[css-values-3][css-values-4] Resync Levels Round 2

Author: fantasai

css-values-3/Overview.bs

@@ -369,6 +369,13 @@ Textual Data Types</h2>
 	consist of a sequence of characters conforming to the <<ident-token>> grammar. [[!CSS-SYNTAX-3]]
 	Identifiers cannot be quoted;
 	otherwise they would be interpreted as strings.
+	CSS properties accept two classes of <a>identifiers</a>:
+	[[#keywords|pre-defined keywords]]
+	and [[#custom-idents|author-defined identifiers]].
+
+	Note: The <<ident>> production is not meant for property value definitions--
+	<<custom-ident>> should be used instead.
+	It is provided as a convenience for defining other syntactic constructs.
 
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@@ -686,6 +693,15 @@ URL Modifiers</h4>
 <h2 id="numeric-types">
 Numeric Data Types</h2>
 
+	Numeric data types are used to represent
+	quantities, indexes, positions, and other such values.
+	Although many syntactic variations can exist
+	in expressing the quantity (numeric aspect) in a given numeric value,
+	the <a lt="specified value">specified</a> and <a>computed value</a>
+	do not distinguish these variations:
+	they represent the value’s abstract quantity,
+	not its syntactic representation.
+
 	The <dfn>numeric data types</dfn> include
 	<<integer>>,
 	<<number>>,
@@ -1315,7 +1331,7 @@ Absolute Lengths: the ''cm'', ''mm'', ''Q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	were not related by a fixed ratio:
 	the [=physical units=] were always tied to their physical measurements
 	while the [=pixel unit=] would vary to most closely match the reference pixel.
-	(This unfortunately change
+	(This unfortunate change
 	was made because too much existing content relies on the assumption of 96dpi,
 	and breaking that assumption broke the content.)
 

css-values-4/Overview.bs

@@ -841,7 +841,7 @@ Relative URLs</h4>
 <h5 id='local-urls'>
 Fragment URLs</h5>
 
-	To work around some common eccentricites in browser URL handling,
+	To work around some common eccentricities in browser URL handling,
 	CSS has special behavior for fragment-only urls.
 
 	If a ''url()''’s value starts with a U+0023 NUMBER SIGN (<code>#</code>) character,
@@ -1052,6 +1052,12 @@ Real Numbers: the <<number>> type</h3>
 	Number values are denoted by <dfn id="number-value">&lt;number></dfn>,
 	and represent real numbers, possibly with a fractional component.
 
+	<wpt>
+	css/css-animations/animation-iteration-count-calc.html
+	css/CSS2/values/numbers-units-002.xht
+	css/CSS2/values/numbers-units-003.xht
+	</wpt>
+
 	When written literally,
 	a <dfn export>number</dfn> is either an <a>integer</a>,
 	or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits
@@ -1547,6 +1553,18 @@ Font-relative Lengths: the ''em'', ''ex'', ''cap'', ''ch'', ''ic'', ''rem'', ''l
 			and 'text-orientation' is ''text-orientation/upright'').
 
 			<wpt>
+			css/css-values/ch-unit-001.html
+			css/css-values/ch-unit-002.html
+			css/css-values/ch-unit-003.html
+			css/css-values/ch-unit-004.html
+			css/css-values/ch-unit-008.html
+			css/css-values/ch-unit-009.html
+			css/css-values/ch-unit-010.html
+			css/css-values/ch-unit-011.html
+			css/css-values/ch-unit-012.html
+			css/css-values/ch-unit-016.html
+			css/css-values/ch-unit-017.html
+			css/css-values/line-break-ch-unit.html
 			css/css-values/calc-ch-ex-lang.html
 			</wpt>
 
@@ -1665,6 +1683,8 @@ Viewport-percentage Lengths: the ''vw'', ''vh'', ''vi'', ''vb'', ''vmin'', ''vma
 	any scroll bars are assumed not to exist.
 	<span class='note'>Note that the initial containing block's size is affected by the presence of scrollbars on the viewport.</span>
 
+	ISSUE(1766): Level 3 assumes scrollbars never exist because it was hard to implement. This is making authors unhappy.
+
 	For [=paged media=], the exact definition of the viewport-percentage lengths
 	is deferred to [[!CSS3PAGE]].
 
@@ -4662,7 +4682,8 @@ Additions Since Level 3</h3>
 			and their clarified computed values.
 		<li>Defined the <<dashed-ident>> type.
 		<li>Added ''src()'' to the <<url>> type.
-		<li>Added the ''vi'', ''vb'', ''ic'', ''cap'', ''lh'' and ''rlh'' units.
+		<li>Added the ''vi'', ''vb'', ''ic'', ''cap'', ''lh'' and ''rlh'' length units.
+		<li>Added the ''x'' alias to ''dppx''.
 		<li>Added ''min()'', ''max()'', and ''clamp()''
 			[[#comp-func|comparison functions]].
 		<li>Added ''round()'', ''mod()'', ''rem()'', ''sin()'', ''cos()'', ''tan()'', ''asin()'', ''acos()'', ''atan()'', ''atan2()'', ''pow()'', ''sqrt()'', ''hypot()'', ''log()'', ''exp()'', ''abs()'', ''sign()''