[cssom-view] Remove a fingerprinting vector (colorDepth/pixelDepth). https://www.w3.org/Bugs/Public/show_bug.cgi?id=17522

Author: Simon Pieters

cssom-view/Overview.html

@@ -705,13 +705,12 @@ <h3 id="the-screen-interface"><span class="secno">5.2 </span>The <code title="">
 
 <p>The <dfn id="dom-screen-height" title="dom-Screen-height"><code>height</code></dfn> attribute must return the height of the output device.</p>
 
-<p>The <dfn id="dom-screen-colordepth" title="dom-Screen-colorDepth"><code>colorDepth</code></dfn> attribute must return the number of bits allocated to
-colors (i.e. excluding the alpha channel) for one device pixel in the output device. If no
-bits are allocated to colors in the output device this attribute
-must return zero.</p>
+<p>The <dfn id="dom-screen-colordepth" title="dom-Screen-colorDepth"><code>colorDepth</code></dfn> attribute must return 24.</p>
 
-<p>The <dfn id="dom-screen-pixeldepth" title="dom-Screen-pixelDepth"><code>pixelDepth</code></dfn> attribute must return the value returned by the
-<code title="dom-Screen-colorDepth"><a href="#dom-screen-colordepth">colorDepth</a></code> attribute.</p>
+<p>The <dfn id="dom-screen-pixeldepth" title="dom-Screen-pixelDepth"><code>pixelDepth</code></dfn> attribute must return 24.</p>
+
+<p class="note">The <code title="dom-Screen-colorDepth"><a href="#dom-screen-colordepth">colorDepth</a></code> and <code title="dom-Screen-pixelDepth"><a href="#dom-screen-pixeldepth">pixelDepth</a></code> attributes are useless but are
+included for compatibility.
 
 
 <h2 id="extensions-to-the-document-interface"><span class="secno">6 </span>Extensions to the <code title="">Document</code> Interface</h2>

cssom-view/Overview.src.html

@@ -667,13 +667,12 @@ <h3>The <code title>Screen</code> Interface</h3>
 
 <p>The <dfn title=dom-Screen-height><code>height</code></dfn> attribute must return the height of the output device.</p>
 
-<p>The <dfn title=dom-Screen-colorDepth><code>colorDepth</code></dfn> attribute must return the number of bits allocated to
-colors (i.e. excluding the alpha channel) for one device pixel in the output device. If no
-bits are allocated to colors in the output device this attribute
-must return zero.</p>
+<p>The <dfn title=dom-Screen-colorDepth><code>colorDepth</code></dfn> attribute must return 24.</p>
 
-<p>The <dfn title=dom-Screen-pixelDepth><code>pixelDepth</code></dfn> attribute must return the value returned by the
-<code title=dom-Screen-colorDepth>colorDepth</code> attribute.</p>
+<p>The <dfn title=dom-Screen-pixelDepth><code>pixelDepth</code></dfn> attribute must return 24.</p>
+
+<p class=note>The <code title=dom-Screen-colorDepth>colorDepth</code> and <code title=dom-Screen-pixelDepth>pixelDepth</code> attributes are useless but are
+included for compatibility.
 
 
 <h2>Extensions to the <code title>Document</code> Interface</h2>