modules/javafx.web/src/main/java/javafx/scene/web/HTMLEditorSkin.java

@@ -304,11 +304,13 @@
                     */
                     if (getCommandState(BULLETS.getCommand()) || getCommandState(NUMBERS.getCommand())) {
                         executeCommand(INDENT.getCommand(), null);
                     }
                     else {
+                        setDesignMode("on");
                         executeCommand(INSERT_TAB.getCommand(), null);
+                        setDesignMode("off");
                     }
                 }
                 else {
                     /*
                     ** if we are in either Bullet or Numbers mode then the

@@ -446,11 +448,10 @@
 
             double totalWork = webView.getEngine().getLoadWorker().getTotalWork();
             if (newValue.doubleValue() == totalWork) {
                 cachedHTMLText = null;
                 Platform.runLater(() -> {
-                    setDesignMode("on");
                     setContentEditable(true);
                     updateToolbarState(true);
                     updateNodeOrientation();
                     executeCommand(STYLEWITHCSS.getCommand(), "true");
                 });