diff --git src/wp-includes/formatting.php src/wp-includes/formatting.php
index fbcde56..329bd64 100644
--- src/wp-includes/formatting.php
+++ src/wp-includes/formatting.php
@@ -4089,7 +4089,7 @@ img.emoji {
 	display: inline !important;
 	border: none !important;
 	box-shadow: none !important;
-	height: 1em !important;
+	max-height: 1em !important;
 	width: 1em !important;
 	margin: 0 .07em !important;
 	vertical-align: -0.1em !important;