docs(api): add missing code to javascript demo index files (#3760)

Author: brandyscarney

static/usage/v8/input/mask/javascript/index_ts.md

@@ -19,6 +19,17 @@ import '@ionic/core/css/text-transformation.css';
 import '@ionic/core/css/flex-utils.css';
 import '@ionic/core/css/display.css';
 
+/**
+ * Ionic Dark Palette
+ * -----------------------------------------------------
+ * For more information, please see:
+ * https://ionicframework.com/docs/theming/dark-mode
+ */
+
+// import '@ionic/core/css/palettes/dark.always.css';
+// import '@ionic/core/css/palettes/dark.class.css';
+import '@ionic/core/css/palettes/dark.system.css';
+
 /* Theme variables */
 import './theme/variables.css';
 

static/usage/v8/modal/styling/animations/javascript/index_ts.md

@@ -3,6 +3,36 @@ import { defineCustomElements } from '@ionic/core/loader';
 
 import { createAnimation } from '@ionic/core';
 
+/* Core CSS required for Ionic components to work properly */
+import '@ionic/core/css/core.css';
+
+/* Basic CSS for apps built with Ionic */
+import '@ionic/core/css/normalize.css';
+import '@ionic/core/css/structure.css';
+import '@ionic/core/css/typography.css';
+
+/* Optional CSS utils that can be commented out */
+import '@ionic/core/css/padding.css';
+import '@ionic/core/css/float-elements.css';
+import '@ionic/core/css/text-alignment.css';
+import '@ionic/core/css/text-transformation.css';
+import '@ionic/core/css/flex-utils.css';
+import '@ionic/core/css/display.css';
+
+/**
+ * Ionic Dark Palette
+ * -----------------------------------------------------
+ * For more information, please see:
+ * https://ionicframework.com/docs/theming/dark-mode
+ */
+
+// import '@ionic/core/css/palettes/dark.always.css';
+// import '@ionic/core/css/palettes/dark.class.css';
+import '@ionic/core/css/palettes/dark.system.css';
+
+/* Theme variables */
+import './theme/variables.css';
+
 defineCustomElements();
 
 (window as any).createAnimation = createAnimation;