diff --git a/src/wp-includes/js/tinymce/plugins/wpview/plugin.js b/src/wp-includes/js/tinymce/plugins/wpview/plugin.js
index e0dbafacca..2d390c1480 100644
--- a/src/wp-includes/js/tinymce/plugins/wpview/plugin.js
+++ b/src/wp-includes/js/tinymce/plugins/wpview/plugin.js
@@ -354,11 +354,13 @@ tinymce.PluginManager.add( 'wpview', function( editor ) {
 	});
 
 	// Excludes arrow keys, delete, backspace, enter, space bar.
+	// Ref: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent.keyCode
 	function isSpecialKey( key ) {
 		return ( ( key <= 47 && key !== VK.SPACEBAR && key !== VK.ENTER && key !== VK.DELETE && key !== VK.BACKSPACE && ( key < 37 || key > 40 ) ) ||
-			key === 144 || key === 145 || // Num Lock, Scroll Lock
+			key >= 224 || // OEM or non-printable 
+			( key >= 144 && key <= 150 ) || // Num Lock, Scroll Lock, OEM
 			( key >= 91 && key <= 93 ) || // Windows keys
-			( key >= 112 && key <= 123 ) ); // F keys
+			( key >= 112 && key <= 135 ) ); // F keys
 	}
 
 	// (De)select views when arrow keys are used to navigate the content of the editor.