1.1 --- a/css3-conditional/Overview.src.html Wed Feb 06 23:47:11 2013 -0800 1.2 +++ b/css3-conditional/Overview.src.html Wed Feb 06 23:47:55 2013 -0800 1.3 @@ -633,6 +633,17 @@ 1.4 then it <strong>must not</strong> 1.5 accept the declaration or claim support for it.</p> 1.6 1.7 +<p class="note">Note that properties or values 1.8 +whose support is effectively disabled by user preferences 1.9 +are still considered as supported by this definition. 1.10 +For example, if a user has enabled a high-contrast mode 1.11 +that causes colors to be overridden, 1.12 +the CSS processor is still considered to support the 'color' property 1.13 +even though declarations of the 'color' property may have no effect. 1.14 +On the other hand, a developer-facing preference 1.15 +whose purpose is to enable or disable support for an experimental CSS feature 1.16 +does affect this definition of support.</p> 1.17 + 1.18 <p>These rules (and the equivalence between them) allow 1.19 authors to use fallback (either in the [[CSS1]] sense of declarations 1.20 that are overridden by later declarations or with the new capabilities