[css-color-4] remove lab from color(), fix #5887

Author: svgeesus

css-color-4/Overview.bs

@@ -3269,7 +3269,7 @@ Profiled, Device-dependent Colors</h2>
 
 <h3 id="predefined">
 Predefined color spaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'', ''rec2020'',
-''xyz'' and ''lab'''.</h3>
+and ''xyz''.</h3>
 
 <!-- Browser tracking bugs:
 	Chromium https://bugs.chromium.org/p/chromium/issues/detail?id=1068610
@@ -3604,35 +3604,13 @@ Predefined color spaces: ''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb''
 					predefined-016.html
 				</wpt>
 
-		<dt><dfn>lab</dfn>
-			<dd>
-				The ''lab'' [[CIELAB]] color space accepts one percentage and two numeric parameters,
-				representing the L, a, and b values.
-				The meaning and valid ranges are <a href="#specifying-lab-lch">the same as the lab() function</a>.
-
-				<div class="example" id="ex-lab-in-color">
-					These are exactly equivalent:
 
-					<pre class="lang-css">
-						<span class="swatch" style="--color: rgb(38.29% 67.27% 93.85%)"></span> lab(67.5345% -8.6911 -41.6019);
-						<span class="swatch" style="--color: rgb(38.29% 67.27% 93.85%)"></span> color(lab 67.5345% -8.6911 -41.6019);
-					</pre>
-				</div>
+	</dl>
 
-				<wpt>
+	<!-- remove this test from wpt -->
+				<!-- <wpt>
 					predefined-013.html
-				</wpt>
-
-				It has the following characteristics:
-
-				<table>
-					<tr>
-						<th>Percentages</th>
-						<td>Required for L; disallowed for a and b.</td>
-					</tr>
-				</table>
-
-	</dl>
+				</wpt> -->
 
 <h4 id="predefined-to-lab">
 Converting predefined color spaces to Lab</h4>