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Posted on by Chris Coyier

Global CSS options with custom properties

With a preprocessor, like Sass, building a logical “do this or don’t” setting is fairly straightforward:

$option: false;

@mixin doThing {
  @if $option {
    do-thing: yep;
  }
}

.el {
  @include doThing;
}

Can we do that in native CSS with custom properties? Mark Otto shows that we can. It’s just a smidge different. 

html {
  --component-shadow: 0 .5rem 1rem rgba(0,0,0,.1);
}

.component {
  box-shadow: var(--component-shadow);
}

<!-- override the global anywhere more specific! like
     <div class="component remove-shadow">
     or
     <body class="remove-shadow"> -->
.remove-shadow {
  --component-shadow: none;
}

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