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[css-color-5] Change the computed value of light-dark() none from linear-gradient(transparent) to image(transparent) #13897

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Merged
tabatkins merged 2 commits into from
May 7, 2026
Merged

[css-color-5] Change the computed value of light-dark() none from linear-gradient(transparent) to image(transparent) #13897

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536e803
Change the computed value of `light-dark()` none from `linear-gradien…
yisibl May 7, 2026
986d44d
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tabatkins May 7, 2026
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17 changes: 9 additions & 8 deletions css-color-5/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -2808,15 +2808,10 @@ or any other color or monochrome output device which has been characterized.
if the <a>used color scheme</a> is ''light'' or unknown,
or the second image,
if the <a>used color scheme</a> is ''dark''.
The none keyword
produces a fully transparent image
with no natural size.

It is equivalent to a single-stop gradient whose stop color is ''transparent''':

<pre class="lang-css">
linear-gradient(transparent)
</pre>
The <dfn value for="light-dark()">none</dfn> keyword
computes to ''image(transparent)''
(a fully transparent image with no natural size).

<div class="example" id="ex-light-dark-color">
For example, to maintain a legible contrast on links,
Expand Down Expand Up @@ -2866,6 +2861,12 @@ or any other color or monochrome output device which has been characterized.
<pre class="lang-css">
background-image: light-dark(url(my-light-image.png), none);
</pre>

This is equivalent to:

<pre class="lang-css">
background-image: light-dark(url(my-light-image.png), image(transparent));
</pre>
</div>


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6 changes: 5 additions & 1 deletion css-images-4/Overview.bs
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Expand Up @@ -395,7 +395,11 @@ Image Fallbacks and Annotations: the ''image()'' notation {#image-notation}
one can use this as a simple way to "tint" a background image,
by overlaying a partially-transparent color over the top of the other image:

<pre class="lang-css">background-image: image(rgba(0,0,255,.5)), url("bg-image.png");</pre>
<pre class="lang-css">background-image: image(rgba(0, 0, 255, .5)), url("bg-image.png");</pre>

This is equivalent to a single color stop gradient:

<pre class="lang-css">background-image: linear-gradient(rgba(0, 0, 255, .5)), url("bg-image.png");</pre>

'background-color' does not work for this,
as the solid color it generates always lies <em>beneath</em> all the background images.
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6 changes: 5 additions & 1 deletion css-images-5/Overview.bs
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Expand Up @@ -201,7 +201,11 @@ Image Fallbacks and Annotations: the ''image()'' notation {#image-notation}
one can use this as a simple way to "tint" a background image,
by overlaying a partially-transparent color over the top of the other image:

<pre class="lang-css">background-image: image(rgba(0,0,255,.5)), url("bg-image.png");</pre>
<pre class="lang-css">background-image: image(rgba(0, 0, 255, .5)), url("bg-image.png");</pre>

This is equivalent to a single color stop gradient:

<pre class="lang-css">background-image: linear-gradient(rgba(0, 0, 255, .5)), url("bg-image.png");</pre>

'background-color' does not work for this,
as the solid color it generates always lies <em>beneath</em> all the background images.
Expand Down
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