[css-text-3] Move paragraphs. Tweak wording.

Author: fantasai

css-text-3/Overview.bs

@@ -172,6 +172,16 @@ Languages and Typesetting</h3>
     Authors should accurately language-tag their content for the best typographic behavior.
   </strong>
 
+    Many typographic effects vary by linguistic context.
+    Language and writing system conventions can affect
+    line breaking, hyphenation, justification, glyph selection,
+    and many other typographic effects.
+    <strong>In CSS, language-specific typographic tailorings
+    are only applied when the <a>content language</a> is known (declared).</strong>
+    Therefore,
+    higher quality typography requires authors to communicate to the UA
+    the correct linguistic context of the text in the document.
+
     The <dfn export>content language</dfn> of an element is the (human) language
     the element is declared to be in, according to the rules of the
     <a href="https://www.w3.org/TR/CSS2/conform.html#doclanguage">document language</a>.
@@ -195,16 +205,6 @@ Languages and Typesetting</h3>
     this information can be explicit or implied.
     See the normative [[#script-tagging]].
 
-    Many typographic effects vary by linguistic context.
-    Language and writing system conventions can affect
-    line breaking, hyphenation, justification, glyph selection,
-    and many other typographic effects.
-    <strong>In CSS, language-specific typographic tailorings
-    are only applied when the <a>content language</a> is known (declared).</strong>
-    Therefore,
-    higher quality typography requires authors to communicate to the UA
-    the correct linguistic context of the text in the document.
-
 <h3 id="characters">
 Characters and Letters</h3>
 
@@ -5562,7 +5562,7 @@ Space-Discarding Unicode Characters</h2>
   </details>
 
 <h2 id="script-tagging" class="no-num">Appendix G.
-Tagging Content by Writing System</h2>
+Identifying the Content Writing System</h2>
 
 	<p><em>This appendix is normative.</em></p>
 
@@ -5571,7 +5571,7 @@ Tagging Content by Writing System</h2>
 	most can also be transcribed into one or more foreign writing systems.
 	As a common example, most languages have at least one Latin transcription,
 	and can thus be written in the Latin writing system.
-	Such docouments typically adopt the typographic conventions of the Latin writing system:
+	Transcribed texts typically adopt the typographic conventions of the writing system:
 	for example Japanese “romaji” and Chinese Pinyin use Latin letters and word spaces,
 	and follow Latin line-breaking and justification practices accordingly.
 	As another example, historical ideographic Korean
@@ -5580,7 +5580,7 @@ Tagging Content by Writing System</h2>
 	and should therefore be typeset similar to Chinese
 	rather than modern Korean.
 
-	In [[HTML]] or any other <a>document language</a> using [[BCP47]] to identify the [=content language=],
+	In [[HTML]] or any other <a>document language</a> using [[BCP47]] to declare the [=content language=],
 	authors can indicate the use of an atypical writing system
 	with script subtags.
 	For example, to indicate use of the Latin writing system
@@ -5606,18 +5606,24 @@ Tagging Content by Writing System</h2>
 		</dl>
 	</div>
 
+	Note: More advice on language tagging can be found in
+	the <a href="https://www.w3.org/International/core/">Internationalization Working Group</a>’s
+	<a href="https://www.w3.org/International/articles/language-tags/">“Language tags in HTML and XML”</a>
+	and <a href="https://www.w3.org/International/questions/qa-choosing-language-tags">“Choosing a Language Tag”</a>.
+
+	When no writing system is explicitly indicated,
 	UAs should assume the most common writing system
-	of the specified <a>content language</a>
-	when choosing typographic behaviors
-	such as line-breaking or justification strategies,
-	but must not assume that writing system
-	if the author has explicitly indicated a different one.
+	of the declared <a>content language</a>
+	for language-sensitive typographic behaviors
+	such as line-breaking or justification.
+	However, UAs must not assume that writing system
+	if the author has explicitly declared a different one.
 	If the UA has no language-specific knowledge
 	of a particular language and writing system combination,
-	it must use the typographic conventions of the specified writing system
+	it must use the typographic conventions of the declared writing system
 	(assuming the conventions of a different language if necessary),
-	not the conventions of that language in a different writing system,
-	which would be inappropriate to the writing system used in this case.
+	not the conventions of the declared language in an assumed writing system,
+	which would be inappropriate to the declared writing system.
 
 	<wpt>
 		writing-system/writing-system-font-001.html
@@ -5627,7 +5633,7 @@ Tagging Content by Writing System</h2>
 		writing-system/writing-system-line-break-002.html
 	</wpt>
 
-	The full correspondence between languages and their most common writing system
+	The full correspondence between languages and their most common writing systems
 	is out of scope for this document.
 	However, User Agents must assume at least the following:
 
@@ -5637,8 +5643,6 @@ Tagging Content by Writing System</h2>
 	* If the [=content language=] is Japanese and the [=writing system=] is unspecified,
 		or for any [=content language=] if the [=writing system=] to specified to be one of the ''Jpan'', ''Hrkt'', ''Hira'' or ''Kana'' [[ISO15924]] codes,
 		then the [=writing system=] is <dfn noexport for=writing-system>Japanese</dfn>.
-
-
 		<wpt>
 			writing-system/writing-system-line-break-002.html
 			writing-system/writing-system-segment-break-001.html
@@ -5650,14 +5654,9 @@ Tagging Content by Writing System</h2>
 		if the [=content language=] itself is unknown,
 		or if it explicitly indicates an unknown writing system.
 
-		Note: Mere omission of the [=writing system=] information when the [=content language=] is specified
+		Note: Mere omission of the [=writing system=] information when the [=content language=] is declared
 		means the that the [=writing system=] is implied, not unknown.
 
-	More advice on language tagging can be found in
-	the <a href="https://www.w3.org/International/core/">Internationalization Working Group</a>’s
-	<a href="https://www.w3.org/International/articles/language-tags/">“Language tags in HTML and XML”</a>
-	and <a href="https://www.w3.org/International/questions/qa-choosing-language-tags">“Choosing a Language Tag”</a>.
-
 <h2 id="small-kana" class=no-num>Appendix H.
 Small Kana Mappings</h2>
 <style>