From f727b9295fc1eed81a8a1cda2feadf024183c3b8 Mon Sep 17 00:00:00 2001
From: Emmanuel Pelletier <manu@habite.la>
Date: Mon, 6 Mar 2023 16:13:29 +0100
Subject: [PATCH] Use tabs ARIA design pattern when using tabbed UI (#12994)

feat(a11y): use tabs ARIA design pattern when using tabbed UI
---
 css/_meetings_list.scss                       |  15 +-
 css/_polls.scss                               |   2 +-
 css/_welcome_page.scss                        |   6 +-
 lang/main.json                                |   5 +-
 .../base/react/components/web/MeetingsList.js |  36 +++--
 .../ui/components/web/ContextMenuItem.tsx     |  25 +++-
 .../base/ui/components/web/Dialog.tsx         |   2 +-
 .../base/ui/components/web/DialogWithTabs.tsx | 128 ++++++++++++++---
 .../features/base/ui/components/web/Tabs.tsx  |  41 +++++-
 .../components/CalendarList.web.js            |   3 +-
 react/features/chat/components/web/Chat.js    |  41 +++---
 .../chat/components/web/ChatInput.tsx         |   1 -
 .../components/DesktopPicker.tsx              |  38 +++--
 .../polls/components/web/PollsPane.tsx        |   1 -
 react/features/welcome/components/Tab.js      |  76 ----------
 react/features/welcome/components/Tabs.js     | 133 +++++++++++-------
 .../welcome/components/WelcomePage.web.js     |  24 +---
 17 files changed, 338 insertions(+), 239 deletions(-)
 delete mode 100644 react/features/welcome/components/Tab.js

diff --git a/css/_meetings_list.scss b/css/_meetings_list.scss
index ecbc76f7f..563e04bbf 100644
--- a/css/_meetings_list.scss
+++ b/css/_meetings_list.scss
@@ -82,6 +82,7 @@
         }
 
         .left-column {
+            order: -1;
             display: flex;
             flex-direction: column;
             flex-grow: 0;
@@ -92,6 +93,7 @@
         .right-column {
             display: flex;
             flex-direction: column;
+            align-items: flex-start;
             flex-grow: 1;
             padding-left: 16px;
             padding-top: 13px;
@@ -99,11 +101,11 @@
         }
 
         .title {
-                font-size: 12px;
-                font-weight: 600;
-                line-height: 16px;
-                padding-bottom: 4px;
-            }
+            font-size: 12px;
+            font-weight: 600;
+            line-height: 16px;
+            margin-bottom: 4px;
+        }
 
         .subtitle {
             color: #5E6D7A;
@@ -125,8 +127,7 @@
             cursor: pointer;
         }
 
-        &.with-click-handler:hover,
-        &.with-click-handler:focus {
+        &.with-click-handler:hover {
             background-color: #c7ddff;
         }
 
diff --git a/css/_polls.scss b/css/_polls.scss
index 1ee433269..966f7452e 100644
--- a/css/_polls.scss
+++ b/css/_polls.scss
@@ -1,3 +1,3 @@
-#polls-panel {
+.polls-panel {
     height: calc(100% - 119px);
 }
diff --git a/css/_welcome_page.scss b/css/_welcome_page.scss
index ebdae67f8..59344150d 100644
--- a/css/_welcome_page.scss
+++ b/css/_welcome_page.scss
@@ -167,7 +167,7 @@ body.welcome-page {
             margin: 4px;
             display: $welcomePageTabButtonsDisplay;
 
-            .tab {
+            [role="tab"] {
                 background-color: #c7ddff;
                 border-radius: 7px;
                 cursor: pointer;
@@ -176,8 +176,10 @@ body.welcome-page {
                 margin: 2px;
                 padding: 7px 0;
                 text-align: center;
+                color: inherit;
+                border: 0;
 
-                &.selected {
+                &[aria-selected="true"] {
                     background-color: #FFF;
                 }
             }
diff --git a/lang/main.json b/lang/main.json
index f9e3e520d..cb721a35b 100644
--- a/lang/main.json
+++ b/lang/main.json
@@ -240,7 +240,9 @@
         "WaitingForHostTitle": "Waiting for the host ...",
         "Yes": "Yes",
         "accessibilityLabel": {
-            "liveStreaming": "Live Stream"
+            "close": "Close dialog",
+            "liveStreaming": "Live Stream",
+            "sharingTabs": "Sharing options"
         },
         "add": "Add",
         "addMeetingNote": "Add a note about this meeting",
@@ -1387,6 +1389,7 @@
             "microsoftLogo": "Microsoft logo",
             "policyLogo": "Policy logo"
         },
+        "meetingsAccessibilityLabel": "Meetings",
         "mobileDownLoadLinkAndroid": "Download mobile app for Android",
         "mobileDownLoadLinkFDroid": "Download mobile app for F-Droid",
         "mobileDownLoadLinkIos": "Download mobile app for iOS",
diff --git a/react/features/base/react/components/web/MeetingsList.js b/react/features/base/react/components/web/MeetingsList.js
index 242784e0f..f9b8f7d1b 100644
--- a/react/features/base/react/components/web/MeetingsList.js
+++ b/react/features/base/react/components/web/MeetingsList.js
@@ -105,17 +105,14 @@ class MeetingsList extends Component<Props> {
      * @returns {React.ReactNode}
      */
     render() {
-        const { listEmptyComponent, meetings, t } = this.props;
+        const { listEmptyComponent, meetings } = this.props;
 
         /**
          * If there are no recent meetings we don't want to display anything.
          */
         if (meetings) {
             return (
-                <Container
-                    aria-label = { t('welcomepage.recentList') }
-                    className = 'meetings-list'
-                    tabIndex = '-1'>
+                <Container className = 'meetings-list'>
                     {
                         meetings.length === 0
                             ? listEmptyComponent
@@ -237,23 +234,16 @@ class MeetingsList extends Component<Props> {
 
         return (
             <Container
-                aria-label = { title }
                 className = { rootClassName }
                 key = { index }
-                onClick = { onPress }
-                onKeyPress = { onKeyPress }
-                role = 'button'
-                tabIndex = { 0 }>
-                <Container className = 'left-column'>
-                    <Text className = 'title'>
-                        { _toDateString(date) }
-                    </Text>
-                    <Text className = 'subtitle'>
-                        { _toTimeString(time) }
-                    </Text>
-                </Container>
+                onClick = { onPress }>
                 <Container className = 'right-column'>
-                    <Text className = 'title'>
+                    <Text
+                        className = 'title'
+                        onClick = { onPress }
+                        onKeyPress = { onKeyPress }
+                        role = 'button'
+                        tabIndex = { 0 }>
                         { title }
                     </Text>
                     {
@@ -269,6 +259,14 @@ class MeetingsList extends Component<Props> {
                             </Text>) : null
                     }
                 </Container>
+                <Container className = 'left-column'>
+                    <Text className = 'title'>
+                        { _toDateString(date) }
+                    </Text>
+                    <Text className = 'subtitle'>
+                        { _toTimeString(time) }
+                    </Text>
+                </Container>
                 <Container className = 'actions'>
                     { elementAfter || null }
 
diff --git a/react/features/base/ui/components/web/ContextMenuItem.tsx b/react/features/base/ui/components/web/ContextMenuItem.tsx
index 3731dc38d..6dfe873b2 100644
--- a/react/features/base/ui/components/web/ContextMenuItem.tsx
+++ b/react/features/base/ui/components/web/ContextMenuItem.tsx
@@ -26,6 +26,13 @@ export interface IProps {
      */
     className?: string;
 
+    /**
+     * Id of dom element controlled by this item. Matches aria-controls.
+     * Useful if you need this item as a tab element.
+     *
+     */
+    controls?: string;
+
     /**
      * Custom icon. If used, the icon prop is ignored.
      * Used to allow custom children instead of just the default icons.
@@ -55,7 +62,7 @@ export interface IProps {
     /**
      * Keydown handler.
      */
-    onKeyDown?: (e?: React.KeyboardEvent) => void;
+    onKeyDown?: (e: React.KeyboardEvent<HTMLDivElement>) => void;
 
     /**
      * Keypress handler.
@@ -67,6 +74,11 @@ export interface IProps {
      */
     overflowType?: TEXT_OVERFLOW_TYPES;
 
+    /**
+     * You can use this item as a tab. Defaults to button if not set.
+     */
+    role?: 'tab' | 'button';
+
     /**
      * Whether the item is marked as selected.
      */
@@ -150,6 +162,7 @@ const ContextMenuItem = ({
     accessibilityLabel,
     children,
     className,
+    controls,
     customIcon,
     disabled,
     id,
@@ -158,6 +171,7 @@ const ContextMenuItem = ({
     onKeyDown,
     onKeyPress,
     overflowType,
+    role = 'button',
     selected,
     testId,
     text,
@@ -167,8 +181,10 @@ const ContextMenuItem = ({
 
     return (
         <div
+            aria-controls = { controls }
             aria-disabled = { disabled }
             aria-label = { accessibilityLabel }
+            aria-selected = { role === 'tab' ? selected : undefined }
             className = { cx(styles.contextMenuItem,
                     _overflowDrawer && styles.contextMenuItemDrawer,
                     disabled && styles.contextMenuItemDisabled,
@@ -181,8 +197,11 @@ const ContextMenuItem = ({
             onClick = { disabled ? undefined : onClick }
             onKeyDown = { disabled ? undefined : onKeyDown }
             onKeyPress = { disabled ? undefined : onKeyPress }
-            role = 'button'
-            tabIndex = { disabled ? undefined : 0 }>
+            role = { role }
+            tabIndex = { role === 'tab'
+                ? selected ? 0 : -1
+                : disabled ? undefined : 0
+            }>
             {customIcon ? customIcon
                 : icon && <Icon
                     className = { styles.contextMenuItemIcon }
diff --git a/react/features/base/ui/components/web/Dialog.tsx b/react/features/base/ui/components/web/Dialog.tsx
index 69ac9d55c..ee01c18ac 100644
--- a/react/features/base/ui/components/web/Dialog.tsx
+++ b/react/features/base/ui/components/web/Dialog.tsx
@@ -131,7 +131,7 @@ const Dialog = ({
                 </p>
                 {!hideCloseButton && (
                     <ClickableIcon
-                        accessibilityLabel = { t('dialog.close') }
+                        accessibilityLabel = { t('dialog.accessibilityLabel.close') }
                         icon = { IconCloseLarge }
                         id = 'modal-header-close-button'
                         onClick = { onClose } />
diff --git a/react/features/base/ui/components/web/DialogWithTabs.tsx b/react/features/base/ui/components/web/DialogWithTabs.tsx
index 3f3e12be0..1f5042585 100644
--- a/react/features/base/ui/components/web/DialogWithTabs.tsx
+++ b/react/features/base/ui/components/web/DialogWithTabs.tsx
@@ -1,4 +1,5 @@
 import React, { ComponentType, useCallback, useEffect, useMemo, useState } from 'react';
+import { MoveFocusInside } from 'react-focus-lock';
 import { useTranslation } from 'react-i18next';
 import { useDispatch, useSelector } from 'react-redux';
 import { makeStyles } from 'tss-react/mui';
@@ -89,10 +90,6 @@ const useStyles = makeStyles()(theme => {
             }
         },
 
-        closeButtonContainer: {
-            paddingBottom: theme.spacing(4)
-        },
-
         buttonContainer: {
             width: '100%',
             boxSizing: 'border-box',
@@ -109,6 +106,7 @@ const useStyles = makeStyles()(theme => {
 
         backContainer: {
             display: 'flex',
+            flexDirection: 'row-reverse',
             alignItems: 'center',
 
             '& > button': {
@@ -127,6 +125,11 @@ const useStyles = makeStyles()(theme => {
             }
         },
 
+        header: {
+            order: -1,
+            paddingBottom: theme.spacing(4)
+        },
+
         footer: {
             justifyContent: 'flex-end',
             paddingTop: theme.spacing(4),
@@ -168,6 +171,7 @@ const DialogWithTabs = ({
     const dispatch = useDispatch();
     const { t } = useTranslation();
     const [ selectedTab, setSelectedTab ] = useState<string | undefined>(defaultTab ?? tabs[0].name);
+    const [ userSelected, setUserSelected ] = useState(false);
     const [ tabStates, setTabStates ] = useState(tabs.map(tab => tab.props));
     const clientWidth = useSelector((state: IReduxState) => state['features/base/responsive-ui'].clientWidth);
     const [ isMobile, setIsMobile ] = useState(false);
@@ -188,18 +192,58 @@ const DialogWithTabs = ({
         }
     }, [ isMobile ]);
 
-    const back = useCallback(() => {
-        setSelectedTab(undefined);
+    const onUserSelection = useCallback((tabName?: string) => {
+        setUserSelected(true);
+        setSelectedTab(tabName);
     }, []);
 
+    const back = useCallback(() => {
+        onUserSelection(undefined);
+    }, []);
+
+
+    // the userSelected state is used to prevent setting focus when the user
+    // didn't actually interact (for the first rendering for example)
+    useEffect(() => {
+        if (userSelected) {
+            document.querySelector<HTMLElement>(isMobile
+                ? `.${classes.title}`
+                : `#${`dialogtab-button-${selectedTab}`}`
+            )?.focus();
+            setUserSelected(false);
+        }
+    }, [ isMobile, userSelected, selectedTab ]);
+
     const onClose = useCallback(() => {
         dispatch(hideDialog());
     }, []);
 
     const onClick = useCallback((tabName: string) => () => {
-        setSelectedTab(tabName);
+        onUserSelection(tabName);
     }, []);
 
+    const onTabKeyDown = useCallback((index: number) => (event: React.KeyboardEvent<HTMLDivElement>) => {
+        let newTab: IDialogTab<any> | null = null;
+
+        if (event.key === 'ArrowUp') {
+            newTab = index === 0 ? tabs[tabs.length - 1] : tabs[index - 1];
+        }
+
+        if (event.key === 'ArrowDown') {
+            newTab = index === tabs.length - 1 ? tabs[0] : tabs[index + 1];
+        }
+
+        if (newTab !== null) {
+            onUserSelection(newTab.name);
+        }
+    }, [ tabs.length ]);
+
+    const onMobileKeyDown = useCallback((tabName: string) => (event: React.KeyboardEvent<HTMLDivElement>) => {
+        if (event.key === ' ' || event.key === 'Enter') {
+            onUserSelection(tabName);
+        }
+    }, [ classes.contentContainer ]);
+
     const getTabProps = (tabId: number) => {
         const tabConfiguration = tabs[tabId];
         const currentTabState = tabStates[tabId];
@@ -256,7 +300,7 @@ const DialogWithTabs = ({
 
     const closeIcon = useMemo(() => (
         <ClickableIcon
-            accessibilityLabel = { t('dialog.close') }
+            accessibilityLabel = { t('dialog.accessibilityLabel.close') }
             icon = { IconCloseLarge }
             id = 'modal-header-close-button'
             onClick = { onClose } />
@@ -268,21 +312,39 @@ const DialogWithTabs = ({
             onClose = { onClose }
             size = 'large'>
             {(!isMobile || !selectedTab) && (
-                <div className = { classes.sidebar }>
+                <div
+                    aria-orientation = 'vertical'
+                    className = { classes.sidebar }
+                    role = { isMobile ? undefined : 'tablist' }>
                     <div className = { classes.titleContainer }>
-                        <h2 className = { classes.title }>{t(titleKey ?? '')}</h2>
+                        <MoveFocusInside>
+                            <h2
+                                className = { classes.title }
+                                tabIndex = { -1 }>
+                                {t(titleKey ?? '')}
+                            </h2>
+                        </MoveFocusInside>
                         {isMobile && closeIcon}
                     </div>
-                    {tabs.map(tab => {
+                    {tabs.map((tab, index) => {
                         const label = t(tab.labelKey);
 
+                        /**
+                         * When not on mobile, the items behave as tabs,
+                         * that's why we set `controls`, `role` and `selected` attributes
+                         * only when not on mobile, they are useful only for the tab behavior.
+                         */
                         return (
                             <ContextMenuItem
                                 accessibilityLabel = { label }
                                 className = { cx(isMobile && classes.menuItemMobile) }
+                                controls = { isMobile ? undefined : `dialogtab-content-${tab.name}` }
                                 icon = { tab.icon }
+                                id = { `dialogtab-button-${tab.name}` }
                                 key = { tab.name }
                                 onClick = { onClick(tab.name) }
+                                onKeyDown = { isMobile ? onMobileKeyDown(tab.name) : onTabKeyDown(index) }
+                                role = { isMobile ? undefined : 'tab' }
                                 selected = { tab.name === selectedTab }
                                 text = { label } />
                         );
@@ -290,25 +352,45 @@ const DialogWithTabs = ({
                 </div>
             )}
             {(!isMobile || selectedTab) && (
-                <div className = { classes.contentContainer }>
-                    <div className = { cx(classes.buttonContainer, classes.closeButtonContainer) }>
-                        {isMobile && (
+                <div
+                    className = { classes.contentContainer }
+                    tabIndex = { isMobile ? -1 : undefined }>
+                    {/* DOM order is important for keyboard users: show whole heading first when on mobile… */}
+                    {isMobile && (
+                        <div className = { cx(classes.buttonContainer, classes.header) }>
                             <span className = { classes.backContainer }>
+                                <h2
+                                    className = { classes.title }
+                                    tabIndex = { -1 }>
+                                    {(selectedTabIndex !== null) && t(tabs[selectedTabIndex].labelKey)}
+                                </h2>
                                 <ClickableIcon
                                     accessibilityLabel = { t('dialog.Back') }
                                     icon = { IconArrowBack }
                                     id = 'modal-header-back-button'
                                     onClick = { back } />
-                                <h2 className = { classes.title }>
-                                    {(selectedTabIndex !== null) && t(tabs[selectedTabIndex].labelKey)}
-                                </h2>
                             </span>
-                        )}
-                        {closeIcon}
-                    </div>
-                    <div className = { classes.content }>
-                        {selectedTabComponent}
-                    </div>
+                            {closeIcon}
+                        </div>
+                    )}
+                    {tabs.map(tab => (
+                        <div
+                            aria-labelledby = { isMobile ? undefined : `${tab.name}-button` }
+                            className = { cx(classes.content, tab.name !== selectedTab && 'hide') }
+                            id = { `dialogtab-content-${tab.name}` }
+                            key = { tab.name }
+                            role = { isMobile ? undefined : 'tabpanel' }
+                            tabIndex = { isMobile ? -1 : 0 }>
+                            { tab.name === selectedTab && selectedTabComponent }
+                        </div>
+                    ))}
+                    {/* But show the close button *after* tab panels when not on mobile (using tabs).
+                    This is so that we can tab back and forth tab buttons and tab panels easily. */}
+                    {!isMobile && (
+                        <div className = { cx(classes.buttonContainer, classes.header) }>
+                            {closeIcon}
+                        </div>
+                    )}
                     <div
                         className = { cx(classes.buttonContainer, classes.footer) }>
                         <Button
diff --git a/react/features/base/ui/components/web/Tabs.tsx b/react/features/base/ui/components/web/Tabs.tsx
index e198d5cda..323168c22 100644
--- a/react/features/base/ui/components/web/Tabs.tsx
+++ b/react/features/base/ui/components/web/Tabs.tsx
@@ -1,4 +1,4 @@
-import React, { useCallback } from 'react';
+import React, { useCallback, useEffect } from 'react';
 import { makeStyles } from 'tss-react/mui';
 
 import { isMobileBrowser } from '../../../environment/utils';
@@ -11,6 +11,7 @@ interface ITabProps {
     selected: string;
     tabs: Array<{
         accessibilityLabel: string;
+        controlsId: string;
         countBadge?: number;
         disabled?: boolean;
         id: string;
@@ -87,26 +88,52 @@ const Tabs = ({
 }: ITabProps) => {
     const { classes, cx } = useStyles();
     const isMobile = isMobileBrowser();
-
-    const handleChange = useCallback((e: React.MouseEvent<HTMLButtonElement>) => {
-        onChange(e.currentTarget.id);
+    const onClick = useCallback(id => () => {
+        onChange(id);
     }, []);
+    const onKeyDown = useCallback((index: number) => (event: React.KeyboardEvent<HTMLButtonElement>) => {
+        let newIndex: number | null = null;
+
+        if (event.key === 'ArrowLeft') {
+            event.preventDefault();
+            newIndex = index === 0 ? tabs.length - 1 : index - 1;
+        }
+
+        if (event.key === 'ArrowRight') {
+            event.preventDefault();
+            newIndex = index === tabs.length - 1 ? 0 : index + 1;
+        }
+
+        if (newIndex !== null) {
+            onChange(tabs[newIndex].id);
+        }
+    }, [ tabs ]);
+
+    useEffect(() => {
+        // this test is needed to make sure the effect is triggered because of user actually changing tab
+        if (document.activeElement?.getAttribute('role') === 'tab') {
+            document.querySelector<HTMLButtonElement>(`#${selected}`)?.focus();
+        }
+    }, [ selected ]);
 
     return (
         <div
             aria-label = { accessibilityLabel }
             className = { cx(classes.container, className) }
             role = 'tablist'>
-            {tabs.map(tab => (
+            {tabs.map((tab, index) => (
                 <button
+                    aria-controls = { tab.controlsId }
                     aria-label = { tab.accessibilityLabel }
                     aria-selected = { selected === tab.id }
                     className = { cx(classes.tab, selected === tab.id && 'selected', isMobile && 'is-mobile') }
                     disabled = { tab.disabled }
                     id = { tab.id }
                     key = { tab.id }
-                    onClick = { handleChange }
-                    role = 'tab'>
+                    onClick = { onClick(tab.id) }
+                    onKeyDown = { onKeyDown(index) }
+                    role = 'tab'
+                    tabIndex = { selected === tab.id ? undefined : -1 }>
                     {tab.label}
                     {tab.countBadge && <span className = { classes.badge }>{tab.countBadge}</span>}
                 </button>
diff --git a/react/features/calendar-sync/components/CalendarList.web.js b/react/features/calendar-sync/components/CalendarList.web.js
index 14cbcb198..9a293c84d 100644
--- a/react/features/calendar-sync/components/CalendarList.web.js
+++ b/react/features/calendar-sync/components/CalendarList.web.js
@@ -202,7 +202,8 @@ class CalendarList extends AbstractPage<Props> {
                     className = 'meetings-list-empty-button'
                     onClick = { this._onOpenSettings }
                     onKeyPress = { this._onKeyPressOpenSettings }
-                    role = 'button'>
+                    role = 'button'
+                    tabIndex = { 0 }>
                     <Icon
                         className = 'meetings-list-empty-icon'
                         src = { IconCalendar } />
diff --git a/react/features/chat/components/web/Chat.js b/react/features/chat/components/web/Chat.js
index aab8f3365..486e8e227 100644
--- a/react/features/chat/components/web/Chat.js
+++ b/react/features/chat/components/web/Chat.js
@@ -134,35 +134,38 @@ class Chat extends AbstractChat<Props> {
     _renderChat() {
         const { _isPollsEnabled, _isPollsTabFocused } = this.props;
 
-        if (_isPollsTabFocused) {
-            return (
-                <>
-                    { _isPollsEnabled && this._renderTabs() }
-                    <div
-                        aria-labelledby = { CHAT_TABS.POLLS }
-                        id = 'polls-panel'
-                        role = 'tabpanel'>
-                        <PollsPane />
-                    </div>
-                    <KeyboardAvoider />
-                </>
-            );
-        }
-
         return (
             <>
                 { _isPollsEnabled && this._renderTabs() }
                 <div
                     aria-labelledby = { CHAT_TABS.CHAT }
-                    className = { clsx('chat-panel', !_isPollsEnabled && 'chat-panel-no-tabs') }
-                    id = 'chat-panel'
-                    role = 'tabpanel'>
+                    className = { clsx(
+                        'chat-panel',
+                        !_isPollsEnabled && 'chat-panel-no-tabs',
+                        _isPollsTabFocused && 'hide'
+                    ) }
+                    id = { `${CHAT_TABS.CHAT}-panel` }
+                    role = 'tabpanel'
+                    tabIndex = { 0 }>
                     <MessageContainer
                         messages = { this.props._messages } />
                     <MessageRecipient />
                     <ChatInput
                         onSend = { this._onSendMessage } />
                 </div>
+                { _isPollsEnabled && (
+                    <>
+                        <div
+                            aria-labelledby = { CHAT_TABS.POLLS }
+                            className = { clsx('polls-panel', !_isPollsTabFocused && 'hide') }
+                            id = { `${CHAT_TABS.POLLS}-panel` }
+                            role = 'tabpanel'
+                            tabIndex = { 0 }>
+                            <PollsPane />
+                        </div>
+                        <KeyboardAvoider />
+                    </>
+                )}
             </>
         );
     }
@@ -185,11 +188,13 @@ class Chat extends AbstractChat<Props> {
                     accessibilityLabel: t('chat.tabs.chat'),
                     countBadge: _isPollsTabFocused && _nbUnreadMessages > 0 ? _nbUnreadMessages : undefined,
                     id: CHAT_TABS.CHAT,
+                    controlsId: `${CHAT_TABS.CHAT}-panel`,
                     label: t('chat.tabs.chat')
                 }, {
                     accessibilityLabel: t('chat.tabs.polls'),
                     countBadge: !_isPollsTabFocused && _nbUnreadPolls > 0 ? _nbUnreadPolls : undefined,
                     id: CHAT_TABS.POLLS,
+                    controlsId: `${CHAT_TABS.POLLS}-panel`,
                     label: t('chat.tabs.polls')
                 }
                 ] } />
diff --git a/react/features/chat/components/web/ChatInput.tsx b/react/features/chat/components/web/ChatInput.tsx
index e4451551e..2a8b40923 100644
--- a/react/features/chat/components/web/ChatInput.tsx
+++ b/react/features/chat/components/web/ChatInput.tsx
@@ -115,7 +115,6 @@ class ChatInput extends Component<IProps, IState> {
                         </div>
                     )}
                     <Input
-                        autoFocus = { true }
                         className = 'chat-input'
                         icon = { this.props._areSmileysDisabled ? undefined : IconFaceSmile }
                         iconClick = { this._toggleSmileysPanel }
diff --git a/react/features/desktop-picker/components/DesktopPicker.tsx b/react/features/desktop-picker/components/DesktopPicker.tsx
index 168e55809..f8741d4b6 100644
--- a/react/features/desktop-picker/components/DesktopPicker.tsx
+++ b/react/features/desktop-picker/components/DesktopPicker.tsx
@@ -191,7 +191,7 @@ class DesktopPicker extends PureComponent<IProps, IState> {
      * @inheritdoc
      */
     render() {
-        const { selectedTab, selectedSource, sources } = this.state;
+        const { selectedTab, selectedSource, sources, types } = this.state;
 
         return (
             <Dialog
@@ -204,14 +204,27 @@ class DesktopPicker extends PureComponent<IProps, IState> {
                 size = 'large'
                 titleKey = 'dialog.shareYourScreen'>
                 { this._renderTabs() }
-                <DesktopPickerPane
-                    key = { selectedTab }
-                    onClick = { this._onPreviewClick }
-                    onDoubleClick = { this._onSubmit }
-                    onShareAudioChecked = { this._onShareAudioChecked }
-                    selectedSourceId = { selectedSource.id }
-                    sources = { sources[selectedTab as keyof typeof sources] }
-                    type = { selectedTab } />
+                {types.map(type => (
+                    <div
+                        aria-labelledby = { `${type}-button` }
+                        className = { selectedTab === type ? undefined : 'hide' }
+                        id = { `${type}-panel` }
+                        key = { type }
+                        role = 'tabpanel'
+                        tabIndex = { 0 }>
+                        {selectedTab === type && (
+                            <DesktopPickerPane
+                                key = { selectedTab }
+                                onClick = { this._onPreviewClick }
+                                onDoubleClick = { this._onSubmit }
+                                onShareAudioChecked = { this._onShareAudioChecked }
+                                selectedSourceId = { selectedSource.id }
+                                sources = { sources[selectedTab as keyof typeof sources] }
+                                type = { selectedTab } />
+                        )}
+                    </div>
+                ))}
+
             </Dialog>
         );
     }
@@ -348,17 +361,18 @@ class DesktopPicker extends PureComponent<IProps, IState> {
                 type => {
                     return {
                         accessibilityLabel: t(TAB_LABELS[type as keyof typeof TAB_LABELS]),
-                        id: type,
+                        id: `${type}-tab`,
+                        controlsId: `${type}-panel`,
                         label: t(TAB_LABELS[type as keyof typeof TAB_LABELS])
                     };
                 });
 
         return (
             <Tabs
-                accessibilityLabel = ''
+                accessibilityLabel = { t('dialog.sharingTabs') }
                 className = 'desktop-picker-tabs-container'
                 onChange = { this._onTabSelected }
-                selected = { this.state.selectedTab }
+                selected = { `${this.state.selectedTab}-tab` }
                 tabs = { tabs } />);
     }
 
diff --git a/react/features/polls/components/web/PollsPane.tsx b/react/features/polls/components/web/PollsPane.tsx
index bec99b053..c1cf624ee 100644
--- a/react/features/polls/components/web/PollsPane.tsx
+++ b/react/features/polls/components/web/PollsPane.tsx
@@ -40,7 +40,6 @@ const PollsPane = ({ createMode, onCreate, setCreateMode, t }: AbstractProps) =>
             <div className = { classes.footer }>
                 <Button
                     accessibilityLabel = { t('polls.create.create') }
-                    autoFocus = { true }
                     fullWidth = { true }
                     labelKey = { 'polls.create.create' }
                     onClick = { onCreate } />
diff --git a/react/features/welcome/components/Tab.js b/react/features/welcome/components/Tab.js
deleted file mode 100644
index c38a15429..000000000
--- a/react/features/welcome/components/Tab.js
+++ /dev/null
@@ -1,76 +0,0 @@
-// @flow
-import React, { Component } from 'react';
-
-/**
- * The type of the React {@code Component} props of {@link Tab}.
- */
-type Props = {
-
-    /**
-     * The index of the tab.
-     */
-    index: number,
-
-    /**
-     * Indicates if the tab is selected or not.
-     */
-    isSelected: boolean,
-
-    /**
-     * The label of the tab.
-     */
-    label: string,
-
-    /**
-     * Handler for selecting the tab.
-     */
-    onSelect: Function
-}
-
-/**
- * A React component that implements tabs.
- *
- */
-export default class Tab extends Component<Props> {
-    /**
-     * Initializes a new {@code Tab} instance.
-     *
-     * @inheritdoc
-     */
-    constructor(props: Props) {
-        super(props);
-
-        this._onSelect = this._onSelect.bind(this);
-    }
-
-    _onSelect: () => void;
-
-    /**
-     * Selects a tab.
-     *
-     * @returns {void}
-     */
-    _onSelect() {
-        const { index, onSelect } = this.props;
-
-        onSelect(index);
-    }
-
-    /**
-     * Implements the React Components's render method.
-     *
-     * @inheritdoc
-     */
-    render() {
-        const { index, isSelected, label } = this.props;
-        const className = `tab${isSelected ? ' selected' : ''}`;
-
-        return (
-            <div
-                className = { className }
-                key = { index }
-                onClick = { this._onSelect }>
-                { label }
-            </div>);
-    }
-}
diff --git a/react/features/welcome/components/Tabs.js b/react/features/welcome/components/Tabs.js
index e6cd3c129..70ba7ac9e 100644
--- a/react/features/welcome/components/Tabs.js
+++ b/react/features/welcome/components/Tabs.js
@@ -1,7 +1,5 @@
 // @flow
-import React, { Component } from 'react';
-
-import Tab from './Tab';
+import React, { useCallback, useEffect, useState } from 'react';
 
 /**
  * The type of the React {@code Component} props of {@link Tabs}.
@@ -9,14 +7,10 @@ import Tab from './Tab';
 type Props = {
 
     /**
-     * Handler for selecting the tab.
+     * Accessibility label for the tabs container.
+     *
      */
-    onSelect: Function,
-
-    /**
-     * The index of the selected tab.
-     */
-    selected: number,
+    accessibilityLabel: string,
 
     /**
      * Tabs information.
@@ -27,44 +21,87 @@ type Props = {
 /**
  * A React component that implements tabs.
  *
+ * @returns {ReactElement} The component.
  */
-export default class Tabs extends Component<Props> {
-    static defaultProps = {
-        tabs: [],
-        selected: 0
-    };
+const Tabs = ({ accessibilityLabel, tabs }: Props) => {
+    const [ current, setCurrent ] = useState(0);
 
-    /**
-     * Implements the React Components's render method.
-     *
-     * @inheritdoc
-     */
-    render() {
-        const { onSelect, selected, tabs } = this.props;
-        const { content = null } = tabs.length
-            ? tabs[Math.min(selected, tabs.length - 1)]
-            : {};
+    const onClick = useCallback(index => event => {
+        event.preventDefault();
+        setCurrent(index);
+    }, []);
 
-        return (
-            <div className = 'tab-container'>
-                { tabs.length > 1 ? (
-                    <div className = 'tab-buttons'>
-                        {
-                            tabs.map((tab, index) => (
-                                <Tab
-                                    index = { index }
-                                    isSelected = { index === selected }
-                                    key = { index }
-                                    label = { tab.label }
-                                    onSelect = { onSelect } />
-                            ))
-                        }
-                    </div>) : null
-                }
-                <div className = 'tab-content'>
-                    { content }
-                </div>
-            </div>
-        );
-    }
-}
+    const onKeyDown = useCallback(index => event => {
+        let newIndex = null;
+
+        if (event.key === 'ArrowLeft') {
+            event.preventDefault();
+            newIndex = index === 0 ? tabs.length - 1 : index - 1;
+        }
+
+        if (event.key === 'ArrowRight') {
+            event.preventDefault();
+            newIndex = index === tabs.length - 1 ? 0 : index + 1;
+        }
+
+        if (newIndex !== null) {
+            setCurrent(newIndex);
+        }
+    }, [ tabs ]);
+
+    useEffect(() => {
+        // this test is needed to make sure the effect is triggered because of user actually changing tab
+        if (document.activeElement?.getAttribute('role') === 'tab') {
+            document.querySelector(`#${`${tabs[current].id}-tab`}`)?.focus();
+        }
+
+    }, [ current, tabs ]);
+
+    return (
+        <div className = 'tab-container'>
+            { tabs.length > 1
+                ? (
+                    <>
+                        <div
+                            aria-label = { accessibilityLabel }
+                            className = 'tab-buttons'
+                            role = 'tablist'>
+                            {tabs.map((tab, index) => (
+                                <button
+                                    aria-controls = { `${tab.id}-panel` }
+                                    aria-selected = { current === index ? 'true' : 'false' }
+                                    id = { `${tab.id}-tab` }
+                                    key = { tab.id }
+                                    onClick = { onClick(index) }
+                                    onKeyDown = { onKeyDown(index) }
+                                    role = 'tab'
+                                    tabIndex = { current === index ? undefined : -1 }>
+                                    {tab.label}
+                                </button>
+                            ))}
+                        </div>
+                        {tabs.map((tab, index) => (
+                            <div
+                                aria-labelledby = { `${tab.id}-tab` }
+                                className = { current === index ? 'tab-content' : 'hide' }
+                                id = { `${tab.id}-panel` }
+                                key = { tab.id }
+                                role = 'tabpanel'
+                                tabIndex = { 0 }>
+                                {tab.content}
+                            </div>
+                        ))}
+                    </>
+                )
+                : (
+                    <>
+                        <h2 className = 'sr-only'>{accessibilityLabel}</h2>
+                        <div className = 'tab-content'>{tabs[0].content}</div>
+                    </>
+                )
+            }
+        </div>
+    );
+};
+
+export default Tabs;
diff --git a/react/features/welcome/components/WelcomePage.web.js b/react/features/welcome/components/WelcomePage.web.js
index b2c0a86e4..8bc783836 100644
--- a/react/features/welcome/components/WelcomePage.web.js
+++ b/react/features/welcome/components/WelcomePage.web.js
@@ -49,8 +49,7 @@ class WelcomePage extends AbstractWelcomePage {
             ...this.state,
 
             generateRoomnames:
-                interfaceConfig.GENERATE_ROOMNAMES_ON_WELCOME_PAGE,
-            selectedTab: 0
+                interfaceConfig.GENERATE_ROOMNAMES_ON_WELCOME_PAGE
         };
 
         /**
@@ -114,7 +113,6 @@ class WelcomePage extends AbstractWelcomePage {
         this._setRoomInputRef = this._setRoomInputRef.bind(this);
         this._setAdditionalToolbarContentRef
             = this._setAdditionalToolbarContentRef.bind(this);
-        this._onTabSelected = this._onTabSelected.bind(this);
         this._renderFooter = this._renderFooter.bind(this);
     }
 
@@ -326,18 +324,6 @@ class WelcomePage extends AbstractWelcomePage {
         super._onRoomChange(event.target.value);
     }
 
-    /**
-     * Callback invoked when the desired tab to display should be changed.
-     *
-     * @param {number} tabIndex - The index of the tab within the array of
-     * displayed tabs.
-     * @private
-     * @returns {void}
-     */
-    _onTabSelected(tabIndex) {
-        this.setState({ selectedTab: tabIndex });
-    }
-
     /**
      * Renders the footer.
      *
@@ -405,6 +391,7 @@ class WelcomePage extends AbstractWelcomePage {
 
         if (_calendarEnabled) {
             tabs.push({
+                id: 'calendar',
                 label: t('welcomepage.upcomingMeetings'),
                 content: <CalendarList />
             });
@@ -412,6 +399,7 @@ class WelcomePage extends AbstractWelcomePage {
 
         if (_recentListEnabled) {
             tabs.push({
+                id: 'recent',
                 label: t('welcomepage.recentMeetings'),
                 content: <RecentList />
             });
@@ -423,9 +411,9 @@ class WelcomePage extends AbstractWelcomePage {
 
         return (
             <Tabs
-                onSelect = { this._onTabSelected }
-                selected = { this.state.selectedTab }
-                tabs = { tabs } />);
+                accessibilityLabel = { t('welcomepage.meetingsAccessibilityLabel') }
+                tabs = { tabs } />
+        );
     }
 
     /**