[css-inline-3] Add propdef table for 'line-height'. Still referencing 2.1 for definition.

Author: fantasai

css-inline-3/Overview.bs

@@ -254,7 +254,7 @@ Alignment Point: 'alignment-baseline' longhand</h4>
 	These values are not allowed in the 'vertical-align' shorthand.
 
 <h4 id="baseline-shift-property">
-Alignment Shift: 'baseline-shift' longhand</h4>
+Alignment Shift: the 'baseline-shift' longhand</h4>
 
 	<pre class="propdef">
 	Name: baseline-shift
@@ -298,6 +298,32 @@ Alignment Shift: 'baseline-shift' longhand</h4>
 
 	Issue: We would prefer to remove this, and are looking for feedback from SVG user agents as to whether it's necessary.
 
+<h4 id="line-height-property">
+Line Spacing: the 'line-height' property</h4>
+
+	<pre class="propdef">
+	Name: line-height
+	Value: normal | <<number>> || <<length-percentage>>
+	Initial: normal
+	Applies to: inline boxes
+	Inherited: yes
+	Percentages: computed relative to ''1em''
+	Computed value: the specified keyword, a number, or a computed <<length>> value
+	</pre>
+
+	<dl dfn-type=value dfn-for=line-height>
+		<dt><dfn>normal</dfn>
+		<dt><dfn><<number>></dfn>
+		<dt><dfn><<length-percentage>></dfn>
+		<dd>See <a href="https://www.w3.org/TR/CSS2/visudet.html#line-height">CSS2&sect;10.8.1</a>.
+	</dl>
+
+	ISSUE: Fill out this definition so that it fully replaces CSS2.
+
+	ISSUE: The fact that percentages compute to lengths is annoying.
+	See also href="https://github.com/w3c/csswg-drafts/issues/3118">Issue 3118</a>
+	and <a href="https://github.com/w3c/csswg-drafts/issues/2165">Issue 2165</a>.
+
 <h2 id="inline-box-dimensions">
 Drawing Inline Boxes</h2>
 
@@ -498,7 +524,7 @@ Creating Initial Letters: the 'initial-letters' property</h3>
 	Applies to: certain inline-level boxes and <css>::first-letter</css> and inside <css>::marker</css> boxes (<a href="#first-most-inline-level">see prose</a>)
 	Inherited: no
 	Percentages: N/A
-	Computed value: the keyword ''normal'' or a number paired with an integer
+	Computed value: the keyword ''initial-letters/normal'' or a number paired with an integer
 	Animation type: by computed value type
 	</pre>
 
@@ -940,7 +966,7 @@ Sizing Initial Letters</h3>
 <h4 id="initial-letter-shaping">
 Shaping and Glyph Selection</h4>
 
-	When 'initial-letters' is not ''normal'',
+	When 'initial-letters' is not ''initial-letters/normal'',
 	shaping <em>should</em> still occur across the box's boundaries,
 	see [[css-text-3#boundary-shaping]].
 	For example, if the first letter of the Farsi word “پس”