diff --git a/.eslintrc.yml b/.eslintrc.yml
index 2c264351e..fd2ba46dd 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -121,6 +121,6 @@ rules:
   jsx-a11y/onclick-has-focus: warn
   jsx-a11y/onclick-has-role: warn
   jsx-a11y/role-has-required-aria-props: warn
-  jsx-a11y/role-supports-aria-props: warn
+  jsx-a11y/role-supports-aria-props: off
   jsx-a11y/scope: warn
   jsx-a11y/tabindex-no-positive: warn
diff --git a/app/javascript/mastodon/components/dropdown_menu.js b/app/javascript/mastodon/components/dropdown_menu.js
index 8e9e6ab94..f62a75183 100644
--- a/app/javascript/mastodon/components/dropdown_menu.js
+++ b/app/javascript/mastodon/components/dropdown_menu.js
@@ -74,6 +74,18 @@ export default class DropdownMenu extends React.PureComponent {
 
   handleHide = () => this.setState({ expanded: false })
 
+  handleToggle = (e) => {
+    if (e.key === 'Enter') {
+      if (this.props.isUserTouching()) {
+        this.handleShow();
+      } else {
+        this.setState({ expanded: !this.state.expanded });
+      }
+    } else if (e.key === 'Escape') {
+      this.setState({ expanded: false });
+    }
+  }
+
   renderItem = (item, i) => {
     if (item === null) {
       return <li key={`sep-${i}`} className='dropdown__sep' />;
@@ -83,7 +95,7 @@ export default class DropdownMenu extends React.PureComponent {
 
     return (
       <li className='dropdown__content-list-item' key={`${text}-${i}`}>
-        <a href={href} target='_blank' rel='noopener' onClick={this.handleClick} data-index={i} className='dropdown__content-list-link'>
+        <a href={href} target='_blank' rel='noopener' role='button' tabIndex='0' autoFocus={i === 0} onClick={this.handleClick} data-index={i} className='dropdown__content-list-link'>
           {text}
         </a>
       </li>
@@ -107,7 +119,7 @@ export default class DropdownMenu extends React.PureComponent {
     }
 
     const dropdownItems = expanded && (
-      <ul className='dropdown__content-list'>
+      <ul role='group' className='dropdown__content-list' onClick={this.handleHide}>
         {items.map(this.renderItem)}
       </ul>
     );
@@ -115,14 +127,14 @@ export default class DropdownMenu extends React.PureComponent {
     // No need to render the actual dropdown if we use the modal. If we
     // don't render anything <Dropdow /> breaks, so we just put an empty div.
     const dropdownContent = !isUserTouching ? (
-      <DropdownContent className={directionClass}>
+      <DropdownContent className={directionClass} >
         {dropdownItems}
       </DropdownContent>
     ) : <div />;
 
     return (
-      <Dropdown ref={this.setRef} active={isUserTouching ? false : undefined} onShow={this.handleShow} onHide={this.handleHide}>
-        <DropdownTrigger className='icon-button' style={iconStyle} aria-label={ariaLabel}>
+      <Dropdown ref={this.setRef} active={isUserTouching ? false : expanded} onShow={this.handleShow} onHide={this.handleHide}>
+        <DropdownTrigger className='icon-button' style={iconStyle} role='button' aria-pressed={expanded} onKeyDown={this.handleToggle} tabIndex='0' aria-label={ariaLabel}>
           <i className={iconClassname} aria-hidden />
         </DropdownTrigger>
 
diff --git a/app/javascript/mastodon/components/icon_button.js b/app/javascript/mastodon/components/icon_button.js
index ac734f5ad..febdabbc0 100644
--- a/app/javascript/mastodon/components/icon_button.js
+++ b/app/javascript/mastodon/components/icon_button.js
@@ -12,12 +12,14 @@ export default class IconButton extends React.PureComponent {
     onClick: PropTypes.func,
     size: PropTypes.number,
     active: PropTypes.bool,
+    pressed: PropTypes.bool,
     style: PropTypes.object,
     activeStyle: PropTypes.object,
     disabled: PropTypes.bool,
     inverted: PropTypes.bool,
     animate: PropTypes.bool,
     overlay: PropTypes.bool,
+    tabIndex: PropTypes.string,
   };
 
   static defaultProps = {
@@ -26,6 +28,7 @@ export default class IconButton extends React.PureComponent {
     disabled: false,
     animate: false,
     overlay: false,
+    tabIndex: '0',
   };
 
   handleClick = (e) =>  {
@@ -73,10 +76,12 @@ export default class IconButton extends React.PureComponent {
         {({ rotate }) =>
           <button
             aria-label={this.props.title}
+            aria-pressed={this.props.pressed}
             title={this.props.title}
             className={classes.join(' ')}
             onClick={this.handleClick}
             style={style}
+            tabIndex={this.props.tabIndex}
           >
             <i style={{ transform: `rotate(${rotate}deg)` }} className={`fa fa-fw fa-${this.props.icon}`} aria-hidden='true' />
           </button>
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index 0d7f6deb1..dc32a65ae 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -41,6 +41,8 @@ export default class Status extends ImmutablePureComponent {
     autoPlayGif: PropTypes.bool,
     muted: PropTypes.bool,
     intersectionObserverWrapper: PropTypes.object,
+    index: PropTypes.oneOf(PropTypes.string, PropTypes.number),
+    listLength: PropTypes.oneOf(PropTypes.string, PropTypes.number),
   };
 
   state = {
@@ -59,6 +61,7 @@ export default class Status extends ImmutablePureComponent {
     'boostModal',
     'autoPlayGif',
     'muted',
+    'listLength',
   ]
 
   updateOnStates = ['isExpanded']
@@ -67,8 +70,8 @@ export default class Status extends ImmutablePureComponent {
     if (!nextState.isIntersecting && nextState.isHidden) {
       // It's only if we're not intersecting (i.e. offscreen) and isHidden is true
       // that either "isIntersecting" or "isHidden" matter, and then they're
-      // the only things that matter.
-      return this.state.isIntersecting || !this.state.isHidden;
+      // the only things that matter (and updated ARIA attributes).
+      return this.state.isIntersecting || !this.state.isHidden || nextProps.listLength !== this.props.listLength;
     } else if (nextState.isIntersecting && !this.state.isIntersecting) {
       // If we're going from a non-intersecting state to an intersecting state,
       // (i.e. offscreen to onscreen), then we definitely need to re-render
@@ -169,7 +172,7 @@ export default class Status extends ImmutablePureComponent {
 
     // Exclude intersectionObserverWrapper from `other` variable
     // because intersection is managed in here.
-    const { status, account, intersectionObserverWrapper, ...other } = this.props;
+    const { status, account, intersectionObserverWrapper, index, listLength, ...other } = this.props;
     const { isExpanded, isIntersecting, isHidden } = this.state;
 
     if (status === null) {
@@ -178,10 +181,10 @@ export default class Status extends ImmutablePureComponent {
 
     if (!isIntersecting && isHidden) {
       return (
-        <div ref={this.handleRef} data-id={status.get('id')} style={{ height: `${this.height}px`, opacity: 0, overflow: 'hidden' }}>
+        <article ref={this.handleRef} data-id={status.get('id')} aria-posinset={index} aria-setsize={listLength} style={{ height: `${this.height}px`, opacity: 0, overflow: 'hidden' }}>
           {status.getIn(['account', 'display_name']) || status.getIn(['account', 'username'])}
           {status.get('content')}
-        </div>
+        </article>
       );
     }
 
@@ -195,14 +198,14 @@ export default class Status extends ImmutablePureComponent {
       const displayNameHTML = { __html: emojify(escapeTextContentForBrowser(displayName)) };
 
       return (
-        <div className='status__wrapper' ref={this.handleRef} data-id={status.get('id')} >
+        <article className='status__wrapper' ref={this.handleRef} data-id={status.get('id')} aria-posinset={index} aria-setsize={listLength}>
           <div className='status__prepend'>
             <div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-retweet status__prepend-icon' /></div>
             <FormattedMessage id='status.reblogged_by' defaultMessage='{name} boosted' values={{ name: <a onClick={this.handleAccountClick} data-id={status.getIn(['account', 'id'])} href={status.getIn(['account', 'url'])} className='status__display-name muted'><strong dangerouslySetInnerHTML={displayNameHTML} /></a> }} />
           </div>
 
           <Status {...other} wrapped status={status.get('reblog')} account={status.get('account')} />
-        </div>
+        </article>
       );
     }
 
@@ -231,7 +234,7 @@ export default class Status extends ImmutablePureComponent {
     }
 
     return (
-      <div className={`status ${this.props.muted ? 'muted' : ''} status-${status.get('visibility')}`} data-id={status.get('id')} ref={this.handleRef}>
+      <article aria-posinset={index} aria-setsize={listLength} className={`status ${this.props.muted ? 'muted' : ''} status-${status.get('visibility')}`} data-id={status.get('id')} ref={this.handleRef}>
         <div className='status__info'>
           <a href={status.get('url')} className='status__relative-time' target='_blank' rel='noopener'><RelativeTimestamp timestamp={status.get('created_at')} /></a>
 
@@ -249,7 +252,7 @@ export default class Status extends ImmutablePureComponent {
         {media}
 
         <StatusActionBar {...this.props} />
-      </div>
+      </article>
     );
   }
 
diff --git a/app/javascript/mastodon/components/status_list.js b/app/javascript/mastodon/components/status_list.js
index 48858cf13..9406b5fb9 100644
--- a/app/javascript/mastodon/components/status_list.js
+++ b/app/javascript/mastodon/components/status_list.js
@@ -113,11 +113,11 @@ export default class StatusList extends ImmutablePureComponent {
     if (isLoading || statusIds.size > 0 || !emptyMessage) {
       scrollableArea = (
         <div className='scrollable' ref={this.setRef}>
-          <div className='status-list'>
+          <div role='feed' className='status-list'>
             {prepend}
 
-            {statusIds.map((statusId) => {
-              return <StatusContainer key={statusId} id={statusId} intersectionObserverWrapper={this.intersectionObserverWrapper} />;
+            {statusIds.map((statusId, index) => {
+              return <StatusContainer key={statusId} id={statusId} index={index} listLength={statusIds.size} intersectionObserverWrapper={this.intersectionObserverWrapper} />;
             })}
 
             {loadMore}
diff --git a/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js b/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
index acc584f20..b0f3b30fc 100644
--- a/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/emoji_picker_dropdown.js
@@ -65,6 +65,22 @@ export default class EmojiPickerDropdown extends React.PureComponent {
     this.setState({ active: false });
   }
 
+  onToggle = (e) => {
+    if (!this.state.loading && (!e.key || e.key === 'Enter')) {
+      if (this.state.active) {
+        this.onHideDropdown();
+      } else {
+        this.onShowDropdown();
+      }
+    }
+  }
+
+  onEmojiPickerKeyDown = (e) => {
+    if (e.key === 'Escape') {
+      this.onHideDropdown();
+    }
+  }
+
   render () {
     const { intl } = this.props;
 
@@ -104,10 +120,11 @@ export default class EmojiPickerDropdown extends React.PureComponent {
     };
 
     const { active, loading } = this.state;
+    const title = intl.formatMessage(messages.emoji);
 
     return (
-      <Dropdown ref={this.setRef} className='emoji-picker__dropdown' onShow={this.onShowDropdown} onHide={this.onHideDropdown}>
-        <DropdownTrigger className='emoji-button' title={intl.formatMessage(messages.emoji)}>
+      <Dropdown ref={this.setRef} className='emoji-picker__dropdown' active={active && !loading} onShow={this.onShowDropdown} onHide={this.onHideDropdown}>
+        <DropdownTrigger className='emoji-button' title={title} aria-label={title} aria-pressed={active} role='button' onKeyDown={this.onToggle} tabIndex={0} >
           <img
             className={`emojione ${active && loading ? 'pulse-loading' : ''}`}
             alt='🙂'
@@ -118,7 +135,7 @@ export default class EmojiPickerDropdown extends React.PureComponent {
         <DropdownContent className='dropdown__left'>
           {
             this.state.active && !this.state.loading &&
-            (<EmojiPicker emojione={settings} onChange={this.handleChange} searchPlaceholder={intl.formatMessage(messages.emoji_search)} categories={categories} search />)
+            (<EmojiPicker emojione={settings} onChange={this.handleChange} searchPlaceholder={intl.formatMessage(messages.emoji_search)} onKeyDown={this.onEmojiPickerKeyDown} categories={categories} search />)
           }
         </DropdownContent>
       </Dropdown>
diff --git a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
index 33ce7db46..f331df382 100644
--- a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
@@ -60,10 +60,14 @@ export default class PrivacyDropdown extends React.PureComponent {
   }
 
   handleClick = (e) => {
-    const value = e.currentTarget.getAttribute('data-index');
-    e.preventDefault();
-    this.setState({ open: false });
-    this.props.onChange(value);
+    if (e.key === 'Escape') {
+      this.setState({ open: false });
+    } else if (!e.key || e.key === 'Enter') {
+      const value = e.currentTarget.getAttribute('data-index');
+      e.preventDefault();
+      this.setState({ open: false });
+      this.props.onChange(value);
+    }
   }
 
   onGlobalClick = (e) => {
@@ -105,10 +109,10 @@ export default class PrivacyDropdown extends React.PureComponent {
 
     return (
       <div ref={this.setRef} className={`privacy-dropdown ${open ? 'active' : ''}`}>
-        <div className='privacy-dropdown__value'><IconButton className='privacy-dropdown__value-icon' icon={valueOption.icon} title={intl.formatMessage(messages.change_privacy)} size={18} active={open} inverted onClick={this.handleToggle} style={iconStyle} /></div>
+        <div className='privacy-dropdown__value'><IconButton className='privacy-dropdown__value-icon' icon={valueOption.icon} title={intl.formatMessage(messages.change_privacy)} size={18} pressed={open} active={open} inverted onClick={this.handleToggle} style={iconStyle} /></div>
         <div className='privacy-dropdown__dropdown'>
           {open && this.options.map(item =>
-            <div role='button' tabIndex='0' key={item.value} data-index={item.value} onClick={this.handleClick} className={`privacy-dropdown__option ${item.value === value ? 'active' : ''}`}>
+            <div role='button' tabIndex='0' key={item.value} data-index={item.value} onKeyDown={this.handleClick} onClick={this.handleClick} className={`privacy-dropdown__option ${item.value === value ? 'active' : ''}`}>
               <div className='privacy-dropdown__option__icon'><i className={`fa fa-fw fa-${item.icon}`} /></div>
               <div className='privacy-dropdown__option__content'>
                 <strong>{item.text}</strong>
diff --git a/app/javascript/mastodon/features/notifications/components/setting_toggle.js b/app/javascript/mastodon/features/notifications/components/setting_toggle.js
index be1ff91d6..a20e7ca51 100644
--- a/app/javascript/mastodon/features/notifications/components/setting_toggle.js
+++ b/app/javascript/mastodon/features/notifications/components/setting_toggle.js
@@ -18,13 +18,19 @@ export default class SettingToggle extends React.PureComponent {
     this.props.onChange(this.props.settingKey, target.checked);
   }
 
+  onKeyDown = e => {
+    if (e.key === ' ') {
+      this.props.onChange(this.props.settingKey, !e.target.checked);
+    }
+  }
+
   render () {
     const { prefix, settings, settingKey, label, meta } = this.props;
     const id = ['setting-toggle', prefix, ...settingKey].filter(Boolean).join('-');
 
     return (
       <div className='setting-toggle'>
-        <Toggle id={id} checked={settings.getIn(settingKey)} onChange={this.onChange} />
+        <Toggle id={id} checked={settings.getIn(settingKey)} onChange={this.onChange} onKeyDown={this.onKeyDown} />
         <label htmlFor={id} className='setting-toggle__label'>{label}</label>
         {meta && <span className='setting-meta__label'>{meta}</span>}
       </div>
diff --git a/app/javascript/mastodon/features/ui/components/actions_modal.js b/app/javascript/mastodon/features/ui/components/actions_modal.js
index a7b7357b6..cc0620d1c 100644
--- a/app/javascript/mastodon/features/ui/components/actions_modal.js
+++ b/app/javascript/mastodon/features/ui/components/actions_modal.js
@@ -24,7 +24,7 @@ export default class ActionsModal extends ImmutablePureComponent {
     return (
       <li key={`${text}-${i}`}>
         <a href={href} target='_blank' rel='noopener' onClick={this.props.onClick} data-index={i} className={active && 'active'}>
-          {icon && <IconButton title={text} icon={icon} />}
+          {icon && <IconButton title={text} icon={icon} role='presentation' tabIndex='-1' />}
           <div>
             <div>{text}</div>
             <div>{meta}</div>