Specify URL encoding for links

- Use the document encoding for link elements
- Always use UTF8 for link headers/early hints

Closes whatwg#9715

source

@@ -15548,9 +15548,10 @@ interface <dfn interface>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
    a <span data-x="concept-request-destination">destination</span>, then return null.</p></li>
 
    <li>
-    <p>Let <var>url</var> be the result of <span>encoding-parsing a URL</span> given
-    <var>options</var>'s <span data-x="link options href">href</span>, relative to
-    <var>options</var>'s <span data-x="link options base url">base URL</span>.</p>
+    <p>Let <var>url</var> be the result of applying the <span>URL parser</span> to
+    <var>options</var>'s <span data-x="link options href">href</span>, with
+    <var>options</var>'s <span data-x="link options base url">base URL</span> and
+    <var>options</var>'s <span data-x="link options encoding">encoding</span>.</p>
 
     <p class="XXX">Passing the base URL instead of a document or environment is tracked by <a
     href="https://github.com/whatwg/html/issues/9715">issue #9715</a>.</p>
@@ -15648,6 +15649,9 @@ interface <dfn interface>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
    <dt><dfn data-x="link options base URL">base URL</dfn></dt>
    <dd>A <span>URL</span></dd>
 
+   <dt><dfn data-x="link options encoding">encoding</dfn> (default <span>UTF-8</span>)</dt>
+   <dd>An <span>encoding</span></dd>
+
    <dt><dfn data-x="link options origin">origin</dfn></dt>
    <dd>An <span>origin</span></dd>
 
@@ -15701,6 +15705,10 @@ interface <dfn interface>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
      <dt><span data-x="link options base URL">base URL</span></dt>
      <dd><var>document</var>'s <span>document base URL</span></dd>
 
+     <dt><span data-x="link options encoding">encoding</span></dt>
+     <dd><var>document</var>'s <span data-x="document's
+     character encoding">character encoding</span></dd>
+
      <dt><span data-x="link options origin">origin</span></dt>
      <dd><var>document</var>'s <span data-x="concept-document-origin">origin</span></dd>