mixin

This is a Sass mixin to handle a 3-way dark mode. It relies on a data-theme attribute on your <html> element with a value of light or dark. If data-theme is absent (i.e. it's neither light nor dark), the system's preferred mode is used.

body {
  // matches data-theme="light" or data-theme="auto" with system instructing light mode
  @include light {
    background: white;
 color: black;

I've been finding this little meta[name='tmpl'] pattern useful lately when making template-based decisions in JS, such as when loading a particular file or set of files that are needed only on a particular page of a site.

First, in the HTML of a particular template, like say, a search result page:

<head>
  ...
  <meta name="tmpl" content="searchresult">
</head>

	$critical-css-only:true !default;
	@mixin critical($critical-only:true){
	@if (($critical-css-only and $critical-only) or (not $critical-css-only and not $critical-only)){
	@content;
	}
	}