[css-transitions] Use bikeshed markdown heading syntax.

The changes to the generated file are whitespace only (presumably all
whitespace removal, although I didn't check).

Author: dbaron

css-transitions/Overview.bs

@@ -101,14 +101,17 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
 </pre>
 </dl>
 
-<h2 id="introduction">Introduction</h2>
+Introduction {#introduction}
+============================
 
       <p><em>This section is not normative.</em>
       <p>
         This document introduces new CSS features to enable <em>implicit transitions</em>, which describe how CSS properties can be made to change smoothly from one value to another over a given duration.
       </p>
 
-<h2 id="transitions"><span id="transitions-">Transitions</span></h2>
+<span id="transitions-">Transitions</span> {#transitions}
+=========================================================
+
       <p>
         Normally when the value of a CSS property changes, the rendered result is instantly updated, with the affected elements immediately changing from the old property value to the new property value. This section describes a way to specify transitions using new CSS properties. These properties are used to animate smoothly from the old state to the new state over time.
       </p>
@@ -204,10 +207,9 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         ([[WCAG20]]).
       </p>
 
-      <!-- ======================================================================================================= -->
-      <h3 id="transition-property-property"><span id="the-transition-property-property-">
-        The 'transition-property' Property
-      </span></h3>
+<span id="the-transition-property-property-">The 'transition-property' Property</span> {#transition-property-property}
+----------------------------------------------------------------------------------------------------------------------
+
       <p>
         The 'transition-property' property specifies the name of the CSS property to which the transition is applied.
       </p>
@@ -282,10 +284,9 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         covers all properties.
       </p>
 
-      <!-- ======================================================================================================= -->
-      <h3 id="transition-duration-property"><span id="the-transition-duration-property-">
-        The 'transition-duration' Property
-      </span></h3>
+<span id="the-transition-duration-property-">The 'transition-duration' Property</span> {#transition-duration-property}
+----------------------------------------------------------------------------------------------------------------------
+
       <p>
         The 'transition-duration' property defines the length of time that a transition takes.
       </p>
@@ -305,12 +306,9 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         This property specifies how long the transition from the old value to the new value should take. By default the value is ''0s'', meaning that the transition is immediate (i.e. there will be no animation). A negative value for 'transition-duration' renders the declaration invalid.
       </p>
 
-      <!-- =======================================================================================================
-        -->
+<span id="transition-timing-function_tag">The 'transition-timing-function' Property</span> {#transition-timing-function-property}
+---------------------------------------------------------------------------------------------------------------------------------
 
-      <h3 id="transition-timing-function-property"><span id="transition-timing-function_tag">
-        The 'transition-timing-function' Property
-      </span></h3>
       <p>
         The 'transition-timing-function' property
         describes how the intermediate values used during a transition will be
@@ -446,10 +444,11 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
           in the range [0, 1] or the definition is invalid. The y values can
           exceed this range.
         </dd>
-      </dl><!-- ======================================================================================================= -->
-      <h3 id="transition-delay-property"><span id="the-transition-delay-property-">
-        The 'transition-delay' Property
-      </span></h3>
+      </dl>
+
+<span id="the-transition-delay-property-">The 'transition-delay' Property</span> {#transition-delay-property}
+-------------------------------------------------------------------------------------------------------------
+
       <p>
         The 'transition-delay' property defines when the transition will start. It allows a transition to begin execution some some period of time from when it is applied. A 'transition-delay' value of ''0s'' means the transition will execute as soon as the property is changed. Otherwise, the value specifies an offset from the moment the property is changed, and the transition will delay execution by that offset.
       </p>
@@ -467,10 +466,11 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         Media: interactive
         Computed value: Same as specified value.
         Canonical order: <abbr title="follows order of property value definition">per grammar</abbr>
-      </pre><!-- ======================================================================================================= -->
-      <h3 id="transition-shorthand-property"><span id="the-transition-shorthand-property-">
-        The 'transition' Shorthand Property
-      </span></h3>
+      </pre>
+
+<span id="the-transition-shorthand-property-">The 'transition' Shorthand Property</span> {#transition-shorthand-property}
+-------------------------------------------------------------------------------------------------------------------------
+
       <p>
         The 'transition' shorthand property combines the four properties described above into a single property.
       </p>
@@ -506,9 +506,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         then the declaration is invalid.
       </p>
 
-      <h2 id="starting">
-        Starting of transitions
-      </h2>
+Starting of transitions {#starting}
+===================================
 
       <p>
         Implementations must maintain a set of
@@ -999,9 +998,9 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         style for declarative animations.
       </p>
 
-      <h3 id="reversing">
-        Faster reversing of interrupted transitions
-      </h3>
+Faster reversing of interrupted transitions {#reversing}
+--------------------------------------------------------
+
       <div class="note">
 
       <p>
@@ -1051,9 +1050,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
 
       </div>
 
-      <h2 id="application">
-        Application of transitions
-      </h2>
+Application of transitions {#application}
+=========================================
 
       <p>
         When a property on an element is undergoing a transition
@@ -1113,7 +1111,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         as the input to the timing function.
       </p>
 
-      <h2 id="complete">Completion of transitions</h2>
+Completion of transitions {#complete}
+=====================================
 
       <p>
         <a>Running transitions</a>
@@ -1139,9 +1138,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         layout data.)</span>
       </p>
 
-      <h2 id="transition-events"><span id="transition-events-">
-        Transition Events
-      </span></h2>
+<span id="transition-events-">Transition Events</span> {#transition-events}
+===========================================================================
       <p>
         The completion of a CSS Transition generates a corresponding <a href="https://www.w3.org/TR/DOM-Level-2-Events/events.html">DOM Event</a>.
         An event is <a>dispatched</a> to the element
@@ -1246,9 +1244,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         </dd>
       </dl>
 
-      <h2 id="animatable-types"><span id="animation-of-property-types-">
-        Animation of property types
-      </span></h2>
+<span id="animation-of-property-types-">Animation of property types</span> {#animatable-types}
+==============================================================================================
 
       <p>
         Some property types can be interpolated,
@@ -1257,7 +1254,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         step from one value to the other.
       </p>
 
-      <h3 id="interpolated-types">Animation of interpolated property types</h3>
+Animation of interpolated property types {#interpolated-types}
+--------------------------------------------------------------
 
       <p>
         When interpolating between two values,
@@ -1404,7 +1402,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
       of shorthand properties and the ''all'' value is applied to any
       properties (in the shorthand) that can be animated.</p>
 
-      <h3 id="step-types">Animation in steps of other property types</h3>
+Animation in steps of other property types {#step-types}
+--------------------------------------------------------
 
       <p>
         When interpolating between two values that cannot be interpolated,
@@ -1428,9 +1427,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         and/or restricting it to step timing functions.
       </p>
 
-      <h2 id="animatable-properties"><span id="animatable-properties-">
-        Animatable properties
-      </span></h2>
+<span id="animatable-properties-">Animatable properties</span> {#animatable-properties}
+=======================================================================================
 
       <!--
       As resolved in
@@ -1479,9 +1477,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
         and the "no" value renamed to "discrete" or "in steps".
       </p>
 
-      <h3 id="animatable-css"><span id="properties-from-css-">
-        Properties from CSS
-      </span></h3>
+<span id="properties-from-css-">Properties from CSS</span> {#animatable-css}
+----------------------------------------------------------------------------
 
       <p>
       The following definitions define the animation behavior for
@@ -1627,9 +1624,8 @@ url: https://html.spec.whatwg.org/multipage/infrastructure.html#concept-event-di
        </tr>
      </table>
 
-     <h3 id="animatable-svg"><span id="properties-from-svg-">
-       Properties from SVG
-     </span></h3>
+<span id="properties-from-svg-">Properties from SVG</span> {#animatable-svg}
+----------------------------------------------------------------------------
 
      <p>
        All properties defined as animatable in the SVG specification, provided
@@ -1770,7 +1766,8 @@ The cascade also allows users to disable transitions entirely
 by overriding the transition properties.
 
 
-<h2 id="changes">Changes since Working Draft of 19 November 2013</h2>
+Changes since Working Draft of 19 November 2013 {#changes}
+==========================================================
 
 <p>The following are the substantive changes made since the
 <a href="https://www.w3.org/TR/2013/WD-css3-transitions-20131119/">Working Draft
@@ -1797,7 +1794,8 @@ dated 19 November 2013</a>:</p>
   <li>For more details on these changes, see the version control change logs, which are split in three parts because of file renaming: <a href="https://hg.csswg.org/drafts/log/tip/css-transitions/Overview.bs">change log since 2015 January 26</a>, <a href="https://hg.csswg.org/drafts/log/tip/css-transitions/Overview.src.html">change log from 2013 March 28 to 2015 January 26</a>, <a href="https://hg.csswg.org/drafts/log/tip/css3-transitions/Overview.src.html">change log before 2013 March 28</a>.
 </ol>
 
-<h2 id="acknowledgments">Acknowledgments</h2>
+Acknowledgments {#acknowledgments}
+==================================
 
 <p>Thanks especially to the feedback from
 Tab Atkins,