[css-ui-4] text cursors must respect writing modes

Closes w3c#3196

Author: frivoal

css-ui-4/Overview.bs

@@ -718,6 +718,12 @@ Values have the following meanings:
 			Specifically, ''cursor/auto'' behaves as ''cursor/text'' over selectable text or editable elements,
 			and ''cursor/default'' otherwise.
 
+			Note: When over selectable text or editable elements,
+			as it does with ''cursor/text'',
+			the UA must use a vertical or horizontal text cursor,
+			as appropriate for the [=writing mode=] of the element,
+			and may take transforms and other visual effects into account as well.
+
 		<dt style="cursor:default"><dfn>default</dfn>
 		<dd>The platform-dependent default cursor.
 		Often rendered as an arrow.
@@ -772,11 +778,16 @@ Values have the following meanings:
 
 		<dt style="cursor:text"><dfn>text</dfn>
 		<dd>
-			Indicates text that may be selected. Often rendered as a vertical I-beam.
-			User agents may automatically display a horizontal I-beam/cursor
+			Indicates text that may be selected. Often rendered as an I-beam.
+			User Agents must automatically display
+			a vertical I-beam/cursor over elements with a horizontal [=writing mode=],
+			and a horizontal I-beam/cursor
 			(e.g. same as the ''vertical-text'' keyword)
-			for vertical text, or for that matter,
-			any angle of I-beam/cursor for text that is rendered at any particular angle.
+			over elements in a vertical [=writing mode=].
+			Additionally, User Agents may take transforms (see [[CSS-TRANSFORMS-1]])
+			or other visual effects such as text on a path (See [[SVG2#TextLayoutPath]]),
+			when chosing between the horizontal or vertical text cursor,
+			and may display any angle of I-beam/cursor for text that is rendered at any particular angle.
 
 		<dt style="cursor:vertical-text"><dfn>vertical-text</dfn>
 		<dd>Indicates vertical-text that may be selected.
@@ -2104,6 +2115,7 @@ This appendix is <em>informative</em>.
 	<li>Clarify interaction between text-overflow and annonymous block containers
 	<li>Require the ''cursor/pointer'' cursor for hyperlinks in all document formats
 	<li>Moved the 'box-sizing' and 'text-overflow' properties to [[CSS-SIZING-3]] and [[CSS-OVERFLOW-4]] respectively.
+	<li>Changed the requirement that the ''cursor/text'' cursor matches the writing mode from MAY to MUST
 </ul>
 
 <h3 id=changes-22-09-2015 class=no-num>Changes from the

css-ui-4/issues-fpwd-2015.html

@@ -145,6 +145,15 @@ <h1>CSS Basic User Interface Module Level 4 Disposition of Comments for 2015-09-
 Response: <a href='https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-388486742'>https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-388486742</a>
 Closed:   Accepted
 Resolved: <a href='https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-395243086'>https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-395243086</a></pre>
+<pre class='a' id='issue-15'>
+Issue 15. <a href='#issue-15'>#</a>
+Summary:  Make the text cursor better match writing modes
+From:     張俊芝 (Zhang-Junzhi)
+Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/3196'>https://github.com/w3c/csswg-drafts/issues/3196</a>
+Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427467122'>https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427467122</a>
+Response: <a href='https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427736600'>https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427736600</a>
+Closed:   Accepted
+Resolved: <a href='https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-430693269'>https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-430693269</a></pre>
 <script>
 (function () {
     var sheet = document.styleSheets[0];

css-ui-4/issues-fpwd-2015.txt

@@ -121,3 +121,12 @@ Comment:  https://github.com/w3c/csswg-drafts/issues/2664
 Response: https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-388486742
 Closed:   Accepted
 Resolved: https://github.com/w3c/csswg-drafts/issues/2664#issuecomment-395243086
+----
+Issue 15.
+Summary:  Make the text cursor better match writing modes
+From:     張俊芝 (Zhang-Junzhi)
+Comment:  https://github.com/w3c/csswg-drafts/issues/3196
+Comment:  https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427467122
+Response: https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-427736600
+Closed:   Accepted
+Resolved: https://github.com/w3c/csswg-drafts/issues/3196#issuecomment-430693269