[css-values-4] Per WG resolution, URLs are always utf-8 when used over the network. #9301

Author: tabatkins

css-values-4/Overview.bs

@@ -48,6 +48,24 @@ dl:not(.switch) dt { display: inline; }
 td > small { display: block; }
 </style>
 
+<style>
+/* Put nice boxes around each algorithm. */
+[data-algorithm]:not(.heading) {
+	padding: .5em;
+	border: thin solid #ddd; border-radius: .5em;
+	margin: .5em calc(-0.5em - 1px);
+}
+[data-algorithm]:not(.heading) > :first-child {
+	margin-top: 0;
+}
+[data-algorithm]:not(.heading) > :last-child {
+	margin-bottom: 0;
+}
+[data-algorithm] [data-algorithm] {
+	margin: 1em 0;
+}
+</style>
+
 <h2 id="intro">
 Introduction</h2>
 
@@ -1212,6 +1230,15 @@ URL Processing Model</h4>
 			with [=fetch/processresponseconsumebody=] set to |processResponse|.
 	</div>
 
+	Some legacy implementations preserved the original encoding of URLs
+	(as represented in the stylesheet)
+	and reproduced that encoding when communicating over the network.
+	UAs <em>must not</em> do this;
+	when it's necessary to re-encode a URL into bytes
+	to communicate over the network,
+	the URL must be encoded as UTF-8,
+	regardless of the original stylesheet encoding.
+
 <h2 id="numeric-types">
 Numeric Data Types</h2>