[cssom] Don't include properties that don't have a cascaded value in cascadedStyle.

Author: Simon Pieters

cssom/Overview.html

@@ -2816,9 +2816,9 @@ <h3 id="the-getstyleutils-interface"><span class="secno">7.3 </span>The <code ti
 <p class="atrisk">The <dfn id="dom-getstyleutils-cascadedstyle" title="dom-GetStyleUtils-cascadedStyle"><code>cascadedStyle</code></dfn> attribute must return a <a href="#css-declaration-block">CSS declaration block</a>
 with the <a href="#concept-css-declaration-block-readonly-flag" title="concept-css-declaration-block-readonly-flag">readonly flag</a> set and the
 <a href="#concept-css-declaration-block-declarations" title="concept-css-declaration-block-declarations">declarations</a> set to all longhand properties
-that are <a href="#supported-css-property" title="supported CSS property">supported CSS properties</a> with the value being the <a href="#cascaded-value">cascaded value</a>
-computed for the <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#context-object">context object</a> using the style rules associated
-with the <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#context-object">context object</a>'s <a href="#associated-document">associated document</a>.</p>
+that are <a href="#supported-css-property" title="supported CSS property">supported CSS properties</a> that have a <a href="#cascaded-value">cascaded value</a> for the <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#context-object">context
+object</a>, with the value being the <a href="#cascaded-value">cascaded value</a> computed for the <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#context-object">context object</a> using the style rules
+associated with the <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#context-object">context object</a>'s <a href="#associated-document">associated document</a>.</p>
 
 <!--<p class=atrisk>The <dfn title=dom-GetStyleUtils-defaultStyle><code>defaultStyle</code></dfn> attribute must return a <span>CSS declaration block</span> with
 the <span title=concept-css-declaration-block-readonly-flag>readonly flag</span> set and the

cssom/Overview.src.html

@@ -2738,9 +2738,9 @@ <h3>The <code title>GetStyleUtils</code> Interface</h3>
 <p class=atrisk>The <dfn title=dom-GetStyleUtils-cascadedStyle><code>cascadedStyle</code></dfn> attribute must return a <span>CSS declaration block</span>
 with the <span title=concept-css-declaration-block-readonly-flag>readonly flag</span> set and the
 <span title=concept-css-declaration-block-declarations>declarations</span> set to all longhand properties
-that are <span title="supported CSS property">supported CSS properties</span> with the value being the <span>cascaded value</span>
-computed for the <span data-anolis-spec=dom>context object</span> using the style rules associated
-with the <span data-anolis-spec=dom>context object</span>'s <span>associated document</span>.</p>
+that are <span title="supported CSS property">supported CSS properties</span> that have a <span>cascaded value</span> for the <span data-anolis-spec=dom>context
+object</span>, with the value being the <span>cascaded value</span> computed for the <span data-anolis-spec=dom>context object</span> using the style rules
+associated with the <span data-anolis-spec=dom>context object</span>'s <span>associated document</span>.</p>
 
 <!--<p class=atrisk>The <dfn title=dom-GetStyleUtils-defaultStyle><code>defaultStyle</code></dfn> attribute must return a <span>CSS declaration block</span> with
 the <span title=concept-css-declaration-block-readonly-flag>readonly flag</span> set and the