[css-color-adjust-1] Add negotiation table.

Author: fantasai

css-color-adjust-1/Overview.bs

@@ -122,6 +122,59 @@ Opting Into a Preferred Color Scheme: the 'color-scheme' property {#color-scheme
 	that affects UI things such as
 	the default colors of form controls and scrollbars
 	as well as the used values of the CSS system colors.
+
+
+	<table class="data">
+	<caption>Interaction of author and user preferences in determining [=used color scheme=] (non-normative)</caption>
+	<colgroup span=2></colgroup>
+	<colgroup span=3></colgroup>
+	<thead>
+		<tr>
+			 <td colspan=2 rowspan=2>
+			 <th colspan=3>User Preference ('prefers-color-scheme')
+		<tr>
+			<th>''@media/prefers-color-scheme/no-preference''
+			<th>''@media/prefers-color-scheme/light''
+			<th>''@media/prefers-color-scheme/dark''
+	<tbody>
+		<tr>
+			<th rowspan=7 style="width: 1.2em; writing-mode: vertical-rl; writing-mode: sideways-lr">Author Preference ('color-scheme')
+			<th>''color-scheme/normal''
+			<td>default
+			<td>default
+			<td>default
+		<tr>
+			<th>''color-scheme/light''
+			<td>light
+			<td>light
+			<td>default
+		<tr>
+			<th>''color-scheme/dark''
+			<td>dark
+			<td>default
+			<td>dark
+		<tr>
+			<th>''color-scheme/light dark''
+			<td>light
+			<td>light
+			<td>dark
+		<tr>
+			<th>''color-scheme/dark light''
+			<td>dark
+			<td>light
+			<td>dark
+		<tr>
+			<th>''color-scheme/only light''
+			<td>light
+			<td>light
+			<td>light
+		<tr>
+			<th>''color-scheme/only dark''
+			<td>dark
+			<td>dark
+			<td>dark
+	</table>
+
 	Values are defined as follows:
 
 	<dl dfn-type=value dfn-for=color-scheme>