diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/js/wp-emoji-loader.js
--- a/wp/wp-includes/js/wp-emoji-loader.js	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/js/wp-emoji-loader.js	Tue Dec 15 13:49:49 2020 +0100
@@ -69,6 +69,22 @@
 		switch ( type ) {
 			case 'flag':
 				/*
+				 * Test for Transgender flag compatibility. This flag is shortlisted for the Emoji 13 spec,
+				 * but has landed in Twemoji early, so we can add support for it, too.
+				 *
+				 * To test for support, we try to render it, and compare the rendering to how it would look if
+				 * the browser doesn't render it correctly (white flag emoji + transgender symbol).
+				 */
+				isIdentical = emojiSetsRenderIdentically(
+					[ 0x1F3F3, 0xFE0F, 0x200D, 0x26A7, 0xFE0F ],
+					[ 0x1F3F3, 0xFE0F, 0x200B, 0x26A7, 0xFE0F ]
+				);
+
+				if ( isIdentical ) {
+					return false;
+				}
+
+				/*
 				 * Test for UN flag compatibility. This is the least supported of the letter locale flags,
 				 * so gives us an easy test for full support.
 				 *
@@ -99,17 +115,23 @@
 				return ! isIdentical;
 			case 'emoji':
 				/*
-				 * Love is love.
+				 * So easy, even a baby could do it!
+				 *
+				 *  To test for Emoji 13 support, try to render a new emoji: Man Feeding Baby.
 				 *
-				 * To test for Emoji 12 support, try to render a new emoji: men holding hands, with different skin
-				 * tone modifiers.
+				 * The Man Feeding Baby emoji is a ZWJ sequence combining 👨 Man, a Zero Width Joiner and 🍼 Baby Bottle.
+				 *
+				 * 0xD83D, 0xDC68 == Man emoji.
+				 * 0x200D == Zero-Width Joiner (ZWJ) that links the two code points for the new emoji or
+				 * 0x200B == Zero-Width Space (ZWS) that is rendered for clients not supporting the new emoji.
+				 * 0xD83C, 0xDF7C == Baby Bottle.
 				 *
 				 * When updating this test for future Emoji releases, ensure that individual emoji that make up the
 				 * sequence come from older emoji standards.
 				 */
 				isIdentical = emojiSetsRenderIdentically(
-					[0xD83D, 0xDC68, 0xD83C, 0xDFFE, 0x200D, 0xD83E, 0xDD1D, 0x200D, 0xD83D, 0xDC68, 0xD83C, 0xDFFC],
-					[0xD83D, 0xDC68, 0xD83C, 0xDFFE, 0x200B, 0xD83E, 0xDD1D, 0x200B, 0xD83D, 0xDC68, 0xD83C, 0xDFFC]
+					[0xD83D, 0xDC68, 0x200D, 0xD83C, 0xDF7C],
+					[0xD83D, 0xDC68, 0x200B, 0xD83C, 0xDF7C]
 				);
 
 				return ! isIdentical;