Dynamic Color Manipulation with CSS Relative Colors

In Michelle’s excellent Guide To Modern CSS Colors, I only found one thing missing: CSS Relative Colors. Plugging that hole is this post by Jim Nielsen.

CSS relative colors enable the dynamic color manipulation I’ve always wanted in vanilla CSS since Sass’ color functions first came on the scene (darken(), lighten(), etc.).

Allow me to explain a bit more about why I’m so excited.

:root {
  --color: #ff0000;
}

.selector {
  /* syntax: hsl(from var() h s l / alpha) */
  
  /* change the transparency */
  color: hsl(from var(--color) h s l / .5);
  
  /* change the hue */
  color: hsl(from var(--color) calc(h + 180deg) s l);
  
  /* change the saturation */
  color: hsl(from var(--color) h calc(s + 5%) l);
  
  /* change all of them */
  color: hsl(
    from var(--color)
    calc(h + 10deg)
    calc(s + 5%)
    calc(l - 10%)
    /
    calc(alpha - 15%)
  );
}

The CSS Relative Color Syntax is available in Safari ever since TP 122. Other vendors are still working on it. Relevant issues to follow:

Dynamic Color Manipulation with CSS Relative Colors →

Published by Bramus!

Bramus is a frontend web developer from Belgium, working as a Chrome Developer Relations Engineer at Google. From the moment he discovered view-source at the age of 14 (way back in 1997), he fell in love with the web and has been tinkering with it ever since (more …)

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