[css-syntax] "Parse a stylesheet" can be invoked on bytes.

Author: SimonSapin

css-syntax/Overview.src.html

@@ -310,7 +310,8 @@ <h3>
 The input byte stream</h3>
 
 	<p>
-		The stream of Unicode code points that comprises the input to the tokenization stage may be initially seen by the user agent as a stream of bytes
+		When parsing a stylesheet,
+		the stream of Unicode code points that comprises the input to the tokenization stage may be initially seen by the user agent as a stream of bytes
 		(typically coming over the network or from the local file system).
 		The bytes encode the actual characters according to a particular character encoding,
 		which the user agent must use to decode the bytes into characters.
@@ -1912,6 +1913,14 @@ <h3>
 		then perform <a href="#tokenization">tokenization</a>
 		to produce a token stream.
 
+	<p>
+		"<i>Parse a stylesheet</i>" can also be invoked on a byte stream,
+		in which case <a href="#the-input-byte-stream">The input byte stream</a>
+		defines how to decode it into Unicode.
+
+	<p class=note>
+		This specification does not define how a byte stream is decoded for other entry points.
+
 	<p class='note'>
 		Other specs can define additional entry points for their own purposes.