[css-cascade-3] Clear out Changes section.

Author: fantasai

css-cascade-3/Overview.bs

@@ -997,108 +997,19 @@ Erasing All Declarations: the ''unset'' keyword</h4>
 <h2 id="changes">
 Changes</h2>
 
-<h3 id="changes-2018">
-Changes Since the 28 August 2018 Candidate Recommendation</h3>
-
-	The following changes were made to this specification since the
-	<a href="https://www.w3.org/TR/2018/CR-css-cascade-3-20180828/">28 August 2018 Candidate Recommendation</a>:
-
-	<ul class=non-normative>
-		<li>
-			Clarify that ''@import'' ordering requirements are only in consideration of valid rules.
-		<li>
-			Clarify that [=computed values=] are not serialization strings, but abstract data.
-	</ul>
+	See also <a href="https://www.w3.org/TR/2021/REC-css-cascade-3-20210211/#changes">Changes prior to reaching Recommendation</a>.
 
-	<h3 id="changes-2016">
-		Changes Since the 19 May 2016 Candidate Recommendation</h3>
+<h3 id="changes-2018">
+Changes Since the 11 February 2021 Recommendation</h3>
 
-	The following non-trivial changes were made to this specification since the
-	<a href="https://www.w3.org/TR/2016/CR-css-cascade-3-20160519/">19 May 2016 Candidate Recommendation</a>:
+	Non-trivial changes since the <a href="https://www.w3.org/TR/2021/REC-css-cascade-3-20210211/#changes">11 February 2021 Recommendation</a> include:
 
 	<ul class=non-normative>
-		<li id="change-2016-custom-all">
-			Clarified that <a>custom properties</a> are not reset by the 'all' shorthand.
-			(<a href="https://github.com/w3c/csswg-drafts/issues/2518">2518</a>)
-			<blockquote>
-				<p>The 'all' property is a <a>shorthand</a> that resets <em>all</em> CSS properties
-				except 'direction' and 'unicode-bidi'.
-				&hellip;
-				<ins>It does not reset <a>custom properties</a> [[css-variables-1]].</ins>
-			</blockquote>
-
-		<li id="change-2016-import">
-			Called out two exceptions in which importing a style sheet
-			is different from merely inserting its contents.
-			<blockquote>
-				<p>If an ''@import'' rule refers to a valid stylesheet,
-				user agents must treat the contents of the stylesheet as if they were written in place of the ''@import'' rule<ins>,
-				with two exceptions:</ins></p>
-
-				<ins><ul>
-					<li>If a feature
-						(such as the ''@namespace'' rule)
-						<em>explicitly</em> defines that it only applies to a particular stylesheet,
-						and not any imported ones,
-						then it doesn't apply to the imported stylesheet.
-
-					<li>If a feature relies on the relative ordering of two or more constructs in a stylesheet
-						(such as the requirement that ''@charset'' must not have any other content preceding it),
-						it only applies between constructs in the same stylesheet.
-				</ul></ins>
-			</blockquote>
-
-		<li id="change-2016-scope">
-			Removed any mention of scoped stylesheets,
-			as the feature was removed from HTML.
-			(<a href="https://github.com/w3c/csswg-drafts/issues/637">Issue 637</a>)
-
-		<li id="change-2016-override">
-			Removed any mention of the obsolete “override” origin,
-			originally defined by <a href="https://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/">DOM Level 2 Style</a>
-			and later abandoned.
-	</ul>
-
-	A <a href="https://drafts.csswg.org/css-cascade-3/issues-cr-2016">Disposition of Comments</a> is available.
-
-<h3 id="changes-2013">
-Changes Since the 3 October 2013 Candidate Recommendation</h3>
-
-	The following changes were made to this specification since the
-	<a href="https://www.w3.org/TR/2013/CR-css-cascade-3-20131003/">3 October 2013 Candidate Recommendation</a>:
-
-	<ul class="non-normative">
-		<li>Defined <a>environment encoding</a> of imported style sheets.
-			<blockquote>
-				<ins><p>The <a>environment encoding</a> of an imported style sheet is the encoding of the style sheet that imported it. [[css-syntax-3]]</p></ins>
-			</blockquote>
-		<li>Referenced [[!css-syntax-3]] for syntax of ''!important'' rules.
-			<blockquote>
-				<p>A declaration is <a>important</a> if it has a ''!important'' annotation,
-				<ins>as defined by [[css-syntax-3]]</ins>.
-			</blockquote>
-		<li>Explained <a>reset-only sub-properties</a>
-		    and clarified that they also get affected by a CSS-wide keyword value in the shorthand declaration.
-			<blockquote>
-				<p><ins>In other cases, a property might be a <a>reset-only sub-property</a> of the shorthand:
-				Like other <a>sub-properties</a>, it is reset to its initial value by the shorthand when unspecified,
-				but the shorthand might not include syntax to set the <a>sub-property</a>
-				to any of its other values.
-				For example, the 'border' shorthand resets 'border-image'
-				to its initial value of ''border-image/none'',
-				but has no syntax to set it to anything else. [[css-backgrounds-3]]</ins></p>
-
-				<p>If a <a>shorthand</a> is specified as one of the <a href="https://www.w3.org/TR/css3-values/#common-keywords">CSS-wide keywords</a> [[!css-values-3]],
-				it sets all of its <a>sub-properties</a> to that keyword,
-				<ins>including any that are <a>reset-only sub-properties</a></ins>.
-				(Note that these keywords cannot be combined with other values in a single declaration, not even in a shorthand.)</p>
-			</blockquote>
-
+		<li id="change-2020-properties">
+			Added a paragraph to the introduction to define the term [=property=].
+			(<a href="https://github.com/w3c/csswg-drafts/issues/5633">Issue 5633</a>)
 	</ul>
 
-	<p>A <a href="https://drafts.csswg.org/css-cascade-3/issues-cr-2013">Disposition of Comments</a> is available.
-
-
 <h3 id="changes-2">
 Additions Since Level 2</h3>