Add skip navigation button

cypress/integration/navigation.js

@@ -9,12 +9,24 @@ describe('Navigation', () => {
 
             ListPage.waitUntilVisible();
 
-            cy.get('body').tab().tab().tab();
+            cy.get('body').tab().tab().tab().tab();
 
             cy.get(`${ListPage.elements.menuItems}:first-child`).should(
                 'have.class',
                 'Mui-focusVisible'
             );
         });
     });
+
+    describe('Skip Navigation Button', () => {
+        it('should appear when a user immediately tabs on the homepage', () => {
+            ListPage.navigate();
+
+            ListPage.waitUntilVisible();
+
+            cy.get('body').tab();
+
+            cy.get(ListPage.elements.skipNavButton).should('exist');
+        });
+    });
 });

cypress/support/ListPage.js

@@ -31,6 +31,7 @@ export default url => ({
         title: '#react-admin-title',
         headroomUnfixed: '.headroom--unfixed',
         headroomUnpinned: '.headroom--unpinned',
+        skipNavButton: '.skip-nav-button',
     },
 
     navigate() {

packages/ra-language-english/src/index.ts

@@ -103,6 +103,7 @@ const englishMessages: TranslationMessages = {
             page_rows_per_page: 'Rows per page:',
             next: 'Next',
             prev: 'Prev',
+            skip_nav: 'Skip to content',
         },
         sort: {
             sort_by: 'Sort by %{field} %{order}',

packages/ra-ui-materialui/src/button/SkipNavigationButton.tsx

@@ -0,0 +1,70 @@
+import React from 'react';
+import { makeStyles } from '@material-ui/core/styles';
+import Button from './Button';
+import { useTranslate } from 'ra-core';
+import classnames from 'classnames';
+
+function skipToContent() {
+    const element = document.getElementById('main-content');
+
+    if (!element) {
+        if (process.env.NODE_ENV !== 'production') {
+            console.warn(
+                'No element with id "main-content" was found. Ensure the element that contains your main content has an id of "main-content".'
+            );
+        }
+
+        return;
+    }
+
+    element.setAttribute('tabIndex', '-1');
+    element.focus();
+    element.blur();
+    element.removeAttribute('tabIndex');
+}
+
+const useStyles = makeStyles(theme => ({
+    skipToContentButton: {
+        position: 'fixed',
+        padding: theme.spacing(1),
+        backgroundColor: theme.palette.background.default,
+        color: theme.palette.getContrastText(theme.palette.background.default),
+        transition: theme.transitions.create(['top', 'opacity'], {
+            easing: theme.transitions.easing.easeIn,
+            duration: theme.transitions.duration.leavingScreen,
+        }),
+        left: theme.spacing(2),
+        top: theme.spacing(-10),
+        zIndex: 5000,
+        '&:hover': {
+            opacity: 0.8,
+            backgroundColor: theme.palette.background.default,
+        },
+        '&:focus': {
+            top: theme.spacing(2),
+            transition: theme.transitions.create(['top', 'opacity'], {
+                easing: theme.transitions.easing.easeOut,
+                duration: theme.transitions.duration.enteringScreen,
+            }),
+        },
+    },
+}));
+
+function SkipNavigationButton() {
+    const classes = useStyles();
+    const translate = useTranslate();
+
+    return (
+        <Button
+            onClick={skipToContent}
+            className={classnames(
+                classes.skipToContentButton,
+                'skip-nav-button'
+            )}
+            label={translate('ra.navigation.skip_nav')}
+            variant="contained"
+        />
+    );
+}
+
+export default SkipNavigationButton;

packages/ra-ui-materialui/src/layout/Layout.tsx

@@ -30,6 +30,7 @@ import DefaultMenu, { MenuProps } from './Menu';
 import DefaultNotification from './Notification';
 import DefaultError from './Error';
 import defaultTheme from '../defaultTheme';
+import SkipNavigationButton from '../button/SkipNavigationButton';
 
 const styles = theme =>
     createStyles({
@@ -130,6 +131,7 @@ class LayoutWithoutTheme extends Component<
                     className={classnames('layout', classes.root, className)}
                     {...props}
                 >
+                    <SkipNavigationButton />
                     <div className={classes.appFrame}>
                         {createElement(appBar, { title, open, logout })}
                         <main className={classes.contentWithSidebar}>
@@ -139,7 +141,7 @@ class LayoutWithoutTheme extends Component<
                                     hasDashboard: !!dashboard,
                                 }),
                             })}
-                            <div className={classes.content}>
+                            <div id="main-content" className={classes.content}>
                                 {hasError
                                     ? createElement(error, {
                                           error: errorMessage,