Add more UTF-8, UTF-16BE, and UTF-16LE labels

Blink and WebKit have supported these for a long time.

Tests: web-platform-tests/wpt#23427.

Fixes #168.

Author: annevk

encoding.bs

@@ -296,10 +296,13 @@ prescribes, as that is necessary to be compatible with deployed content.
  <tbody>
   <tr><th colspan=2><a href=#the-encoding>The Encoding</a>
   <tr>
-   <td rowspan=3><a>UTF-8</a>
+   <td rowspan=6><a>UTF-8</a>
    <td>"<code>unicode-1-1-utf-8</code>"
+  <tr><td>"<code>unicode11utf8</code>"
+  <tr><td>"<code>unicode20utf8</code>"
   <tr><td>"<code>utf-8</code>"
   <tr><td>"<code>utf8</code>"
+  <tr><td>"<code>x-unicode20utf8</code>"
  <tbody>
   <tr><th colspan=2><a href=#legacy-single-byte-encodings>Legacy single-byte encodings</a>
   <tr>
@@ -597,11 +600,17 @@ prescribes, as that is necessary to be compatible with deployed content.
   <tr><td>"<code>iso-2022-kr</code>"
   <tr><td>"<code>replacement</code>"
   <tr>
-   <td><a>UTF-16BE</a>
-   <td>"<code>utf-16be</code>"
+   <td rowspan=2><a>UTF-16BE</a>
+   <td>"<code>unicodefffe</code>"
+  <tr><td>"<code>utf-16be</code>"
   <tr>
-   <td rowspan=2><a>UTF-16LE</a>
-   <td>"<code>utf-16</code>"
+   <td rowspan=7><a>UTF-16LE</a>
+   <td>"<code>csunicode</code>"
+  <tr><td>"<code>iso-10646-ucs-2</code>"
+  <tr><td>"<code>ucs-2</code>"
+  <tr><td>"<code>unicode</code>"
+  <tr><td>"<code>unicodefeff</code>"
+  <tr><td>"<code>utf-16</code>"
   <tr><td>"<code>utf-16le</code>"
   <tr>
    <td><a>x-user-defined</a>
@@ -3186,9 +3195,8 @@ its <a>is UTF-16BE decoder</a> set to true.
 
 <h3 id=utf-16le dfn export>UTF-16LE</h3>
 
-<p class="note no-backref">Both "<code>utf-16</code>" and
-"<code>utf-16le</code>" are <a>labels</a> for
-<a>UTF-16LE</a> to deal with deployed content.
+<p class="note no-backref">"<code>utf-16</code>" is a <a>label</a> for <a>UTF-16LE</a> to deal with
+deployed content.
 
 
 <h4 id=utf-16le-decoder dfn export>UTF-16LE decoder</h4>

encodings.json

@@ -4,8 +4,11 @@
       {
         "labels": [
           "unicode-1-1-utf-8",
+          "unicode11utf8",
+          "unicode20utf8",
           "utf-8",
-          "utf8"
+          "utf8",
+          "x-unicode20utf8"
         ],
         "name": "UTF-8"
       }
@@ -433,12 +436,18 @@
       },
       {
         "labels": [
+          "unicodefffe",
           "utf-16be"
         ],
         "name": "UTF-16BE"
       },
       {
         "labels": [
+          "csunicode",
+          "iso-10646-ucs-2",
+          "ucs-2",
+          "unicode",
+          "unicodefeff",
           "utf-16",
           "utf-16le"
         ],