Gloss the CSS term "used value"

PR: #759

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@@ -3391,6 +3391,10 @@ a.setAttribute('href', 'http://example.com/'); // change the content attribute d
     <p>The term <dfn data-noexport="">CSS styling attribute</dfn> is defined in the <cite>CSS Style
     Attributes</cite> specification. <ref spec=CSSATTR></p>
 
+    <p>The term <dfn data-noexport=""
+    data-x-href="https://drafts.csswg.org/css-cascade/#used-value">used value</dfn> is defined in
+    the <cite>CSS Cascading and Inheritance</cite> specification. <ref spec=CSSCASCADE></p>
+
     <p>The <code>CanvasRenderingContext2D</code> object's use of fonts depends on the features
     described in the CSS <cite>Fonts</cite> and <cite>Font Loading</cite> specifications, including
     in particular <dfn data-noexport=""><code>FontFace</code></dfn> objects and the <dfn
@@ -57025,12 +57029,12 @@ dictionary <dfn>RelatedEventInit</dfn> : <span>EventInit</span> {
 
   <p>When an element <var>subject</var> is placed in <span>centered alignment</span> mode,
   and when it is in that mode and has new rendering boxes created, the user agent must set up the
-  element such that its top static position, for the purposes of calculating the used value of the
-  'top' property, is the value that would place the element's top margin edge as far from the top of
-  the <span>viewport</span> as the element's bottom margin edge from the bottom of the
-  <span>viewport</span>, if the element's height is less than the height of the
-  <span>viewport</span>, and otherwise is the value that would place the element's top margin edge
-  at the top of the <span>viewport</span>.</p>
+  element such that its top static position, for the purposes of calculating the
+  <span>used value</span> of the 'top' property, is the value that would place the element's top
+  margin edge as far from the top of the <span>viewport</span> as the element's bottom margin edge
+  from the bottom of the <span>viewport</span>, if the element's height is less than the height of
+  the <span>viewport</span>, and otherwise is the value that would place the element's top
+  margin edge at the top of the <span>viewport</span>.</p>
 
   <p>If there is a <code>dialog</code> element with <span>centered alignment</span> and that is
   <span>being rendered</span> when its <span>browsing context</span> changes <span>viewport</span>
@@ -57039,9 +57043,9 @@ dictionary <dfn>RelatedEventInit</dfn> : <span>EventInit</span> {
 
   <p>This top static position of a <code>dialog</code> element with <span>centered alignment</span>
   must remain the element's top static position until its boxes are recreated. (The element's static
-  position is only used in calculating the used value of the 'top' property in certain situations;
-  it's not used, for instance, to position the element if its 'position' property is set to
-  'static'.)</p>
+  position is only used in calculating the <span>used value</span> of the 'top' property in certain
+  situations; it's not used, for instance, to position the element if its 'position' property is set
+  to 'static'.)</p>
 
   <p>When a user agent is to <dfn>set up the position</dfn> of an element <var>subject</var> using an anchor <var>anchor</var>, it must run the following
   steps:</p>
@@ -64305,8 +64309,8 @@ v6DVT (also check for '- -' bits in the part above) -->
    let <var>region</var> be that <span>hit region's parent</span>, and return to the step
    labeled <i>loop</i>.</p></li>
 
-   <li><p>Otherwise, return the used value of the 'cursor' property for the <code>canvas</code>
-   element, if any; if there isn't one, return 'auto'. <ref spec=CSSUI></p></li>
+   <li><p>Otherwise, return the <span>used value</span> of the 'cursor' property for the
+   <code>canvas</code> element, if any; if there isn't one, return 'auto'. <ref spec=CSSUI></p></li>
 
   </ol>
 
@@ -107027,11 +107031,12 @@ document.body.appendChild(text);
   <p>When a user agent is to <dfn>align descendants</dfn> of a node, the user agent is expected to
   align only those descendants that have both their 'margin-left' and 'margin-right' properties
   computing to a value other than 'auto', that are over-constrained and that have one of those two
-  margins with a used value forced to a greater value, and that do not themselves have an applicable
-  <code data-x="">align</code> attribute. When multiple elements are to <span
+  margins with a <span>used value</span> forced to a greater value, and that do not themselves have
+  an applicable <code data-x="">align</code> attribute. When multiple elements are to <span
   data-x="align descendants">align</span> a particular descendant, the most deeply nested such
   element is expected to override the others. Aligned elements are expected to be aligned by having
-  the used values of their left and right margins be set accordingly.</p>
+  the <span data-x="used value">used values</span> of their left and right margins be set
+  accordingly.</p>
 
 
 
@@ -107358,8 +107363,8 @@ br[clear=all i], br[clear=both i] { clear: both; }</pre>
   element's 'color' property to the resulting colour.</p>
 
   <p id="the-font-element-text-decoration-color-quirk">The <code>font</code> element is expected to
-  override the color of any text decoration that spans the text of the element to the used value of
-  the element's 'color' property.</p>
+  override the color of any text decoration that spans the text of the element to the
+  <span>used value</span> of the element's 'color' property.</p>
 
   <p>When a <code>font</code> element has a <code data-x="attr-font-face" undefined>face</code>
   attribute, the user agent is expected to treat the attribute as a <span data-x="presentational
@@ -108652,8 +108657,8 @@ input[type=range i] { binding: <i>input-range</i>; }</pre>
   <p>Predefined suggested values (provided by the <code data-x="attr-input-list">list</code>
   attribute) are expected to be shown as tick marks on the slider, which the slider can snap to.</p>
 
-  <p>User agents are expected to use the used value of the 'direction' property on the element to
-  determine the direction in which the slider operates. Typically, a left-to-right ('ltr')
+  <p>User agents are expected to use the <span>used value</spam> of the 'direction' property on the
+  element to determine the direction in which the slider operates. Typically, a left-to-right ('ltr')
   horizontal control would have the lowest value on the left and the highest value on the right, and
   vice versa.</p>
 
@@ -116552,6 +116557,9 @@ INSERT INTERFACES HERE
    <dt id="refsCSSATTR">[CSSATTR]</dt>
    <dd><cite><a href="https://drafts.csswg.org/css-style-attr/">CSS Styling Attribute Syntax</a></cite>, T. &Ccedil;elik, E. Etemad. W3C.</dd>
 
+   <dt id="refsCSSCASCADE">[CSSCASCADE]</dt>
+   <dd><cite><a href="https://drafts.csswg.org/css-cascade/">CSS Cascading and Inheritance Level 4</a></cite>, E. Etemad, T. Atkins. W3C.</dd>
+
    <dt id="refsCSSCOLOR">[CSSCOLOR]</dt>
    <dd><cite><a href="https://drafts.csswg.org/css-color/">CSS Color Module Level 3</a></cite>, T. &Ccedil;elik, C. Lilley, L. Baron. W3C.</dd>