[css-values-4] Change complicated list of pow() special-cases to four easier-to-read tables.

Author: tabatkins

css-values-4/Overview.bs

@@ -2708,32 +2708,69 @@ Argument Ranges</h4>
 
 	In ''pow(A, B)'':
 
-	<dl class=switch>
-		: if A is ±∞ and B is 0
-		:: the result is 1
-		: if A is +∞ and B is greater than 0
-		:: the result is +∞
-		: if A is +∞ and B is less than 0
-		:: the result is 0
-		: if A is -∞ and B is greater than 0
-		:: the result is -∞ if B is an odd integer, +∞ otherwise
-		: if A is -∞ and B is less than 0
-		:: the result is 0⁻ if B is an odd integer, 0⁺ otherwise
-
-		: if A is in the (exclusive) range (-1, 1) and B is +∞
-		:: the result is 0⁺
-		: if A is 1 or -1 and B is +∞
-		:: the result is NaN
-		: if A is less than -1 or greater than 1, and B is +∞
-		:: the result is +∞
-
-		: if A is in the (exclusive) range (-1, 1) and B is -∞
-		:: the result is +∞
-		: if A is 1 or -1 and B is -∞
-		:: the result is NaN
-		: if A is less than -1 or greater than 1, and B is -∞
-		:: the result is 0⁺
-	</dl>
+	<table class=data>
+		<thead>
+			<tr><th scope=col colspan=3>A is +∞
+			<tr>
+				<th>B is < 0
+				<th>B is 0
+				<th>B is > 0
+		</thead>
+		<tr>
+			<td>result is +∞
+			<td>result is 1
+			<td>result is 0
+	</table>
+
+	<table class=data>
+		<thead>
+			<tr><th scope=col colspan=3>A is -∞
+			<tr>
+				<th>B is < 0
+				<th>B is 0
+				<th>B is > 0
+		</thead>
+		<tr>
+			<td>result is 0⁻ if B is an odd integer, 0⁺ otherwise
+			<td>result is 1
+			<td>result is -∞ if B is an odd integer, +∞ otherwise
+	</table>
+
+	<table class=data>
+		<thead>
+			<tr><th scope=col colspan=5>B is +∞
+			<tr>
+				<th>A is < -1
+				<th>A is -1
+				<th>-1 < A < 1
+				<th>A is 1
+				<th>A is > 1
+		</thead>
+		<tr>
+			<td>result is +∞
+			<td>result is NaN
+			<td>result is 0⁺
+			<td>result is NaN
+			<td>result is +∞
+	</table>
+
+	<table class=data>
+		<thead>
+			<tr><th scope=col colspan=5>B is -∞
+			<tr>
+				<th>A is < -1
+				<th>A is -1
+				<th>-1 < A < 1
+				<th>A is 1
+				<th>A is > 1
+		</thead>
+		<tr>
+			<td>result is 0⁺
+			<td>result is NaN
+			<td>result is +∞
+			<td>result is NaN
+			<td>result is 0⁺
+	</table>
 
 	In ''sqrt(A)'',
 	if A is +∞,