diff --git a/core/inject.js b/core/inject.js
index 07999f27ee2..6c7094428a9 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -59,7 +59,8 @@ const inject = function(container, opt_options) {
   }
   const options =
       new Options(opt_options || (/** @type {!BlocklyOptions} */ ({})));
-  const subContainer = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+  const subContainer =
+      /** @type {!HTMLDivElement} */ (document.createElement('div'));
   subContainer.className = 'injectionDiv';
   subContainer.tabIndex = 0;
   aria.setState(subContainer, aria.State.LABEL, Msg['WORKSPACE_ARIA_LABEL']);
diff --git a/core/menuitem.js b/core/menuitem.js
index f869b7071af..b4bd2ed301f 100644
--- a/core/menuitem.js
+++ b/core/menuitem.js
@@ -107,7 +107,8 @@ const MenuItem = class {
    * @return {!Element} Completed DOM.
    */
   createDom() {
-    const element = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const element =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     element.id = idGenerator.getNextUniqueId();
     this.element_ = element;
 
@@ -121,11 +122,13 @@ const MenuItem = class {
                            '') +
         (this.rightToLeft_ ? 'blocklyMenuItemRtl goog-menuitem-rtl ' : '');
 
-    const content = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const content =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     content.className = 'blocklyMenuItemContent goog-menuitem-content';
     // Add a checkbox for checkable menu items.
     if (this.checkable_) {
-      const checkbox = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+      const checkbox =
+          /** @type {!HTMLDivElement} */ (document.createElement('div'));
       checkbox.className = 'blocklyMenuItemCheckbox goog-menuitem-checkbox';
       content.appendChild(checkbox);
     }
diff --git a/core/toolbox/category.js b/core/toolbox/category.js
index f174c635ed7..47165b637a9 100644
--- a/core/toolbox/category.js
+++ b/core/toolbox/category.js
@@ -246,7 +246,8 @@ class ToolboxCategory extends ToolboxItem {
    * @protected
    */
   createContainer_() {
-    const container = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const container =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(container, this.cssConfig_['container']);
     return container;
   }
@@ -258,7 +259,8 @@ class ToolboxCategory extends ToolboxItem {
    * @protected
    */
   createRowContainer_() {
-    const rowDiv = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const rowDiv =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(rowDiv, this.cssConfig_['row']);
     let nestedPadding = ToolboxCategory.nestedPadding * this.getLevel();
     nestedPadding = nestedPadding.toString() + 'px';
@@ -274,7 +276,8 @@ class ToolboxCategory extends ToolboxItem {
    * @protected
    */
   createRowContentsContainer_() {
-    const contentsContainer = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const contentsContainer =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(contentsContainer, this.cssConfig_['rowcontentcontainer']);
     return contentsContainer;
   }
diff --git a/core/toolbox/collapsible_category.js b/core/toolbox/collapsible_category.js
index f4e7d55de68..032a3f6c29a 100644
--- a/core/toolbox/collapsible_category.js
+++ b/core/toolbox/collapsible_category.js
@@ -174,7 +174,8 @@ class CollapsibleToolboxCategory extends ToolboxCategory {
    * @protected
    */
   createSubCategoriesDom_(subcategories) {
-    const contentsContainer = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const contentsContainer =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(contentsContainer, this.cssConfig_['contents']);
 
     for (let i = 0; i < subcategories.length; i++) {
diff --git a/core/toolbox/separator.js b/core/toolbox/separator.js
index f61d97b1375..9759286d1d1 100644
--- a/core/toolbox/separator.js
+++ b/core/toolbox/separator.js
@@ -70,7 +70,8 @@ class ToolboxSeparator extends ToolboxItem {
    * @protected
    */
   createDom_() {
-    const container = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const container =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(container, this.cssConfig_['container']);
     this.htmlDiv_ = container;
     return container;
diff --git a/core/toolbox/toolbox.js b/core/toolbox/toolbox.js
index afc95885728..01181e82f8e 100644
--- a/core/toolbox/toolbox.js
+++ b/core/toolbox/toolbox.js
@@ -266,7 +266,8 @@ class Toolbox extends DeleteArea {
    * @protected
    */
   createContainer_() {
-    const toolboxContainer = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const toolboxContainer =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     toolboxContainer.setAttribute('layout', this.isHorizontal() ? 'h' : 'v');
     dom.addClass(toolboxContainer, 'blocklyToolboxDiv');
     dom.addClass(toolboxContainer, 'blocklyNonSelectable');
@@ -280,7 +281,8 @@ class Toolbox extends DeleteArea {
    * @protected
    */
   createContentsContainer_() {
-    const contentsContainer = /** @type {!HTMLDivElement} */ (document.createElement('div'));
+    const contentsContainer =
+        /** @type {!HTMLDivElement} */ (document.createElement('div'));
     dom.addClass(contentsContainer, 'blocklyToolboxContents');
     if (this.isHorizontal()) {
       contentsContainer.style.flexDirection = 'row';