fix(all): accesibility and global styles for hidden nodes

core/src/components/app/app.scss

@@ -26,13 +26,11 @@ ion-app,
   justify-content: space-between;
 }
 
-.hide-page {
+.ion-page-invisible {
   opacity: 0;
 }
 
-[hidden] {
-  // TODO can we remove important here or remove this entirely
-  // since it is also in structure.scss
+.ion-page-hidden {
   /* stylelint-disable-next-line declaration-no-important */
   display: none !important;
 }

core/src/components/content/content.scss

@@ -6,11 +6,11 @@
 :host {
   --ion-color-base: #{$background-color};
   --ion-color-contrast: #{$text-color};
-  --padding-top: 0;
-  --padding-bottom: 0;
-  --padding-start: 0;
-  --padding-end: 0;
-  --keyboard-offset: 0;
+  --padding-top: 0px;
+  --padding-bottom: 0px;
+  --padding-start: 0px;
+  --padding-end: 0px;
+  --keyboard-offset: 0px;
 
   display: block;
   position: relative;

core/src/components/menu-toggle/menu-toggle.scss

@@ -0,0 +1,4 @@
+:host(.menu-toggle-hidden) {
+  /* stylelint-disable-next-line declaration-no-important */
+  display: none;
+}

core/src/components/menu-toggle/menu-toggle.tsx

@@ -2,6 +2,8 @@ import { Component, Listen, Prop, State } from '@stencil/core';
 
 @Component({
   tag: 'ion-menu-toggle',
+  styleUrl: 'menu-toggle.scss',
+  shadow: true
 })
 export class MenuToggle {
   @Prop({ context: 'document' })
@@ -54,9 +56,16 @@ export class MenuToggle {
   hostData() {
     const hidden = this.autoHide && !this.visible;
     return {
-      'hidden': hidden
+      'aria-hidden': hidden ? 'true' : null,
+      class: {
+        'menu-toggle-hidden': hidden,
+      }
     };
   }
+
+  render() {
+    return <slot></slot>;
+  }
 }
 
 function getMenuController(doc: Document): Promise<HTMLIonMenuControllerElement|undefined> {

core/src/components/nav/nav.tsx

@@ -2,7 +2,7 @@ import { Build, Component, Element, Event, EventEmitter, Method, Prop, QueueApi,
 import { ViewLifecycle } from '../..';
 import { Animation, ComponentProps, Config, FrameworkDelegate, GestureDetail, Mode, NavComponent, NavOptions, NavOutlet, NavResult, RouteID, RouteWrite, TransitionDoneFn, TransitionInstruction, ViewController } from '../../interface';
 import { assert } from '../../utils/helpers';
-import { TransitionOptions, lifecycle, transition } from '../../utils/transition';
+import { TransitionOptions, lifecycle, setPageHidden, transition } from '../../utils/transition';
 import { ViewState, convertToViews, matches } from './view-controller';
 
 @Component({
@@ -850,15 +850,16 @@ export class Nav implements NavOutlet {
 
     for (let i = views.length - 1; i >= 0; i--) {
       const view = views[i];
+      const element = view.element;
       if (i > activeViewIndex) {
         // this view comes after the active view
         // let's unload it
-        lifecycle(this.win, view.element, ViewLifecycle.WillUnload);
+        lifecycle(this.win, element, ViewLifecycle.WillUnload);
         this.destroyView(view);
       } else if (i < activeViewIndex) {
         // this view comes before the active view
         // and it is not a portal then ensure it is hidden
-        view.element!.hidden = true;
+        setPageHidden(element!, true);
       }
     }
   }

core/src/components/nav/view-controller.ts

@@ -29,7 +29,7 @@ export class ViewController {
 
     if (!this.element) {
       const component = this.component;
-      this.element = await attachComponent(this.delegate, container, component, ['ion-page', 'hide-page'], this.params);
+      this.element = await attachComponent(this.delegate, container, component, ['ion-page', 'ion-page-invisible'], this.params);
     }
   }
 

core/src/components/router-outlet/route-outlet.tsx

@@ -55,7 +55,7 @@ export class RouterOutlet implements NavOutlet {
     this.activeComponent = component;
 
     // attach entering view to DOM
-    const enteringEl = await attachComponent(this.delegate, this.el, component, ['ion-page', 'hide-page'], params);
+    const enteringEl = await attachComponent(this.delegate, this.el, component, ['ion-page', 'ion-page-invisible'], params);
     const leavingEl = this.activeEl;
 
     // commit animation

core/src/components/tab-button/tab-button.scss

@@ -36,7 +36,8 @@
 }
 
 :host(.tab-hidden) {
-  display: none;
+  /* stylelint-disable-next-line declaration-no-important */
+  display: none !important;
 }
 
 a {

core/src/components/tab/tab.scss

@@ -0,0 +1,4 @@
+:host(.tab-hidden) {
+  /* stylelint-disable-next-line declaration-no-important */
+  display: none !important;
+}

core/src/components/tab/tab.tsx

@@ -3,7 +3,9 @@ import { Color, ComponentRef, FrameworkDelegate } from '../../interface';
 import { attachComponent } from '../../utils/framework-delegate';
 
 @Component({
-  tag: 'ion-tab'
+  tag: 'ion-tab',
+  styleUrl: 'tab.scss',
+  shadow: true
 })
 export class Tab {
 
@@ -136,13 +138,19 @@ export class Tab {
   }
 
   hostData() {
+    const { btnId, active, component } = this;
     return {
-      'aria-labelledby': this.btnId,
+      'aria-labelledby': btnId,
+      'aria-hidden': !active ? 'true' : null,
       'role': 'tabpanel',
-      'hidden': !this.active,
       'class': {
-        'ion-page': !this.component
+        'ion-page': !component,
+        'tab-hidden': !active
       }
     };
   }
+
+  render() {
+    return <slot></slot>;
+  }
 }

core/src/components/tabbar/tabbar.scss

@@ -24,7 +24,8 @@
 }
 
 :host(.tabbar-hidden) {
-  display: none;
+  /* stylelint-disable-next-line declaration-no-important */
+  display: none !important;
 }
 
 :host(.placement-top) {

core/src/components/tabbar/tabbar.tsx

@@ -24,7 +24,7 @@ export class Tabbar {
 
   @State() canScrollLeft = false;
   @State() canScrollRight = false;
-  @State() hidden = false;
+  @State() keyboardVisible = false;
 
   /**
    * Set the layout of the text and icon in the tabbar. Available options: `"icon-top"`, `"icon-start"`, `"icon-end"`, `"icon-bottom"`, `"icon-hide"`, `"label-hide"`.
@@ -68,13 +68,13 @@ export class Tabbar {
 
   @Listen('body:keyboardWillHide')
   protected onKeyboardWillHide() {
-    setTimeout(() => this.hidden = false, 50);
+    setTimeout(() => this.keyboardVisible = false, 50);
   }
 
   @Listen('body:keyboardWillShow')
   protected onKeyboardWillShow() {
     if (this.placement === 'bottom') {
-      this.hidden = true;
+      this.keyboardVisible = true;
     }
   }
 
@@ -182,15 +182,17 @@ export class Tabbar {
   }
 
   hostData() {
+    const { color, translucent, layout, placement, keyboardVisible, scrollable } = this;
     return {
       role: 'tablist',
+      'aria-hidden': keyboardVisible ? 'true' : null,
       class: {
-        ...createColorClasses(this.color),
-        'tabbar-translucent': this.translucent,
-        [`layout-${this.layout}`]: true,
-        [`placement-${this.placement}`]: true,
-        'tabbar-hidden': this.hidden,
-        'scrollable': this.scrollable
+        ...createColorClasses(color),
+        'tabbar-translucent': translucent,
+        [`layout-${layout}`]: true,
+        [`placement-${placement}`]: true,
+        'tabbar-hidden': keyboardVisible,
+        'scrollable': scrollable
       }
     };
   }
@@ -209,6 +211,7 @@ export class Tabbar {
       selected={selectedTab === tab}
       mode={this.mode}
       color={this.color}
+      aria-hidden={ !tab.show ? 'true' : null }
       class={{ 'tab-hidden': !tab.show }}
       onClick={(ev) => {
         if (!tab.disabled) {