added release note for display-p3-linear color space (#42004)

* added release note for display-p3-linear color space

* Update files/en-us/mozilla/firefox/releases/146/index.md

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

* Update files/en-us/mozilla/firefox/releases/146/index.md

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

* Update files/en-us/mozilla/firefox/releases/146/index.md

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

---------

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

Author: dletorey

files/en-us/mozilla/firefox/releases/146/index.md

@@ -34,10 +34,13 @@ Firefox 146 is the current [Beta version of Firefox](https://www.firefox.com/en-
 
 ### CSS
 
-- The {{cssxref("color_value/contrast-color()")}} [CSS function](/en-US/docs/Web/CSS/Reference/Values/Functions) is now supported. This function takes a {{cssxref("color_value","color")}} value and returns a contrasting color that ensures at least [WCAG AA minimum contrast](https://w3c.github.io/wcag/guidelines/22/#contrast-minimum).
+- The {{cssxref("color_value/contrast-color()")}} function is now supported. This function takes a [`<color>`](/en-US/docs/Web/CSS/Reference/Values/color_value) value and returns a contrasting color that ensures at least [WCAG AA minimum contrast](https://w3c.github.io/wcag/guidelines/22/#contrast-minimum).
   ([Firefox bug 1682439](https://bugzil.la/1682439)).
 
-- The {{cssxref("text-decoration-inset")}} property is now supported, which enables adjusting the start and end points of an element's {{cssxref("text-decoration")}} so it can be shortened, lengthened, or have its position shifted with respect to the rendered text.
+- The [`<color>`](/en-US/docs/Web/CSS/Reference/Values/color_value) data type now supports the `display-p3-linear` color space. This space is similar to [`display-p3`](/en-US/docs/Glossary/Color_space#display-p3), except that it uses a linear-light transfer function and has no gamma-encoding, which allows for a higher precision in the colors displayed.
+  ([Firefox bug 1996318](https://bugzil.la/1996318)).
+
+- The [`text-decoration-inset`](/en-US/docs/Web/CSS/Reference/Properties/text-decoration-inset) property is now supported, which enables adjusting the start and end points of an element's {{cssxref("text-decoration")}} so it can be shortened, lengthened, or have its position shifted with respect to the rendered text.
   ([Firefox bug 1979915](https://bugzil.la/1979915), [Firefox bug 1997157](https://bugzil.la/1997157), [Firefox bug 1993043](https://bugzil.la/1993043)).
 
 - The {{cssxref("@scope")}} [at-rule](/en-US/docs/Web/CSS/Guides/Syntax/At-rules) is now supported by default. This enables you to select elements in specific DOM subtrees, targeting elements precisely without writing overly-specific selectors that are hard to override, and without coupling your selectors too tightly to the DOM structure. ([Firefox bug 1991105](https://bugzil.la/1991105)).