[css-values-4] Use consistent capitalization.

Author: fantasai

css-values-4/Overview.bs

@@ -357,21 +357,21 @@ Combining Values: Interpolation, Addition, and Accumulation</h2>
 	and <a href="https://www.w3.org/TR/css-animations/">animations</a>,
 	<dfn export>combine</dfn> two CSS property values.
 	The following combining operations--
-	on the two <a>computed values</a> <var>V<sub>a</sub></var> and <var>V<sub>B</sub></var>
+	on the two <a>computed values</a> <var>V<sub>A</sub></var> and <var>V<sub>B</sub></var>
 	yielding the <a>computed value</a> <var>V<sub>result</sub></var>--
 	are defined:
 
 	<dl export>
 		<dt><dfn id="interpolation" lt="interpolation | interpolate | value interpolation | interpolation procedure">interpolation</dfn>
 		<dd>
 			Given two property values
-			<var>V<sub>a</sub></var> and <var>V<sub>B</sub></var>,
+			<var>V<sub>A</sub></var> and <var>V<sub>B</sub></var>,
 			produces an intermediate value
 			<var>V<sub>result</sub></var>
 			at a distance of <var>p</var>
 			along the interval between
-			<var>V<sub>a</sub></var> and <var>V<sub>B</sub></var>
-			such that <var>p</var> = 0 produces <var>V<sub>a</sub></var>
+			<var>V<sub>A</sub></var> and <var>V<sub>B</sub></var>
+			such that <var>p</var> = 0 produces <var>V<sub>A</sub></var>
 			and <var>p</var> = 1 produces <var>V</var><sub>B</sub>.
 
 			The range of <var>p</var> is (&minus;&infin;, &infin;)
@@ -382,12 +382,12 @@ Combining Values: Interpolation, Addition, and Accumulation</h2>
 		<dt><dfn id="addition" lt="value addition | addition procedure" local-lt="add | addition">addition</dfn>
 		<dd>
 			Given two property values
-			<var>V<sub>a</sub></var> and <var>V<sub>B</sub></var>,
+			<var>V<sub>A</sub></var> and <var>V<sub>B</sub></var>,
 			returns the sum of the two properties,
 			<var>V</var><sub>result</sub>.
 			For addition that is not commutative
 			(for example, matrix multiplication)
-			<var>V<sub>a</sub></var> represents
+			<var>V<sub>A</sub></var> represents
 			the first term of the operation and
 			<var>V<sub>B</sub></var> represents
 			the second.
@@ -404,14 +404,14 @@ Combining Values: Interpolation, Addition, and Accumulation</h2>
 		<dt><dfn id="accumulation" lt="value accumulation | accumulation procedure" local-lt="accumulate | accumulation">accumulation</dfn>
 		<dd>
 			Given two property values
-			<var>V<sub>a</sub></var> and <var>V<sub>B</sub></var>,
+			<var>V<sub>A</sub></var> and <var>V<sub>B</sub></var>,
 			returns the result, <var>V<sub>result</sub></var>,
 			of combining the two operands
 			such that <var>V<sub>B</sub></var>
-			is treated as a <em>delta</em> from <var>V<sub>a</sub></var>.
+			is treated as a <em>delta</em> from <var>V<sub>A</sub></var>.
 			For accumulation that is not commutative
 			(for example, accumulation of mismatched transform lists)
-			<var>V<sub>a</sub></var> represents the first term of the operation
+			<var>V<sub>A</sub></var> represents the first term of the operation
 			and <var>V<sub>B</sub></var> represents the second.
 
 			<div class="note">