Editorial: rely on CSS Color to define sRGB

source

@@ -6171,8 +6171,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
   <!--en-GB--><h4 id="colours">Colors</h4>
 
   <p>A <!--en-GB--><dfn id="simple-colour">simple color</dfn> consists of three 8-bit numbers in the
-  range 0..255, representing the red, green, and blue components of the color respectively, in the
-  sRGB color space. <ref spec=SRGB></p>
+  range 0 to 255, inclusive, representing the red, green, and blue components of the color
+  respectively, in the <span>'srgb'</span> color space.</p>
 
   <p>A string is a <!--en-GB--><dfn id="valid-simple-colour">valid simple color</dfn> if it is
   exactly seven characters long, and the first character is a U+0023 NUMBER SIGN character (#), and
@@ -124214,9 +124214,6 @@ INSERT INTERFACES HERE
    <dt id="refsSTRUCTURED-FIELDS">[STRUCTURED-FIELDS]</dt>
    <dd><cite><a href="https://httpwg.org/http-extensions/draft-ietf-httpbis-header-structure.html">Structured Field Values for HTTP</a></cite>, M. Nottingham, P-H. Kamp. IETF.</dd>
 
-   <dt id="refsSRGB">[SRGB]</dt>
-   <dd><cite lang="en-GB"><a href="https://webstore.iec.ch/publication/6169">IEC 61966-2-1: Multimedia systems and equipment &mdash; Colour measurement and management &mdash; Part 2-1: Colour management &mdash; Default RGB colour space &mdash; sRGB</a></cite>. IEC.</dd>
-
    <dt id="refsSRI">[SRI]</dt>
    <dd><cite><a href="https://w3c.github.io/webappsec-subresource-integrity/">Subresource Integrity</a></cite>, D. Akhawe, F. Braun, F. Marier, J. Weinberger. W3C.</dd>