Move 'scroll-behavior' from [cssom-view] to [css-overflow-3]

Closes w3c#6482

Author: frivoal

css-overflow-3/Overview.bs

@@ -684,6 +684,43 @@ as the Flow-Relative box model properties defined in [[css-logical-1#box]].
   'overflow-x' and 'overflow-y' properties.
   The mapping depends on the element's 'writing-mode'.
 
+<h3 id=smooth-scrolling caniuse=css-scroll-behavior>
+Smooth Scrolling: The 'scroll-behavior' Property</h3>
+
+	<pre class=propdef>
+	Name: scroll-behavior
+	Value: auto | smooth
+	Initial: auto
+	Applies to: <a>scrolling boxes</a>
+	Inherited: no
+	Computed value:    specified value
+	Animatable: no
+	Canonical Order: per grammar
+	</pre>
+
+	The 'scroll-behavior' property specifies the scrolling behavior for a <a>scrolling box</a>,
+	when scrolling happens due to navigation,
+	scrolling APIs [[!CSSOM-VIEW]],
+	or scroll snapping operations not initiated by the user [[!CSS-SCROLL-SNAP-1]].
+	Any other scrolls, e.g. those that are performed by the user, are not affected by this property.
+	When this property is specified on the root element, it applies to the <a>viewport</a> instead.
+
+	Note: The 'scroll-behavior' property of the HTML <code>body</code> element is <em>not</em> propagated to the viewport.
+
+	<dl dfn-type=value dfn-for=scroll-behavior>
+		<dt><dfn>auto</dfn>
+		<dd>
+			The <a>scrolling box</a> is scrolled in an <a spec=cssom-view lt="instant scroll">instant</a> fashion.
+
+		<dt><dfn>smooth</dfn>
+		<dd>
+			The <a>scrolling box</a> is scrolled in a <a spec=cssom-view lt="smoot scroll">smooth</a> fashion
+			using a user-agent-defined timing function over a user-agent-defined period of time.
+			User agents should follow platform conventions, if any. <!--fingerprint-->
+	</dl>
+
+	User agents may ignore this property. <!--fingerprint-->
+
 <h2 id="auto-ellipsis">
 Automatic Ellipses</h2>
 
@@ -1432,6 +1469,12 @@ This specification introduces no new privacy or security concerns.
 
 This appendix is <em>informative</em>.
 
+<h3 id="changes-since-2020-06-03">
+Changes from the <a href="https://www.w3.org/TR/2020/WD-css-overflow-3-20200603/">2020-06-03 Working Draft</a></h3>
+
+* Moved the 'scroll-behavior' property from [[CSSOM-VIEW]] to this specification.
+<!-- This list is not complete -->
+
 <h3 id="changes-since-2018-07-31">
 Changes from the <a href="https://www.w3.org/TR/2018/WD-css-overflow-3-20180731/">2018-07-31 Working Draft</a>
 </h3>

cssom-view-1/Overview.bs

@@ -1644,42 +1644,6 @@ When asked to <dfn>run the scroll steps</dfn> for a {{Document}} <var>doc</var>,
    <td>Fired at the {{Document}} or element when the <a>viewport</a> or element is scrolled, respectively.
 </table>
 
-<h2 id=css-properties>CSS properties</h2>
-
-Issue: The features in this section should be moved to some other specification.
-
-<h3 id=smooth-scrolling caniuse=css-scroll-behavior>Smooth Scrolling: The 'scroll-behavior' Property</h3>
-
-<pre class=propdef>
-Name: scroll-behavior
-Value: auto | smooth
-Initial: auto
-Applies to: <a>scrolling boxes</a>
-Inherited: no
-Computed value:    specified value
-Animatable: no
-Canonical Order: per grammar
-</pre>
-
-The 'scroll-behavior' property specifies the scrolling behavior for a <a>scrolling box</a>,
-when scrolling happens due to navigation, CSSOM scrolling APIs,
-or scroll snapping operations not initiated by the user [[!CSS-SCROLL-SNAP-1]].
-Any other scrolls, e.g. those that are performed by the user, are not affected by this property.
-When this property is specified on the root element, it applies to the <a>viewport</a> instead.
-
-<p class=note>The 'scroll-behavior' property of the HTML <code>body</code> element is <em>not</em> propagated to the viewport.
-
-<dl dfn-type=value dfn-for=scroll-behavior>
- <dt><dfn>auto</dfn>
- <dd>The <a>scrolling box</a> is scrolled in an instant fashion.
-
- <dt><dfn>smooth</dfn>
- <dd>The <a>scrolling box</a> is scrolled in a smooth fashion using a user-agent-defined timing function over a user-agent-defined period of time. User
- agents should follow platform conventions, if any. <!--fingerprint-->
-</dl>
-
-User agents may ignore this property. <!--fingerprint-->
-
 
 Security and Privacy Considerations {#priv-sec}
 ===============================================
@@ -1700,6 +1664,7 @@ generally not listed.
 <h3 id='changes-from-2020-10-19' class=no-num>Changes From 19 October 2020</h3>
 * Added the "Security and Privacy Considerations" section
 * Fixed a logical error in the Terminology section.
+* Moved the 'scroll-behavior' property to [[CSS-OVERFLOW-3]]
 
 <h3 id='changes-from-2020-01-31' class=no-num>Changes From 31 January 2020</h3>
 * Added Simon Fraser as editor