diff --git a/src/js/_enqueues/admin/comment.js b/src/js/_enqueues/admin/comment.js
index d815eee184..4e4f3c5ed9 100644
--- a/src/js/_enqueues/admin/comment.js
+++ b/src/js/_enqueues/admin/comment.js
@@ -11,7 +11,7 @@
  *
  * @param {jQuery} $ The jQuery object.
  */
-jQuery(document).ready( function($) {
+jQuery( function($) {
 
 	postboxes.add_postbox_toggles('comment');
 
diff --git a/src/js/_enqueues/admin/common.js b/src/js/_enqueues/admin/common.js
index f0807f989e..636237f0b4 100644
--- a/src/js/_enqueues/admin/common.js
+++ b/src/js/_enqueues/admin/common.js
@@ -483,7 +483,7 @@ window.columns = {
 	}
 };
 
-$document.ready(function(){columns.init();});
+$( function() { columns.init(); } );
 
 /**
  * Validates that the required form fields are not empty.
@@ -802,7 +802,7 @@ $availableStructureTags.on( 'click', function() {
 	}
 } );
 
-$document.ready( function() {
+$( function() {
 	var checks, first, last, checked, sliced, mobileEvent, transitionTimeout, focusedRowActions,
 		lastClicked = false,
 		pageInput = $('input.current-page'),
@@ -1706,7 +1706,7 @@ $document.ready( function() {
 			});
 
 			self.trigger();
-			$document.on( 'wp-window-resized.wp-responsive', $.proxy( this.trigger, this ) );
+			$document.on( 'wp-window-resized.wp-responsive', this.trigger.bind( this ) );
 
 			// This needs to run later as UI Sortable may be initialized later on $(document).ready().
 			$window.on( 'load.wp-responsive', this.maybeDisableSortables );
@@ -1889,7 +1889,7 @@ $document.ready( function() {
 		$( '.aria-button-if-js' ).attr( 'role', 'button' );
 	}
 
-	$( document ).ajaxComplete( function() {
+	$( document ).on( 'ajaxComplete', function() {
 		aria_button_if_js();
 	});
 
@@ -2008,7 +2008,7 @@ $document.ready( function() {
  *
  * @since 5.5.0
  */
-$document.ready( function( $ ) {
+$( function( $ ) {
 	var $overwrite, $warning;
 
 	if ( ! $body.hasClass( 'update-php' ) ) {
diff --git a/src/js/_enqueues/admin/custom-background.js b/src/js/_enqueues/admin/custom-background.js
index 8204fdfeca..f83db00af0 100644
--- a/src/js/_enqueues/admin/custom-background.js
+++ b/src/js/_enqueues/admin/custom-background.js
@@ -12,7 +12,7 @@
  * @requires jQuery
  */
 (function($) {
-	$(document).ready(function() {
+	$( function() {
 		var frame,
 			bgImage = $( '#custom-background-image' );
 
diff --git a/src/js/_enqueues/admin/edit-comments.js b/src/js/_enqueues/admin/edit-comments.js
index 31d0c551a7..96ca1f9f48 100644
--- a/src/js/_enqueues/admin/edit-comments.js
+++ b/src/js/_enqueues/admin/edit-comments.js
@@ -1225,7 +1225,7 @@ window.commentReply = {
 	}
 };
 
-$(document).ready(function(){
+$( function(){
 	var make_hotkeys_redirect, edit_comment, toggle_all, make_bulk;
 
 	setCommentsList();
diff --git a/src/js/_enqueues/admin/inline-edit-post.js b/src/js/_enqueues/admin/inline-edit-post.js
index 70c5996496..4d297e0c1a 100644
--- a/src/js/_enqueues/admin/inline-edit-post.js
+++ b/src/js/_enqueues/admin/inline-edit-post.js
@@ -516,10 +516,16 @@ window.wp = window.wp || {};
 	}
 };
 
-$( document ).ready( function(){ inlineEditPost.init(); } );
+$( function() { inlineEditPost.init(); } );
 
 // Show/hide locks on posts.
-$( document ).on( 'heartbeat-tick.wp-check-locked-posts', function( e, data ) {
+$( function() {
+
+	// Set the heartbeat interval to 15 seconds.
+	if ( typeof wp !== 'undefined' && wp.heartbeat ) {
+		wp.heartbeat.interval( 15 );
+	}
+}).on( 'heartbeat-tick.wp-check-locked-posts', function( e, data ) {
 	var locked = data['wp-check-locked-posts'] || {};
 
 	$('#the-list tr').each( function(i, el) {
@@ -560,12 +566,6 @@ $( document ).on( 'heartbeat-tick.wp-check-locked-posts', function( e, data ) {
 	if ( check.length ) {
 		data['wp-check-locked-posts'] = check;
 	}
-}).ready( function() {
-
-	// Set the heartbeat interval to 15 seconds.
-	if ( typeof wp !== 'undefined' && wp.heartbeat ) {
-		wp.heartbeat.interval( 15 );
-	}
 });
 
 })( jQuery, window.wp );
diff --git a/src/js/_enqueues/admin/inline-edit-tax.js b/src/js/_enqueues/admin/inline-edit-tax.js
index f8b52d63e7..86e3498cd1 100644
--- a/src/js/_enqueues/admin/inline-edit-tax.js
+++ b/src/js/_enqueues/admin/inline-edit-tax.js
@@ -289,6 +289,6 @@ window.inlineEditTax = {
 	}
 };
 
-$(document).ready(function(){inlineEditTax.init();});
+$( function() { inlineEditTax.init(); } );
 
 })( jQuery, window.wp );
diff --git a/src/js/_enqueues/admin/link.js b/src/js/_enqueues/admin/link.js
index 3bb7378ba8..1456ba9530 100644
--- a/src/js/_enqueues/admin/link.js
+++ b/src/js/_enqueues/admin/link.js
@@ -4,7 +4,7 @@
 
 /* global postboxes, deleteUserSetting, setUserSetting, getUserSetting */
 
-jQuery(document).ready( function($) {
+jQuery( function($) {
 
 	var newCat, noSyncChecks = false, syncChecks, catAddAfter;
 
@@ -81,7 +81,11 @@ jQuery(document).ready( function($) {
 		$(s.what + ' response_data', r).each( function() {
 			var t = $($(this).text());
 			t.find( 'label' ).each( function() {
-				var th = $(this), val = th.find('input').val(), id = th.find('input')[0].id, name = $.trim( th.text() ), o;
+				var th = $(this),
+					val = th.find('input').val(),
+					id = th.find('input')[0].id,
+					name = th.text().trim(),
+					o;
 				$('#' + id).on( 'change', syncChecks );
 				o = $( '<option value="' +  parseInt( val, 10 ) + '"></option>' ).text( name );
 			} );
diff --git a/src/js/_enqueues/admin/media.js b/src/js/_enqueues/admin/media.js
index fa11305117..13d46e485b 100644
--- a/src/js/_enqueues/admin/media.js
+++ b/src/js/_enqueues/admin/media.js
@@ -140,7 +140,7 @@
 	 *
 	 * @return {void}
 	 */
-	$( document ).ready( function() {
+	$( function() {
 		var settings, $mediaGridWrap = $( '#wp-media-grid' );
 
 		// Opens a manage media frame into the grid.
diff --git a/src/js/_enqueues/admin/plugin-install.js b/src/js/_enqueues/admin/plugin-install.js
index 7cd6fd5bad..9b43b53e13 100644
--- a/src/js/_enqueues/admin/plugin-install.js
+++ b/src/js/_enqueues/admin/plugin-install.js
@@ -6,7 +6,7 @@
 
 /* global tb_click, tb_remove, tb_position */
 
-jQuery( document ).ready( function( $ ) {
+jQuery( function( $ ) {
 
 	var tbWindow,
 		$iframeBody,
diff --git a/src/js/_enqueues/admin/post.js b/src/js/_enqueues/admin/post.js
index a83f834d78..b0fca99135 100644
--- a/src/js/_enqueues/admin/post.js
+++ b/src/js/_enqueues/admin/post.js
@@ -260,7 +260,9 @@ window.wp = window.wp || {};
 		timeout = window.setTimeout( function(){ check = true; }, 300000 );
 	}
 
-	$(document).on( 'heartbeat-send.wp-refresh-nonces', function( e, data ) {
+	$( function() {
+		schedule();
+	}).on( 'heartbeat-send.wp-refresh-nonces', function( e, data ) {
 		var post_id,
 			$authCheck = $('#wp-auth-check-wrap');
 
@@ -286,15 +288,13 @@ window.wp = window.wp || {};
 			if ( nonces.heartbeatNonce )
 				window.heartbeatSettings.nonce = nonces.heartbeatNonce;
 		}
-	}).ready( function() {
-		schedule();
 	});
 }(jQuery));
 
 /**
  * All post and postbox controls and functionality.
  */
-jQuery(document).ready( function($) {
+jQuery( function($) {
 	var stamp, visibility, $submitButtons, updateVisibility, updateText,
 		$textarea = $('#content'),
 		$document = $(document),
@@ -661,7 +661,7 @@ jQuery(document).ready( function($) {
 		$('#' + taxonomy + '-add-toggle').on( 'click', function( e ) {
 			e.preventDefault();
 			$('#' + taxonomy + '-adder').toggleClass( 'wp-hidden-children' );
-			$('a[href="#' + taxonomy + '-all"]', '#' + taxonomy + '-tabs').click();
+			$('a[href="#' + taxonomy + '-all"]', '#' + taxonomy + '-tabs').trigger( 'click' );
 			$('#new'+taxonomy).trigger( 'focus' );
 		});
 
diff --git a/src/js/_enqueues/admin/privacy-tools.js b/src/js/_enqueues/admin/privacy-tools.js
index 331af439c9..e5fceb86d7 100644
--- a/src/js/_enqueues/admin/privacy-tools.js
+++ b/src/js/_enqueues/admin/privacy-tools.js
@@ -5,7 +5,7 @@
  */
 
 // Privacy request action handling.
-jQuery( document ).ready( function( $ ) {
+jQuery( function( $ ) {
 	var __ = wp.i18n.__,
 		copiedNoticeTimeout;
 
diff --git a/src/js/_enqueues/admin/site-health.js b/src/js/_enqueues/admin/site-health.js
index aabc91d6a1..c0e2454224 100644
--- a/src/js/_enqueues/admin/site-health.js
+++ b/src/js/_enqueues/admin/site-health.js
@@ -6,7 +6,7 @@
 
 /* global ajaxurl, ClipboardJS, SiteHealth, wp */
 
-jQuery( document ).ready( function( $ ) {
+jQuery( function( $ ) {
 
 	var __ = wp.i18n.__,
 		_n = wp.i18n._n,
diff --git a/src/js/_enqueues/admin/tags-box.js b/src/js/_enqueues/admin/tags-box.js
index fbbb355861..99d664691c 100644
--- a/src/js/_enqueues/admin/tags-box.js
+++ b/src/js/_enqueues/admin/tags-box.js
@@ -27,7 +27,8 @@
 
 		// Trim the values and ensure they are unique.
 		$.each( array, function( key, val ) {
-			val = $.trim( val );
+			val = val || '';
+			val = val.trim();
 
 			if ( val && $.inArray( val, out ) === -1 ) {
 				out.push( val );
@@ -96,7 +97,8 @@
 
 			// Sanitize the current tags and push them as if they're new tags.
 			$.each( current_tags, function( key, val ) {
-				val = $.trim( val );
+				val = val || '';
+				val = val.trim();
 				if ( val ) {
 					new_tags.push( val );
 				}
@@ -148,7 +150,8 @@
 			$.each( current_tags, function( key, val ) {
 				var listItem, xbutton;
 
-				val = $.trim( val );
+				val = val || '';
+				val = val.trim();
 
 				if ( ! val )
 					return;
diff --git a/src/js/_enqueues/admin/tags.js b/src/js/_enqueues/admin/tags.js
index 6c4b8b7a2e..6c25e55537 100644
--- a/src/js/_enqueues/admin/tags.js
+++ b/src/js/_enqueues/admin/tags.js
@@ -9,7 +9,7 @@
 
  /* global ajaxurl, wpAjax, showNotice, validateForm */
 
-jQuery(document).ready(function($) {
+jQuery( function($) {
 
 	var addingTerm = false;
 
diff --git a/src/js/_enqueues/admin/user-profile.js b/src/js/_enqueues/admin/user-profile.js
index 06cfba2e12..3b5e26f977 100644
--- a/src/js/_enqueues/admin/user-profile.js
+++ b/src/js/_enqueues/admin/user-profile.js
@@ -319,7 +319,7 @@
 		}
 	}
 
-	$(document).ready( function() {
+	$( function() {
 		var $colorpicker, $stylesheet, user_id, current_user_id,
 			select       = $( '#display_name' ),
 			current_name = select.val(),
@@ -374,7 +374,7 @@
 					return;
 				}
 
-				var display_name = $.trim( this.value ) || current_name;
+				var display_name = this.value.trim() || current_name;
 
 				greeting.text( display_name );
 			} );
@@ -466,7 +466,7 @@
 	 * to avoid double clicking the button to retrieve the first generated password.
 	 * See ticket #39638.
 	 */
-	$( document ).ready( function() {
+	$( function() {
 		if ( $( '.reset-pass-submit' ).length ) {
 			$( '.reset-pass-submit button.wp-generate-pw' ).trigger( 'click' );
 		}
diff --git a/src/js/_enqueues/admin/widgets.js b/src/js/_enqueues/admin/widgets.js
index 245b0c12b2..e8fc42507d 100644
--- a/src/js/_enqueues/admin/widgets.js
+++ b/src/js/_enqueues/admin/widgets.js
@@ -741,7 +741,7 @@ window.wpWidgets = {
 	}
 };
 
-$document.ready( function(){ wpWidgets.init(); } );
+$( function(){ wpWidgets.init(); } );
 
 })(jQuery);
 
diff --git a/src/js/_enqueues/admin/xfn.js b/src/js/_enqueues/admin/xfn.js
index fdbe6a368f..cf7fcf8bb7 100644
--- a/src/js/_enqueues/admin/xfn.js
+++ b/src/js/_enqueues/admin/xfn.js
@@ -4,7 +4,7 @@
  * @deprecated 3.5.0
  * @output wp-admin/js/xfn.js
  */
-jQuery( document ).ready(function( $ ) {
+jQuery( function( $ ) {
 	$( '#link_rel' ).prop( 'readonly', true );
 	$( '#linkxfndiv input' ).on( 'click keyup', function() {
 		var isMe = $( '#me' ).is( ':checked' ), inputs = '';
diff --git a/src/js/_enqueues/lib/accordion.js b/src/js/_enqueues/lib/accordion.js
index 7eacbec966..c420e8ccb8 100644
--- a/src/js/_enqueues/lib/accordion.js
+++ b/src/js/_enqueues/lib/accordion.js
@@ -31,7 +31,7 @@
 
 ( function( $ ){
 
-	$( document ).ready( function () {
+	$( function () {
 
 		// Expand/Collapse accordion sections on click.
 		$( '.accordion-container' ).on( 'click keydown', '.accordion-section-title', function( e ) {
diff --git a/src/js/_enqueues/lib/ajax-response.js b/src/js/_enqueues/lib/ajax-response.js
index 6b356d8a94..38816f3c38 100644
--- a/src/js/_enqueues/lib/ajax-response.js
+++ b/src/js/_enqueues/lib/ajax-response.js
@@ -65,6 +65,6 @@ window.wpAjax = jQuery.extend( {
 }, wpAjax || { noPerm: 'Sorry, you are not allowed to do that.', broken: 'Something went wrong.' } );
 
 // Basic form validation.
-jQuery(document).ready( function($){
+jQuery( function($){
 	$('form.validate').on( 'submit', function() { return wpAjax.validateForm( $(this) ); } );
 });
diff --git a/src/js/_enqueues/lib/auth-check.js b/src/js/_enqueues/lib/auth-check.js
index c574c992ef..44ff15a153 100644
--- a/src/js/_enqueues/lib/auth-check.js
+++ b/src/js/_enqueues/lib/auth-check.js
@@ -144,15 +144,7 @@
 	 * @param {Object} e The heartbeat-tick event that has been triggered.
 	 * @param {Object} data Response data.
 	 */
-	$( document ).on( 'heartbeat-tick.wp-auth-check', function( e, data ) {
-		if ( 'wp-auth-check' in data ) {
-			if ( ! data['wp-auth-check'] && wrap.hasClass( 'hidden' ) && ! tempHidden ) {
-				show();
-			} else if ( data['wp-auth-check'] && ! wrap.hasClass( 'hidden' ) ) {
-				hide();
-			}
-		}
-	}).ready( function() {
+	$( function() {
 
 		/**
 		 * Hides the authentication form popup when the close icon is clicked.
@@ -166,6 +158,14 @@
 			hide();
 			setShowTimeout();
 		});
+	}).on( 'heartbeat-tick.wp-auth-check', function( e, data ) {
+		if ( 'wp-auth-check' in data ) {
+			if ( ! data['wp-auth-check'] && wrap.hasClass( 'hidden' ) && ! tempHidden ) {
+				show();
+			} else if ( data['wp-auth-check'] && ! wrap.hasClass( 'hidden' ) ) {
+				hide();
+			}
+		}
 	});
 
 }(jQuery));
diff --git a/src/js/_enqueues/lib/color-picker.js b/src/js/_enqueues/lib/color-picker.js
index f41f00af18..600e0235b3 100644
--- a/src/js/_enqueues/lib/color-picker.js
+++ b/src/js/_enqueues/lib/color-picker.js
@@ -101,7 +101,7 @@
 			}
 
 			// Bind the close event.
-			self.close = $.proxy( self.close, self );
+			self.close = self.close.bind( self );
 
 			self.initialValue = el.val();
 
@@ -277,7 +277,7 @@
 				if ( me.hasClass( 'wp-picker-clear' ) ) {
 					self.element.val( '' );
 					self.toggler.css( 'backgroundColor', '' );
-					if ( $.isFunction( self.options.clear ) ) {
+					if ( typeof self.options.clear === 'function' ) {
 						self.options.clear.call( this, event );
 					}
 				} else if ( me.hasClass( 'wp-picker-default' ) ) {
diff --git a/src/js/_enqueues/lib/gallery.js b/src/js/_enqueues/lib/gallery.js
index e1c34b5b9f..d493946c5b 100644
--- a/src/js/_enqueues/lib/gallery.js
+++ b/src/js/_enqueues/lib/gallery.js
@@ -4,7 +4,7 @@
 
 /* global unescape, getUserSetting, setUserSetting, wpgallery, tinymce */
 
-jQuery(document).ready(function($) {
+jQuery( function($) {
 	var gallerySortable, gallerySortableInit, sortIt, clearAll, w, desc = false;
 
 	gallerySortableInit = function() {
diff --git a/src/js/_enqueues/lib/link.js b/src/js/_enqueues/lib/link.js
index 7fa60a8e83..89adf33796 100644
--- a/src/js/_enqueues/lib/link.js
+++ b/src/js/_enqueues/lib/link.js
@@ -93,7 +93,7 @@
 
 		// If URL wasn't corrected last time and doesn't start with http:, https:, ? # or /, prepend http://.
 		correctURL: function () {
-			var url = $.trim( inputs.url.val() );
+			var url = inputs.url.val().trim();
 
 			if ( url && correctedURL !== url && ! /^(?:[a-z]+:|#|\?|\.|\/)/.test( url ) ) {
 				inputs.url.val( 'http://' + url );
@@ -238,7 +238,7 @@
 				linkText = linkNode.text();
 				href = linkNode.attr( 'href' );
 
-				if ( ! $.trim( linkText ) ) {
+				if ( ! linkText.trim() ) {
 					linkText = text || '';
 				}
 
@@ -312,7 +312,7 @@
 			wpLink.correctURL();
 
 			return {
-				href: $.trim( inputs.url.val() ),
+				href: inputs.url.val().trim(),
 				target: inputs.openInNewTab.prop( 'checked' ) ? '_blank' : null
 			};
 		},
@@ -425,7 +425,7 @@
 				if ( ! $link.length ) {
 					editor.execCommand( 'mceInsertLink', false, { href: '_wp_link_placeholder', 'data-wp-temp-link': 1 } );
 					$link = editor.$( 'a[data-wp-temp-link="1"]' ).removeAttr( 'data-wp-temp-link' );
-					hasText = $.trim( $link.text() );
+					hasText = $link.text().trim();
 				}
 
 				if ( ! $link.length ) {
@@ -483,7 +483,8 @@
 				}
 			}
 
-			selection = $.trim( selection );
+			selection = selection || '';
+			selection = selection.trim();
 
 			if ( selection && emailRegexp.test( selection ) ) {
 				// Selection is email address.
@@ -797,5 +798,5 @@
 		}
 	});
 
-	$( document ).ready( wpLink.init );
+	$( wpLink.init );
 })( jQuery, window.wpLinkL10n, window.wp );
diff --git a/src/js/_enqueues/lib/nav-menu.js b/src/js/_enqueues/lib/nav-menu.js
index bd031d9905..d3b9663487 100644
--- a/src/js/_enqueues/lib/nav-menu.js
+++ b/src/js/_enqueues/lib/nav-menu.js
@@ -1331,7 +1331,7 @@
 
 	};
 
-	$(document).ready(function() {
+	$( function() {
 
 		wpNavMenu.init();
 
diff --git a/src/js/_enqueues/lib/quicktags.js b/src/js/_enqueues/lib/quicktags.js
index 2224cbed84..4b1a80fa28 100644
--- a/src/js/_enqueues/lib/quicktags.js
+++ b/src/js/_enqueues/lib/quicktags.js
@@ -57,7 +57,7 @@ window.edToolbar = function(){};
 		var t, i, DOMContentLoaded, _tryReady;
 
 		if ( typeof jQuery !== 'undefined' ) {
-			jQuery(document).ready(func);
+			jQuery( func );
 		} else {
 			t = _domReady;
 			t.funcs = [];
diff --git a/src/js/_enqueues/lib/user-suggest.js b/src/js/_enqueues/lib/user-suggest.js
index 19770df075..f05b7ffa88 100644
--- a/src/js/_enqueues/lib/user-suggest.js
+++ b/src/js/_enqueues/lib/user-suggest.js
@@ -14,7 +14,7 @@
 
 (function( $ ) {
 	var id = ( typeof current_site_id !== 'undefined' ) ? '&site_id=' + current_site_id : '';
-	$(document).ready( function() {
+	$( function() {
 		var position = { offset: '0, -1' };
 		if ( typeof isRtl !== 'undefined' && isRtl ) {
 			position.my = 'right top';
diff --git a/src/js/_enqueues/wp/autosave.js b/src/js/_enqueues/wp/autosave.js
index 0351388c4a..29d81e6e9d 100644
--- a/src/js/_enqueues/wp/autosave.js
+++ b/src/js/_enqueues/wp/autosave.js
@@ -582,7 +582,7 @@ window.autosave = function() {
 			 * Don't run if the post type supports neither 'editor' (textarea#content) nor 'excerpt'.
 			 */
 			if ( checkStorage() && blog_id && ( $('#content').length || $('#excerpt').length ) ) {
-				$document.ready( run );
+				$( run );
 			}
 
 			return {
@@ -798,7 +798,9 @@ window.autosave = function() {
 			 *
 			 * @return {void}
 			 */
-			$document.on( 'heartbeat-send.autosave', function( event, data ) {
+			$( function() {
+				_schedule();
+			}).on( 'heartbeat-send.autosave', function( event, data ) {
 				var autosaveData = save();
 
 				if ( autosaveData ) {
@@ -848,8 +850,6 @@ window.autosave = function() {
 			}).on( 'heartbeat-connection-restored.autosave', function() {
 				$('#lost-connection-notice').hide();
 				enableButtons();
-			}).ready( function() {
-				_schedule();
 			});
 
 			return {
@@ -873,7 +873,10 @@ window.autosave = function() {
 		 *
 		 * @return {void}
 		 */
-		$document.on( 'tinymce-editor-init.autosave', function( event, editor ) {
+		$( function() {
+			// Set the initial compare string in case TinyMCE is not used or not loaded first.
+			setInitialCompare();
+		}).on( 'tinymce-editor-init.autosave', function( event, editor ) {
 			// Reset the initialCompare data after the TinyMCE instances have been initialized.
 			if ( 'content' === editor.id || 'excerpt' === editor.id ) {
 				window.setTimeout( function() {
@@ -881,9 +884,6 @@ window.autosave = function() {
 					setInitialCompare();
 				}, 1000 );
 			}
-		}).ready( function() {
-			// Set the initial compare string in case TinyMCE is not used or not loaded first.
-			setInitialCompare();
 		});
 
 		return {
diff --git a/src/js/_enqueues/wp/customize/base.js b/src/js/_enqueues/wp/customize/base.js
index a088c34386..24a5bf6669 100644
--- a/src/js/_enqueues/wp/customize/base.js
+++ b/src/js/_enqueues/wp/customize/base.js
@@ -197,7 +197,7 @@ window.wp = window.wp || {};
 
 			$.extend( this, options || {} );
 
-			this.set = $.proxy( this.set, this );
+			this.set = this.set.bind( this );
 		},
 
 		/*
@@ -734,7 +734,7 @@ window.wp = window.wp || {};
 			 * This will prevent every Messenger's receive function from being
 			 * unbound when calling $.off( 'message', this.receive );
 			 */
-			this.receive = $.proxy( this.receive, this );
+			this.receive = this.receive.bind( this );
 			this.receive.guid = $.guid++;
 
 			$( window ).on( 'message', this.receive );
diff --git a/src/js/_enqueues/wp/customize/controls.js b/src/js/_enqueues/wp/customize/controls.js
index 45122597f0..c8ee3de8df 100644
--- a/src/js/_enqueues/wp/customize/controls.js
+++ b/src/js/_enqueues/wp/customize/controls.js
@@ -289,7 +289,7 @@
 					collection.focusContainer.focus();
 				}
 			} else if ( collection.previousActiveElement ) {
-				$( collection.previousActiveElement ).focus();
+				$( collection.previousActiveElement ).trigger( 'focus' );
 				collection.previousActiveElement = null;
 			}
 
@@ -1592,7 +1592,7 @@
 				if ( args.unchanged ) {
 					expand = args.completeCallback;
 				} else {
-					expand = $.proxy( function() {
+					expand = function() {
 						section._animateChangeExpanded( function() {
 							sectionTitle.attr( 'tabindex', '-1' );
 							backBtn.attr( 'tabindex', '0' );
@@ -1609,7 +1609,7 @@
 						content.addClass( 'open' );
 						overlay.addClass( 'section-open' );
 						api.state( 'expandedSection' ).set( section );
-					}, this );
+					}.bind( this );
 				}
 
 				if ( ! args.allowMultiple ) {
@@ -2696,12 +2696,12 @@
 				if ( args.unchanged ) {
 					expand = args.completeCallback;
 				} else {
-					expand = $.proxy( function() {
+					expand = function() {
 						section._animateChangeExpanded( function() {
 							sectionTitle.attr( 'tabindex', '-1' );
 							backBtn.attr( 'tabindex', '0' );
 
-							backBtn.focus();
+							backBtn.trigger( 'focus' );
 							content.css( 'top', '' );
 							container.scrollTop( 0 );
 
@@ -2711,7 +2711,7 @@
 						} );
 
 						content.addClass( 'open' );
-					}, this );
+					}.bind( this );
 				}
 
 				if ( section.panel() ) {
@@ -2956,7 +2956,7 @@
 						topPanel.attr( 'tabindex', '-1' );
 						backBtn.attr( 'tabindex', '0' );
 
-						backBtn.focus();
+						backBtn.trigger( 'focus' );
 						accordionSection.css( 'top', '' );
 						container.scrollTop( 0 );
 
@@ -3874,9 +3874,9 @@
 
 			control.container.toggleClass( 'has-notifications', 0 !== notifications.length );
 			control.container.toggleClass( 'has-error', hasError );
-			container.empty().append( $.trim(
-				control.notificationsTemplate( { notifications: notifications, altNotice: Boolean( control.altNotice ) } )
-			) );
+			container.empty().append(
+				control.notificationsTemplate( { notifications: notifications, altNotice: Boolean( control.altNotice ) } ).trim()
+			);
 		},
 
 		/**
diff --git a/src/js/_enqueues/wp/customize/nav-menus.js b/src/js/_enqueues/wp/customize/nav-menus.js
index a9033dbd27..8930f15ddf 100644
--- a/src/js/_enqueues/wp/customize/nav-menus.js
+++ b/src/js/_enqueues/wp/customize/nav-menus.js
@@ -218,7 +218,7 @@
 
 			// Clear the search results and trigger an `input` event to fire a new search.
 			this.$clearResults.on( 'click', function() {
-				self.$search.val( '' ).focus().trigger( 'input' );
+				self.$search.val( '' ).trigger( 'focus' ).trigger( 'input' );
 			} );
 
 			this.$el.on( 'input', '#custom-menu-item-name.invalid, #custom-menu-item-url.invalid', function() {
@@ -446,7 +446,7 @@
 						self.pages[ name ] = -1;
 						return;
 					} else if ( ( 'post_type:page' === name ) && ( ! availableMenuItemContainers[ name ].hasClass( 'open' ) ) ) {
-						availableMenuItemContainers[ name ].find( '.accordion-section-title > button' ).click();
+						availableMenuItemContainers[ name ].find( '.accordion-section-title > button' ).trigger( 'click' );
 					}
 					typeItems = new api.Menus.AvailableItemCollection( typeItems ); // @todo Why is this collection created and then thrown away?
 					self.collection.add( typeItems.models );
@@ -644,7 +644,7 @@
 				return;
 			}
 
-			if ( '' === $.trim( itemName.val() ) ) {
+			if ( '' === itemName.val().trim() ) {
 				itemName.addClass( 'invalid' );
 				itemName.focus();
 				return;
@@ -716,7 +716,7 @@
 
 			this.$el.find( '.selected' ).removeClass( 'selected' );
 
-			this.$search.focus();
+			this.$search.trigger( 'focus' );
 		},
 
 		// Closes the panel.
@@ -1879,7 +1879,7 @@
 
 			// Ensure that whitespace is trimmed on blur so placeholder can be shown.
 			control.container.find( '.edit-menu-item-title' ).on( 'blur', function() {
-				$( this ).val( $.trim( $( this ).val() ) );
+				$( this ).val( $( this ).val().trim() );
 			} );
 
 			titleEl = control.container.find( '.menu-item-title' );
@@ -1888,7 +1888,8 @@
 				if ( ! item ) {
 					return;
 				}
-				trimmedTitle = $.trim( item.title );
+				item.title = item.title || '';
+				trimmedTitle = item.title.trim();
 
 				titleText = trimmedTitle || item.original_title || api.Menus.data.l10n.untitled;
 
diff --git a/src/js/_enqueues/wp/customize/widgets.js b/src/js/_enqueues/wp/customize/widgets.js
index 8d320c8c86..a33bfe1e78 100644
--- a/src/js/_enqueues/wp/customize/widgets.js
+++ b/src/js/_enqueues/wp/customize/widgets.js
@@ -195,7 +195,7 @@
 
 			// Clear the search results and trigger an `input` event to fire a new search.
 			this.$clearResults.on( 'click', function() {
-				self.$search.val( '' ).focus().trigger( 'input' );
+				self.$search.val( '' ).trigger( 'focus' ).trigger( 'input' );
 			} );
 
 			// Close the panel if the URL in the preview changes.
@@ -365,7 +365,7 @@
 			this.collection.doSearch( '' );
 
 			if ( ! api.settings.browser.mobile ) {
-				this.$search.focus();
+				this.$search.trigger( 'focus' );
 			}
 		},
 
@@ -421,9 +421,9 @@
 				this.select( selected );
 
 				if ( selected ) {
-					selected.focus();
+					selected.trigger( 'focus' );
 				} else {
-					this.$search.focus();
+					this.$search.trigger( 'focus' );
 				}
 
 				return;
@@ -818,7 +818,7 @@
 				if ( event.type === 'keypress' && ( event.which !== 13 && event.which !== 32 ) ) {
 					return;
 				}
-				$( this ).focus();
+				$( this ).trigger( 'focus' );
 
 				if ( $( this ).is( '.move-widget' ) ) {
 					self.toggleWidgetMoveArea();
@@ -839,7 +839,7 @@
 						wp.a11y.speak( l10n.widgetMovedDown );
 					}
 
-					$( this ).focus(); // Re-focus after the container was moved.
+					$( this ).trigger( 'focus' ); // Re-focus after the container was moved.
 				}
 			} );
 
@@ -1103,7 +1103,7 @@
 			if ( input.is( ':radio, :checkbox' ) ) {
 				input.prop( 'checked', state );
 			} else if ( input.is( 'select[multiple]' ) ) {
-				if ( ! $.isArray( state ) ) {
+				if ( ! Array.isArray( state ) ) {
 					state = [];
 				} else {
 					// Make sure all state items are strings since the DOM value is a string.
@@ -2089,7 +2089,7 @@
 				widgetNumber = widget.get( 'multi_number' );
 			}
 
-			controlHtml = $.trim( $( '#widget-tpl-' + widget.get( 'id' ) ).html() );
+			controlHtml = $( '#widget-tpl-' + widget.get( 'id' ) ).html().trim();
 			if ( widget.get( 'is_multi' ) ) {
 				controlHtml = controlHtml.replace( /<[^<>]+>/g, function( m ) {
 					return m.replace( /__i__|%i%/g, widgetNumber );
diff --git a/src/js/_enqueues/wp/dashboard.js b/src/js/_enqueues/wp/dashboard.js
index f2ddad2d45..3354790472 100644
--- a/src/js/_enqueues/wp/dashboard.js
+++ b/src/js/_enqueues/wp/dashboard.js
@@ -12,7 +12,7 @@ window.communityEventsData = window.communityEventsData || {};
  *
  * @since 2.7.0
  */
-jQuery(document).ready( function($) {
+jQuery( function($) {
 	var welcomePanel = $( '#welcome-panel' ),
 		welcomePanelHide = $('#wp_welcome_panel-hide'),
 		updateWelcomePanel;
@@ -328,7 +328,7 @@ jQuery( function( $ ) {
 			 * @return {void}
 			 */
 			$container.on( 'submit', '.community-events-form', function( event ) {
-				var location = $.trim( $( '#community-events-location' ).val() );
+				var location = $( '#community-events-location' ).val().trim();
 
 				event.preventDefault();
 
diff --git a/src/js/_enqueues/wp/editor/base.js b/src/js/_enqueues/wp/editor/base.js
index 5fc41f5998..d5fe958c19 100644
--- a/src/js/_enqueues/wp/editor/base.js
+++ b/src/js/_enqueues/wp/editor/base.js
@@ -1178,7 +1178,7 @@ window.wp = window.wp || {};
 		}
 
 		if ( $ ) {
-			$( document ).ready( init );
+			$( init );
 		} else if ( document.addEventListener ) {
 			document.addEventListener( 'DOMContentLoaded', init, false );
 			window.addEventListener( 'load', init, false );
diff --git a/src/js/_enqueues/wp/heartbeat.js b/src/js/_enqueues/wp/heartbeat.js
index aff58b12a3..4f71c1cab4 100644
--- a/src/js/_enqueues/wp/heartbeat.js
+++ b/src/js/_enqueues/wp/heartbeat.js
@@ -234,7 +234,7 @@
 			window.setInterval( checkUserActivity, 30000 );
 
 			// Start one tick after DOM ready.
-			$document.ready( function() {
+			$( function() {
 				settings.lastTick = time();
 				scheduleNextTick();
 			});
diff --git a/src/js/_enqueues/wp/svg-painter.js b/src/js/_enqueues/wp/svg-painter.js
index 85bc04ac65..a356735446 100644
--- a/src/js/_enqueues/wp/svg-painter.js
+++ b/src/js/_enqueues/wp/svg-painter.js
@@ -12,7 +12,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 		colorscheme = {},
 		elements = [];
 
-	$(document).ready( function() {
+	$( function() {
 		// Detection for browser SVG capability.
 		if ( document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' ) ) {
 			$( document.body ).removeClass( 'no-svg' ).addClass( 'svg' );
diff --git a/src/js/_enqueues/wp/theme-plugin-editor.js b/src/js/_enqueues/wp/theme-plugin-editor.js
index 511d46f164..8871b0432a 100644
--- a/src/js/_enqueues/wp/theme-plugin-editor.js
+++ b/src/js/_enqueues/wp/theme-plugin-editor.js
@@ -328,7 +328,7 @@ wp.themePluginEditor = (function( $ ) {
 		 * @return {void}
 		 */
 		codeEditorSettings.onTabPrevious = function() {
-			$( '#templateside' ).find( ':tabbable' ).last().focus();
+			$( '#templateside' ).find( ':tabbable' ).last().trigger( 'focus' );
 		};
 
 		/**
@@ -339,7 +339,7 @@ wp.themePluginEditor = (function( $ ) {
 		 * @return {void}
 		 */
 		codeEditorSettings.onTabNext = function() {
-			$( '#template' ).find( ':tabbable:not(.CodeMirror-code)' ).first().focus();
+			$( '#template' ).find( ':tabbable:not(.CodeMirror-code)' ).first().trigger( 'focus' );
 		};
 
 		/**
diff --git a/src/js/_enqueues/wp/theme.js b/src/js/_enqueues/wp/theme.js
index 2e0445c5df..f4ea7d57a2 100644
--- a/src/js/_enqueues/wp/theme.js
+++ b/src/js/_enqueues/wp/theme.js
@@ -2061,7 +2061,7 @@ themes.RunInstaller = {
 };
 
 // Ready...
-$( document ).ready(function() {
+$( function() {
 	if ( themes.isInstall ) {
 		themes.RunInstaller.init();
 	} else {
@@ -2089,7 +2089,7 @@ $( document ).ready(function() {
 })( jQuery );
 
 // Align theme browser thickbox.
-jQuery(document).ready( function($) {
+jQuery( function($) {
 	window.tb_position = function() {
 		var tbWindow = $('#TB_window'),
 			width = $(window).width(),
diff --git a/src/js/_enqueues/wp/updates.js b/src/js/_enqueues/wp/updates.js
index f98a48e5d6..1e101f0c59 100644
--- a/src/js/_enqueues/wp/updates.js
+++ b/src/js/_enqueues/wp/updates.js
@@ -1803,7 +1803,7 @@
 		$( 'body' ).removeClass( 'modal-open' );
 
 		if ( wp.updates.$elToReturnFocusToFromCredentialsModal ) {
-			wp.updates.$elToReturnFocusToFromCredentialsModal.focus();
+			wp.updates.$elToReturnFocusToFromCredentialsModal.trigger( 'focus' );
 		}
 	};
 
diff --git a/src/js/_enqueues/wp/widgets/media.js b/src/js/_enqueues/wp/widgets/media.js
index 6f8beda739..dbe007cdb8 100644
--- a/src/js/_enqueues/wp/widgets/media.js
+++ b/src/js/_enqueues/wp/widgets/media.js
@@ -551,13 +551,13 @@ wp.mediaWidgets = ( function( $ ) {
 			// Update the title.
 			control.$el.on( 'input change', '.title', function updateTitle() {
 				control.model.set({
-					title: $.trim( $( this ).val() )
+					title: $( this ).val().trim()
 				});
 			});
 
 			// Update link_url attribute.
 			control.$el.on( 'input change', '.link', function updateLinkUrl() {
-				var linkUrl = $.trim( $( this ).val() ), linkType = 'custom';
+				var linkUrl = $( this ).val().trim(), linkType = 'custom';
 				if ( control.selectedAttachment.get( 'linkUrl' ) === linkUrl || control.selectedAttachment.get( 'link' ) === linkUrl ) {
 					linkType = 'post';
 				} else if ( control.selectedAttachment.get( 'url' ) === linkUrl ) {
diff --git a/src/js/media/views/embed/url.js b/src/js/media/views/embed/url.js
index 21ac1a9203..e593b7bc4f 100644
--- a/src/js/media/views/embed/url.js
+++ b/src/js/media/views/embed/url.js
@@ -57,7 +57,8 @@ EmbedUrl = View.extend(/** @lends wp.media.view.EmbedUrl.prototype */{
 	},
 
 	url: function( event ) {
-		this.model.set( 'url', $.trim( event.target.value ) );
+		var url = event.target.value || '';
+		this.model.set( 'url', url.trim() );
 	}
 });
 
diff --git a/src/js/media/views/modal.js b/src/js/media/views/modal.js
index 7253d5cd4d..42fc7c9f60 100644
--- a/src/js/media/views/modal.js
+++ b/src/js/media/views/modal.js
@@ -133,7 +133,7 @@ Modal = wp.media.View.extend(/** @lends wp.media.view.Modal.prototype */{
 		}
 
 		// Pause current audio/video even after closing the modal.
-		$( '.mejs-pause button' ).click();
+		$( '.mejs-pause button' ).trigger( 'click' );
 
 		// Enable page scrolling.
 		$( 'body' ).removeClass( 'modal-open' );
@@ -155,7 +155,7 @@ Modal = wp.media.View.extend(/** @lends wp.media.view.Modal.prototype */{
 			// Fallback to the admin page main element.
 			$( '#wpbody-content' )
 				.attr( 'tabindex', '-1' )
-				.focus();
+				.trigger( 'focus' );
 		}
 
 		this.propagate('close');
diff --git a/src/js/media/views/uploader/inline.js b/src/js/media/views/uploader/inline.js
index c6bc5fa068..57016aec49 100644
--- a/src/js/media/views/uploader/inline.js
+++ b/src/js/media/views/uploader/inline.js
@@ -134,7 +134,7 @@ UploaderInline = View.extend(/** @lends wp.media.view.UploaderInline.prototype *
 			this.controller.$uploaderToggler
 				.attr( 'aria-expanded', 'false' )
 				// Move focus back to the toggle button when closing the uploader.
-				.focus();
+				.trigger( 'focus' );
 		}
 	}