diff --git a/app/javascript/mastodon/components/extended_video_player.js b/app/javascript/mastodon/components/extended_video_player.js
index 9e2f6835a..009c0d559 100644
--- a/app/javascript/mastodon/components/extended_video_player.js
+++ b/app/javascript/mastodon/components/extended_video_player.js
@@ -50,6 +50,7 @@ export default class ExtendedVideoPlayer extends React.PureComponent {
           role='button'
           tabIndex='0'
           aria-label={alt}
+          title={alt}
           muted={muted}
           controls={controls}
           loop={!controls}
diff --git a/app/javascript/mastodon/components/media_gallery.js b/app/javascript/mastodon/components/media_gallery.js
index 63bc4a59b..6e1310cd6 100644
--- a/app/javascript/mastodon/components/media_gallery.js
+++ b/app/javascript/mastodon/components/media_gallery.js
@@ -154,6 +154,7 @@ class Item extends React.PureComponent {
           <video
             className='media-gallery__item-gifv-thumbnail'
             aria-label={attachment.get('description')}
+            title={attachment.get('description')}
             role='application'
             src={attachment.get('url')}
             onClick={this.handleClick}
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index 9a3fd3576..9809a9a32 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -230,6 +230,7 @@ export default class Status extends ImmutablePureComponent {
               <Component
                 preview={video.get('preview_url')}
                 src={video.get('url')}
+                alt={video.get('description')}
                 width={239}
                 height={110}
                 inline
diff --git a/app/javascript/mastodon/features/report/components/status_check_box.js b/app/javascript/mastodon/features/report/components/status_check_box.js
index 9ff75a082..2552d94d8 100644
--- a/app/javascript/mastodon/features/report/components/status_check_box.js
+++ b/app/javascript/mastodon/features/report/components/status_check_box.js
@@ -36,6 +36,7 @@ export default class StatusCheckBox extends React.PureComponent {
               <Component
                 preview={video.get('preview_url')}
                 src={video.get('url')}
+                alt={video.get('description')}
                 width={239}
                 height={110}
                 inline
diff --git a/app/javascript/mastodon/features/status/components/detailed_status.js b/app/javascript/mastodon/features/status/components/detailed_status.js
index 12ffb7579..b4bbda161 100644
--- a/app/javascript/mastodon/features/status/components/detailed_status.js
+++ b/app/javascript/mastodon/features/status/components/detailed_status.js
@@ -60,6 +60,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
           <Video
             preview={video.get('preview_url')}
             src={video.get('url')}
+            alt={video.get('description')}
             width={300}
             height={150}
             inline
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 55ea32acb..52b395f88 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -315,6 +315,7 @@ export default class Video extends React.PureComponent {
           role='button'
           tabIndex='0'
           aria-label={alt}
+          title={alt}
           width={width}
           height={height}
           onClick={this.togglePlay}
diff --git a/app/views/admin/reports/_status.html.haml b/app/views/admin/reports/_status.html.haml
index 5b410ec84..4d557b071 100644
--- a/app/views/admin/reports/_status.html.haml
+++ b/app/views/admin/reports/_status.html.haml
@@ -14,7 +14,7 @@
     - unless status.proper.media_attachments.empty?
       - if status.proper.media_attachments.first.video?
         - video = status.proper.media_attachments.first
-        = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.proper.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 610, height: 343, inline: true
+        = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.proper.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 610, height: 343, inline: true, alt: video.description
       - else
         = react_component :media_gallery, height: 343, sensitive: status.proper.sensitive? && !current_account&.user&.setting_display_sensitive_media, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.proper.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }
 
diff --git a/app/views/stream_entries/_detailed_status.html.haml b/app/views/stream_entries/_detailed_status.html.haml
index a7c767816..7843005c1 100644
--- a/app/views/stream_entries/_detailed_status.html.haml
+++ b/app/views/stream_entries/_detailed_status.html.haml
@@ -21,7 +21,7 @@
   - if !status.media_attachments.empty?
     - if status.media_attachments.first.video?
       - video = status.media_attachments.first
-      = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 670, height: 380, detailed: true, inline: true
+      = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 670, height: 380, detailed: true, inline: true, alt: video.description
     - else
       = react_component :media_gallery, height: 380, sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, standalone: true, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, 'reduceMotion': current_account&.user&.setting_reduce_motion, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }
   - elsif status.preview_cards.first
diff --git a/app/views/stream_entries/_simple_status.html.haml b/app/views/stream_entries/_simple_status.html.haml
index ec8b69bb6..875795f2a 100644
--- a/app/views/stream_entries/_simple_status.html.haml
+++ b/app/views/stream_entries/_simple_status.html.haml
@@ -24,7 +24,7 @@
   - unless status.media_attachments.empty?
     - if status.media_attachments.first.video?
       - video = status.media_attachments.first
-      = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 610, height: 343, inline: true
+      = react_component :video, src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 610, height: 343, inline: true, alt: video.description
     - else
       = react_component :media_gallery, height: 343, sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }