Clarify that semi-transparency is preserved

index.html

@@ -2599,7 +2599,7 @@ <h3>
           </dt>
           <dd>
             A user agent can present this icon where an icon with a
-            <a>solid color</a> is needed. The
+            <a>single color</a> is needed. The
             color information in the icon is discarded and only the alpha data
             is used.
           </dd>
@@ -2739,7 +2739,7 @@ <h2>
         </p>
         <p>
           If the icon contains transparent pixels, the user agent MUST
-          composite the icon onto a solid color (eg. white) of the user agent's
+          composite the icon onto a single color (eg. white) of the user agent's
           choice.
         </p>
         <p class="note">
@@ -2841,10 +2841,10 @@ <h2 class="icon-title">
       </section>
       <section>
         <h2>
-          Solid color icons
+          Single color icons
         </h2>
         <p>
-          Some platforms enforce that icons be displayed with a <dfn>solid
+          Some platforms enforce that icons be displayed with a <dfn>single
           color</dfn>, where only the transparency of the icon can be
           controlled. As web applications need to across multiple
           platforms, it is possible to indicate that an icon can have a
@@ -2854,15 +2854,12 @@ <h2>
           padding in different places throughout the platform.
         </p>
         <p>
-          When processing a <a>single-color</a> icon, the user agent MUST NOT use
-          the red component, green component, or blue component of a pixel. If
-          it has alpha equal to zero, the user agent SHOULD NOT display it.
-          If it the alpha component is greater than zero, the user agent SHOULD
-          display it with any tint.
-        </p>
-        <p>
-          If no single color icon is defined when an icon with a solid color is
-          expected to be presented, the user agent MAY show a fallback icon.
+          When processing a <a>single-color</a> icon, the user agent MUST NOT
+          use the red component, green component, or blue component of a pixel.
+          The user agent SHOULD display each pixel with its original alpha
+          value, but with a red, green, and blue value of the user agent's
+          choosing. It is RECOMMENDED that the user agent use the same color
+          value for all pixels.
         </p>
         <p class="note">
           Designers of <a>single-color</a> icons are recommended to set all
@@ -2878,7 +2875,7 @@ <h2>
         </p>
         <section>
           <h3>
-            Example usage of solid color icons
+            Example usage of single color icons
           </h3>
           <h2 class="icon-title">
             Usage examples