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[css-color-5] Define light-dark(). #9439

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Oct 4, 2023
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[css-color-5] Define light-dark(). #9439

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24 changes: 21 additions & 3 deletions css-color-5/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,8 @@ spec:css-color-4; type:value; text:srgb
spec:css-color-4; type:dfn; text:modern color syntax
spec:css-color-4; type:value; text:alpha-value
spec:css-values-5; type:value; text:color
spec:css-color-adjust-1; type:value; text:light
spec:css-color-adjust-1; type:value; text:dark
</pre>
<link rel="stylesheet" href="style.css" />
<style>
Expand Down Expand Up @@ -102,8 +104,8 @@ Introduction {#intro}
and two colors with visually different lightness,
like yellow and blue, can have the same HSL lightness).

This module adds a new function:
''color-mix()'',
This module adds the new functions
''color-mix()'' and ''light-dark()'',
and extends existing ones with [[#relative-colors|relative color syntax]].

It also extends the ''color()'' function
Expand All @@ -121,7 +123,7 @@ Introduction {#intro}
Colors in CSS are represented by the <dfn export><<color>></dfn> type:

<pre class='prod'>
&lt;color> = <<absolute-color-base>> | currentcolor | <<system-color>> | <<device-cmyk()>>
&lt;color> = <<absolute-color-base>> | currentcolor | <<system-color>> | <<device-cmyk()>> | <<light-dark()>>

<dfn>&lt;absolute-color-base></dfn> = <<hex-color>> | <<absolute-color-function>> | <<named-color>> | transparent
<dfn>&lt;absolute-color-function></dfn> = <<rgb()>> | <<rgba()>> |
Expand Down Expand Up @@ -2468,6 +2470,22 @@ or any other color or monochrome output device which has been characterized.
<li>alpha is the same as the input color
</ul>

<h2 id="light-dark">
Reacting to the used color-scheme: the ''light-dark()'' Function
</h2>

System colors have the ability to react to the current used ''color-scheme'' value.
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This should be "currently" instead of "current".

Sebastian

The ''light-dark()'' function exposes the same capability to authors.

<pre class='prod'>
<dfn export>light-dark()</dfn> = light-dark( <<color>>, <<color>> )
</pre>

This function computes to the computed value of the first color,
if the <a>used color scheme</a> is ''light'' or unknown,
or to the computed value of the second color,
if the <a>used color scheme</a> is ''dark''.

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