diff -r 34716fd837a4 -r be944660c56a wp/wp-includes/class-wp-editor.php
--- a/wp/wp-includes/class-wp-editor.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-includes/class-wp-editor.php	Wed Sep 21 18:19:35 2022 +0200
@@ -249,7 +249,7 @@
 				$toolbar_id = 'qt_' . $editor_id_attr . '_toolbar';
 			}
 
-			$quicktags_toolbar = '<div id="' . $toolbar_id . '" class="quicktags-toolbar"></div>';
+			$quicktags_toolbar = '<div id="' . $toolbar_id . '" class="quicktags-toolbar hide-if-no-js"></div>';
 		}
 
 		/**
@@ -1300,8 +1300,8 @@
 
 				'Row'                                  => __( 'Row' ),
 				'Rows'                                 => __( 'Rows' ),
-				'Column'                               => _x( 'Column', 'table column' ),
-				'Cols'                                 => _x( 'Cols', 'table columns' ),
+				'Column'                               => __( 'Column' ),
+				'Cols'                                 => __( 'Columns' ),
 				'Cell'                                 => _x( 'Cell', 'table cell' ),
 				'Header cell'                          => __( 'Header cell' ),
 				'Header'                               => _x( 'Header', 'table header' ),
@@ -1663,20 +1663,31 @@
 		?>
 
 		( function() {
-			var init, id, $wrap;
+			var initialized = [];
+			var initialize  = function() {
+				var init, id, inPostbox, $wrap;
+				var readyState = document.readyState;
 
-			if ( typeof tinymce !== 'undefined' ) {
-				if ( tinymce.Env.ie && tinymce.Env.ie < 11 ) {
-					tinymce.$( '.wp-editor-wrap ' ).removeClass( 'tmce-active' ).addClass( 'html-active' );
+				if ( readyState !== 'complete' && readyState !== 'interactive' ) {
 					return;
 				}
 
 				for ( id in tinyMCEPreInit.mceInit ) {
-					init = tinyMCEPreInit.mceInit[id];
-					$wrap = tinymce.$( '#wp-' + id + '-wrap' );
+					if ( initialized.indexOf( id ) > -1 ) {
+						continue;
+					}
+
+					init      = tinyMCEPreInit.mceInit[id];
+					$wrap     = tinymce.$( '#wp-' + id + '-wrap' );
+					inPostbox = $wrap.parents( '.postbox' ).length > 0;
 
-					if ( ( $wrap.hasClass( 'tmce-active' ) || ! tinyMCEPreInit.qtInit.hasOwnProperty( id ) ) && ! init.wp_skip_init ) {
+					if (
+						! init.wp_skip_init &&
+						( $wrap.hasClass( 'tmce-active' ) || ! tinyMCEPreInit.qtInit.hasOwnProperty( id ) ) &&
+						( readyState === 'complete' || ( ! inPostbox && readyState === 'interactive' ) )
+					) {
 						tinymce.init( init );
+						initialized.push( id );
 
 						if ( ! window.wpActiveEditor ) {
 							window.wpActiveEditor = id;
@@ -1685,6 +1696,18 @@
 				}
 			}
 
+			if ( typeof tinymce !== 'undefined' ) {
+				if ( tinymce.Env.ie && tinymce.Env.ie < 11 ) {
+					tinymce.$( '.wp-editor-wrap ' ).removeClass( 'tmce-active' ).addClass( 'html-active' );
+				} else {
+					if ( document.readyState === 'complete' ) {
+						initialize();
+					} else {
+						document.addEventListener( 'readystatechange', initialize );
+					}
+				}
+			}
+
 			if ( typeof quicktags !== 'undefined' ) {
 				for ( id in tinyMCEPreInit.qtInit ) {
 					quicktags( tinyMCEPreInit.qtInit[id] );