[cssom-view] Allow 'perform a scroll' to be invoked without specifying 'behavior'

Author: Simon Pieters

cssom-view/Overview.html

@@ -413,14 +413,15 @@ <h2 id="common-infrastructure"><span class="secno">4 </span>Common Infrastructur
 <h3 id="scrolling"><span class="secno">4.1 </span>Scrolling</h3>
 
 <p>When a user agent is to <dfn id="perform-a-scroll">perform a scroll</dfn> of a scrolling box <var title="">box</var>, to a given position <var title="">position</var>, with a set of 
-steps <var title="">task</var>, an associated element <var title="">element</var> and a scroll behavior <var title="">behavior</var>, the following steps must be run:
+steps <var title="">task</var>, an associated element <var title="">element</var> and optionally a scroll behavior <var title="">behavior</var> (which is
+<code title="">auto</code> if omitted), the following steps must be run:
 
 <ol>
  <li><p><a href="#concept-smooth-scroll-aborted" title="concept-smooth-scroll-aborted">Abort</a> any ongoing <a href="#concept-smooth-scroll" title="concept-smooth-scroll">smooth scroll</a> for <var title="">box</var>.
  <li><p>If the user agent honors the '<code><a href="#scroll-behavior">scroll-behavior</a></code>' property and one of the following are true:
   <ul>
-   <li><p><var title="">behavior</var> is <code title="">auto</code> and <var title="">element</var> is not null and its computed value of the '<code><a href="#scroll-behavior">scroll-behavior</a></code>'
-   property is '<code title="scroll-behavior-smooth"><a href="#scroll-behavior-smooth">smooth</a></code>'
+   <li><p><var title="">behavior</var> is <code title="">auto</code> and <var title="">element</var> is not null and its computed value of the
+   '<code><a href="#scroll-behavior">scroll-behavior</a></code>' property is '<code title="scroll-behavior-smooth"><a href="#scroll-behavior-smooth">smooth</a></code>'
    <li><p><var title="">behavior</var> is <code title="">smooth</code>
   </ul>
   <p>...then follow these substeps:
@@ -544,7 +545,8 @@ <h2 id="extensions-to-the-window-interface"><span class="secno">5 </span>Extensi
 
 <p>The <dfn id="dom-window-pageyoffset" title="dom-Window-pageYOffset"><code>pageYOffset</code></dfn> attribute must return the value returned by the <code>scrollY</code> attribute.</p>
 
-<p>When the <dfn id="dom-window-scroll" title="dom-Window-scroll"><code>scroll(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked these steps must be run:</p>
+<p>When the <dfn id="dom-window-scroll" title="dom-Window-scroll"><code>scroll(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked these
+steps must be run:</p>
 <ol>
  <li><p>If there is no <a href="#viewport">viewport</a>, abort these steps.
   <dl class="switch">
@@ -573,14 +575,15 @@ <h2 id="extensions-to-the-window-interface"><span class="secno">5 </span>Extensi
    <code class="external"><a href="http://dom.spec.whatwg.org/#document">Document</a></code> object.
   </ol>
  <li><p><a href="#perform-a-scroll">Perform a scroll</a> of the <a href="#viewport">viewport</a> to <var title="">position</var>, with the set of steps <var title="">task</var>, and the
- <code class="external"><a href="http://dom.spec.whatwg.org/#document">Document</a></code>'s root element as the associated element, if there is one, or null otherwise, and the scroll behavior being the value of the <code title="">behavior</code> dictionary member of <var title="">options</var>.
+ <code class="external"><a href="http://dom.spec.whatwg.org/#document">Document</a></code>'s root element as the associated element, if there is one, or null otherwise, and the scroll behavior being the
+ value of the <code title="">behavior</code> dictionary member of <var title="">options</var>.
 </ol>
 
-<p>When the <dfn id="dom-window-scrollto" title="dom-Window-scrollTo"><code>scrollTo(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked, the user agent must act as if
-the <code title="dom-Window-scroll"><a href="#dom-window-scroll">scroll()</a></code> method was invoked with the same arguments.</p>
+<p>When the <dfn id="dom-window-scrollto" title="dom-Window-scrollTo"><code>scrollTo(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked, the
+user agent must act as if the <code title="dom-Window-scroll"><a href="#dom-window-scroll">scroll()</a></code> method was invoked with the same arguments.</p>
 
-<p>When the <dfn id="dom-window-scrollby" title="dom-Window-scrollBy"><code>scrollBy(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked, the user agent must act as if
-the <code title="dom-Window-scroll"><a href="#dom-window-scroll">scroll()</a></code> method was invoked with
+<p>When the <dfn id="dom-window-scrollby" title="dom-Window-scrollBy"><code>scrollBy(<var title="">x</var>, <var title="">y</var>, <var title="">options</var>)</code></dfn> method is invoked, the
+user agent must act as if the <code title="dom-Window-scroll"><a href="#dom-window-scroll">scroll()</a></code> method was invoked with
 <var title="">x</var> plus <code title="dom-Window-scrollX"><a href="#dom-window-scrollx">scrollX</a></code>
 as first argument and <var title="">y</var> plus
 <code title="dom-Window-scrollY"><a href="#dom-window-scrolly">scrollY</a></code> as second argument.</p>

cssom-view/Overview.src.html

@@ -381,14 +381,15 @@ <h2>Common Infrastructure</h2>
 <h3>Scrolling</h3>
 
 <p>When a user agent is to <dfn>perform a scroll</dfn> of a scrolling box <var title>box</var>, to a given position <var title>position</var>, with a set of 
-steps <var title>task</var>, an associated element <var title>element</var> and a scroll behavior <var title>behavior</var>, the following steps must be run:
+steps <var title>task</var>, an associated element <var title>element</var> and optionally a scroll behavior <var title>behavior</var> (which is
+<code title>auto</code> if omitted), the following steps must be run:
 
 <ol>
  <li><p><span title=concept-smooth-scroll-aborted>Abort</span> any ongoing <span title=concept-smooth-scroll>smooth scroll</span> for <var title>box</var>.
  <li><p>If the user agent honors the '<code>scroll-behavior</code>' property and one of the following are true:
   <ul>
-   <li><p><var title>behavior</var> is <code title>auto</code> and <var title>element</var> is not null and its computed value of the '<code>scroll-behavior</code>'
-   property is '<code title=scroll-behavior-smooth>smooth</code>'
+   <li><p><var title>behavior</var> is <code title>auto</code> and <var title>element</var> is not null and its computed value of the
+   '<code>scroll-behavior</code>' property is '<code title=scroll-behavior-smooth>smooth</code>'
    <li><p><var title>behavior</var> is <code title>smooth</code>
   </ul>
   <p>...then follow these substeps:
@@ -512,7 +513,8 @@ <h2>Extensions to the <code title>Window</code> Interface</h2>
 
 <p>The <dfn title=dom-Window-pageYOffset><code>pageYOffset</code></dfn> attribute must return the value returned by the <code>scrollY</code> attribute.</p>
 
-<p>When the <dfn title=dom-Window-scroll><code>scroll(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked these steps must be run:</p>
+<p>When the <dfn title=dom-Window-scroll><code>scroll(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked these
+steps must be run:</p>
 <ol>
  <li><p>If there is no <span>viewport</span>, abort these steps.
   <dl class=switch>
@@ -541,14 +543,15 @@ <h2>Extensions to the <code title>Window</code> Interface</h2>
    <code data-anolis-spec=dom>Document</code> object.
   </ol>
  <li><p><span>Perform a scroll</span> of the <span>viewport</span> to <var title>position</var>, with the set of steps <var title>task</var>, and the
- <code data-anolis-spec=dom>Document</code>'s root element as the associated element, if there is one, or null otherwise, and the scroll behavior being the value of the <code title>behavior</code> dictionary member of <var title>options</var>.
+ <code data-anolis-spec=dom>Document</code>'s root element as the associated element, if there is one, or null otherwise, and the scroll behavior being the
+ value of the <code title>behavior</code> dictionary member of <var title>options</var>.
 </ol>
 
-<p>When the <dfn title=dom-Window-scrollTo><code>scrollTo(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked, the user agent must act as if
-the <code title=dom-Window-scroll>scroll()</code> method was invoked with the same arguments.</p>
+<p>When the <dfn title=dom-Window-scrollTo><code>scrollTo(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked, the
+user agent must act as if the <code title=dom-Window-scroll>scroll()</code> method was invoked with the same arguments.</p>
 
-<p>When the <dfn title=dom-Window-scrollBy><code>scrollBy(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked, the user agent must act as if
-the <code title=dom-Window-scroll>scroll()</code> method was invoked with
+<p>When the <dfn title=dom-Window-scrollBy><code>scrollBy(<var title>x</var>, <var title>y</var>, <var title>options</var>)</code></dfn> method is invoked, the
+user agent must act as if the <code title=dom-Window-scroll>scroll()</code> method was invoked with
 <var title>x</var> plus <code title='dom-Window-scrollX'>scrollX</code>
 as first argument and <var title>y</var> plus
 <code title='dom-Window-scrollY'>scrollY</code> as second argument.</p>