define the scroll event as it is dispatched by non-UI actions

Author: annevk

cssom-view/Overview.html

@@ -252,10 +252,11 @@ <h3 id=terminology><span class=secno>2.2. </span>Terminology</h3>
    media queries</dfn> are defined by the CSSOM. [<cite><a
    href="#ref-cssom">CSSOM</a></cite>]
 
-  <p> <dfn id=html-element>HTML element</dfn>, <dfn
-   id=htmlelement><code>HTMLElement</code></dfn>, <dfn id=queue-a-task>queue
-   a task</dfn>, <dfn id=quirks-mode>quirks mode</dfn>, <dfn
-   id=task>task</dfn>, and <dfn id=window><code>Window</code></dfn> are
+  <p> <dfn id=fire-a-simple-event title="Fire a simple event">Firing a simple
+   event named <var title="">e</var></dfn>, <dfn id=html-element>HTML
+   element</dfn>, <dfn id=htmlelement><code>HTMLElement</code></dfn>, <dfn
+   id=queue-a-task>queue a task</dfn>, <dfn id=quirks-mode>quirks mode</dfn>,
+   <dfn id=task>task</dfn>, and <dfn id=window><code>Window</code></dfn> are
    defined by HTML5. [<cite><a href="#ref-html5">HTML5</a></cite>]
 
   <p><dfn id=the-html-body-element>The HTML <code>body</code> element</dfn>
@@ -419,6 +420,15 @@ <h2 id=extensions-to-the-window-interface><span class=secno>3.
      href="#viewport">viewport</a> and align the y-coordinate <var
      title="">y</var> of the <a href="#document-content">document content</a>
      with the top of the <a href="#viewport">viewport</a>.
+
+   <li>
+    <p>If the aligning caused content to move <a href="#queue-a-task">queue a
+     task</a> to <a href="#fire-a-simple-event">fire a simple event</a> named
+     <code title=event-scroll>scroll</code> that bubbles at the <a
+     href="#document"><code>Document</code></a> object, unless a <a
+     href="#task">task</a> to fire that event at the <a
+     href="#document"><code>Document</code></a> object was already <a
+     href="#queue-a-task" title="queue a task">queued</a>.
   </ol>
 
   <p>When the <dfn id=dom-window-scrollto
@@ -960,6 +970,13 @@ <h3 id=scroll-attributes><span class=secno>5.2. </span>The <code
     <p>Align <a href="#content">content</a> y-coordinate <var
      title="">y</var> with the top of the <a href="#content-edge">content
      edge</a> of the element.
+
+   <li>
+    <p>If the aligning caused content to move <a href="#queue-a-task">queue a
+     task</a> to <a href="#fire-a-simple-event">fire a simple event</a> named
+     <code title=event-scroll>scroll</code> at the element, unless a <a
+     href="#task">task</a> to fire that event at the element was already <a
+     href="#queue-a-task" title="queue a task">queued</a>.
   </ol>
 
   <p>The <dfn id=dom-element-scrollleft><code>scrollLeft</code></dfn>
@@ -1046,6 +1063,13 @@ <h3 id=scroll-attributes><span class=secno>5.2. </span>The <code
     <p>Align <a href="#content">content</a> x-coordinate <var
      title="">x</var> with the left of the <a href="#content-edge">content
      edge</a> of <var>A</var>.
+
+   <li>
+    <p>If the aligning caused content to move <a href="#queue-a-task">queue a
+     task</a> to <a href="#fire-a-simple-event">fire a simple event</a> named
+     <code title=event-scroll>scroll</code> at the element, unless a <a
+     href="#task">task</a> to fire that event at the element was already <a
+     href="#queue-a-task" title="queue a task">queued</a>.
   </ol>
 
   <p>The <dfn id=dom-element-scrollwidth><code>scrollWidth</code></dfn>

cssom-view/Overview.src.html

@@ -125,6 +125,7 @@ <h3 id="terminology">Terminology</h3>
   are defined by the CSSOM. [<cite><span>CSSOM</span></cite>]</p>
 
   <p>
+   <dfn id="fire-a-simple-event" title="Fire a simple event">Firing a simple event named <var title="">e</var></dfn>,
    <dfn>HTML element</dfn>,
    <dfn><code>HTMLElement</code></dfn>,
    <dfn>queue a task</dfn>,
@@ -285,6 +286,13 @@ <h2 id="extensions-to-the-window-interface">Extensions to the <code title="">Win
    <span>document content</span> with the left of the <span>viewport</span>
    and align the y-coordinate <var title="">y</var> of the <span>document
    content</span> with the top of the <span>viewport</span>.</p></li>
+
+   <li><p>If the aligning caused content to move <span>queue a task</span>
+   to <span>fire a simple event</span> named
+   <code title="event-scroll">scroll</code> that bubbles at the
+   <code>Document</code> object, unless a
+   <span>task</span> to fire that event at the <code>Document</code> object
+   was already <span title="queue a task">queued</span>.</p></li>
   </ol>
 
   <p>When the
@@ -761,6 +769,12 @@ <h3 id="scroll-attributes">The <code title="">scrollTop</code>,
 
    <li><p>Align <span>content</span> y-coordinate <var title="">y</var> with
    the top of the <span>content edge</span> of the element.</p></li>
+
+   <li><p>If the aligning caused content to move <span>queue a task</span>
+   to <span>fire a simple event</span> named
+   <code title="event-scroll">scroll</code> at the element, unless a
+   <span>task</span> to fire that event at the element was already
+   <span title="queue a task">queued</span>.</p></li>
   </ol>
 
   <p>The <dfn id="dom-element-scrollleft"><code>scrollLeft</code></dfn>
@@ -828,6 +842,12 @@ <h3 id="scroll-attributes">The <code title="">scrollTop</code>,
 
    <li><p>Align <span>content</span> x-coordinate <var title="">x</var> with
    the left of the <span>content edge</span> of <var>A</var>.</p></li>
+
+   <li><p>If the aligning caused content to move <span>queue a task</span>
+   to <span>fire a simple event</span> named
+   <code title="event-scroll">scroll</code> at the element, unless a
+   <span>task</span> to fire that event at the element was already
+   <span title="queue a task">queued</span>.</p></li>
   </ol>
 
   <p>The <dfn id="dom-element-scrollwidth"><code>scrollWidth</code></dfn>