[css-ui-4] Tweaks to text-decoration-skip-* based on review of w3c#843

Author: frivoal

css-text-decor-4/Overview.bs

@@ -817,7 +817,11 @@ Text Decoration Line Continuity: the 'text-decoration-skip' shorthand and its su
 	</pre>
 
 	The 'text-decoration-skip' property and its sub-properties
-	('text-decoration-skip-self', 'text-decoration-skip-edge', 'text-decoration-skip-spaces', 'text-decoration-skip-ink')
+	('text-decoration-skip-self',
+	'text-decoration-skip-box',
+	'text-decoration-skip-inset',
+	'text-decoration-skip-spaces',
+	'text-decoration-skip-ink')
 	control interruptions in line decorations
 	for which the element or an ancestor is the [=decorating box=].
 	The <dfn value for=text-decoration-skip>none</dfn> value
@@ -881,7 +885,7 @@ Skipping Spaces: the 'text-decoration-skip-self' property</h4>
 -->
 	</dl>
 
-<h4 id="text-decoration-skip-edges-property">
+<h4 id="text-decoration-skip-box-property">
 Skipping Spaces: the 'text-decoration-skip-box' property</h4>
 
 	<pre class="propdef">
@@ -949,17 +953,19 @@ Inset Edges: the 'text-decoration-skip-inset' property</h4>
 
 		<dt><dfn>auto</dfn></dt>
 		<dd>
-			The UA should place the start and end of the line inwards slightly
-			(e.g. by half a line thickness)
+			The UA must place the start and end of the line inwards slightly
 			from the content edge of the <a>decorating box</a> so that,
 			e.g. two underlined elements side-by-side do not appear to have a single underline.
+			The size of the inset is up to the User Agent
+			(e.g. half a line thickness)
+			but must not be zero.
 			(This is important in Chinese, where underlining is a form of punctuation.)
 
 			<div class="figure">
-				<p><img title="text-decoration-skip: edges"
+				<p><img title="text-decoration-skip-inset: auto"
 				        alt="An underline below a series of Chinese characters has a gap between two adjacent underlining elements."
-				        src="images/decoration-skip-edges.png">
-				<p class="caption">''text-decoration-skip: edges'' for <code>&lt;u>石井&lt;/u>&lt;u>艾俐俐&lt;/u></code>
+				        src="images/decoration-skip-inset.png">
+				<p class="caption">''text-decoration-skip-inset: auto'' for <code>&lt;u>石井&lt;/u>&lt;u>艾俐俐&lt;/u></code>
 </p>
 			</div>
 	</dl>
@@ -970,7 +976,7 @@ Skipping Spaces: the 'text-decoration-skip-spaces' property</h4>
 	<pre class="propdef">
 	Name: text-decoration-skip-spaces
 	Value: none | all | [ start || end ]
-	Initial: leading trailing
+	Initial: start end
 	Applies to: all elements
 	Inherited: yes
 	Percentages: N/A
@@ -996,15 +1002,15 @@ Skipping Spaces: the 'text-decoration-skip-spaces' property</h4>
 			with the Unicode White_Space property [[UAX44]],
 			plus any adjacent 'letter-spacing' or 'word-spacing'.
 
-		<dt><dfn>leading</dfn></dt>
+		<dt><dfn>start</dfn></dt>
 		<dd>
 			Skip all spaces,
 			i.e. all <a>typographic character units</a> with the Unicode White_Space property [[UAX44]]
 			and all <a href="https://www.w3.org/TR/css3-text/#word-separator">word separators</a>
 			plus any adjacent 'letter-spacing' or 'word-spacing',
 			when located at the start of the line.
 
-		<dt><dfn>trailing</dfn></dt>
+		<dt><dfn>end</dfn></dt>
 		<dd>
 			Skip all spacing,
 			i.e. all <a>typographic character units</a> with the Unicode White_Space property [[UAX44]]
@@ -1016,8 +1022,6 @@ Skipping Spaces: the 'text-decoration-skip-spaces' property</h4>
 	ISSUE: Should ''text-decoration-skip-spaces'' really skip all spaces?
 	Or should it only skip word-separators that are also spaces?
 
-	ISSUE: Should we rename ''leading'' and ''trailing'' to <css>start</css> and <css>end</css> to make things simpler for i18n?
-
 <h4 id="text-decoration-skip-ink-property">
 Skipping Glyphs: the 'text-decoration-skip-ink' property</h4>