diff --git a/app/frontend/javascript/controllers/carousel_controller.js b/app/frontend/javascript/controllers/carousel_controller.js
index 0acae43efa..4056ba6f96 100644
--- a/app/frontend/javascript/controllers/carousel_controller.js
+++ b/app/frontend/javascript/controllers/carousel_controller.js
@@ -9,6 +9,7 @@ import 'swiper/css/navigation'
 // Pass Swiper overrides via data-carousel-options-value='{ "slidesPerView": 2, ... }'.
 // Any keys provided there win over the defaults below (breakpoints replace wholesale).
 export default class extends Controller {
+  static targets = ["video"]
   static values = { options: Object }
 
   connect() {
@@ -40,6 +41,12 @@ export default class extends Controller {
     }
 
     this.swiper = new Swiper(this.element, { ...defaults, ...this.optionsValue })
+    this.swiper.on("slideChange", () => this.pauseVideos())
+  }
+
+  pauseVideos() {
+    const command = JSON.stringify({ event: "command", func: "pauseVideo", args: [] })
+    this.videoTargets.forEach((video) => video.contentWindow?.postMessage(command, "https://www.youtube.com"))
   }
 
   disconnect() {
diff --git a/app/helpers/story_shares_helper.rb b/app/helpers/story_shares_helper.rb
index 9d35bea0a3..a81f10f567 100644
--- a/app/helpers/story_shares_helper.rb
+++ b/app/helpers/story_shares_helper.rb
@@ -18,6 +18,8 @@ module StorySharesHelper
 
   STORY_IMAGE_ASPECT = "aspect-[3/2]".freeze
   STORY_BANNER_ASPECT = "aspect-[4/3] sm:aspect-[2/1]".freeze
+  # Zooms a 16:9 player until its letterboxed video covers the banner box at each breakpoint.
+  STORY_BANNER_VIDEO_SCALE = "scale-[1.34] sm:scale-[1.125]".freeze
   STORY_IMAGE_GUIDANCE = "Images look best as landscape photos in a 3:2 shape, at least 1800 × 1200 pixels. " \
     "A recent phone photo taken sideways works well. Tall images show in full on a blurred background. " \
     "Some spots trim the edges, so keep the main subject near the center.".freeze
diff --git a/app/helpers/youtube_helper.rb b/app/helpers/youtube_helper.rb
index d09c2a31e8..79460700ca 100644
--- a/app/helpers/youtube_helper.rb
+++ b/app/helpers/youtube_helper.rb
@@ -1,19 +1,34 @@
 module YoutubeHelper
-  def youtube_embed_url(url)
+  BACKGROUND_PLAYER_PARAMS = { autoplay: 1, mute: 1, loop: 1, controls: 0, playsinline: 1, disablekb: 1, rel: 0 }.freeze
+
+  # js_api lets the page send the player commands (e.g. pause) via postMessage.
+  def youtube_embed_url(url, js_api: false)
+    video_id = youtube_video_id(url)
+    return unless video_id
+
+    embed_url = "https://www.youtube.com/embed/#{video_id}"
+    js_api ? "#{embed_url}?enablejsapi=1" : embed_url
+  end
+
+  # Muted autoplay is the only autoplay browsers allow; loop needs the video listed as its own playlist.
+  def youtube_background_embed_url(url)
+    video_id = youtube_video_id(url)
+    return unless video_id
+
+    "https://www.youtube.com/embed/#{ERB::Util.url_encode(video_id)}?#{BACKGROUND_PLAYER_PARAMS.merge(playlist: video_id).to_query}"
+  end
+
+  def youtube_video_id(url)
     return if url.blank?
 
     uri = URI.parse(url) rescue nil
     return unless uri
 
-    if uri.host&.include?("youtu.be")
-      video_id = uri.path.delete_prefix("/")
+    video_id = if uri.host&.include?("youtu.be")
+      uri.path.delete_prefix("/")
     elsif uri.query
-      params = Rack::Utils.parse_query(uri.query)
-      video_id = params["v"]
+      Rack::Utils.parse_query(uri.query)["v"]
     end
-
-    return unless video_id
-
-    "https://www.youtube.com/embed/#{video_id}"
+    video_id.presence
   end
 end
diff --git a/app/views/assets/_display_assets_carousel.html.erb b/app/views/assets/_display_assets_carousel.html.erb
index 166170d95f..7ff8e30e75 100644
--- a/app/views/assets/_display_assets_carousel.html.erb
+++ b/app/views/assets/_display_assets_carousel.html.erb
@@ -1,15 +1,28 @@
 <%# Renders a resource's primary + gallery images as one carousel of uniform-size slides. %>
 <%# Every image is forced into the same fixed aspect box, so there is no hero/thumbnail size split. %>
+<%# Optional locals: video_url (YouTube embed URL with js_api, shown as the first slide); video_title. %>
 <%
+  video_url = local_assigns[:video_url]
   assets = []
   assets << resource.primary_asset if resource.respond_to?(:primary_asset) && resource.primary_asset&.file&.attached?
   assets += resource.gallery_assets.select { |asset| asset.file.attached? } if resource.respond_to?(:gallery_assets)
 %>
-<% if assets.any? %>
+<% slide_count = assets.size + (video_url ? 1 : 0) %>
+<% if slide_count.positive? %>
   <div data-controller="carousel"
        class="relative swiper my-6 w-full"
        data-carousel-options-value='{ "spaceBetween": 16, "slidesPerView": 1, "breakpoints": {} }'>
     <div class="swiper-wrapper">
+      <% if video_url %>
+        <div class="swiper-slide">
+          <div class="relative aspect-[3/2] overflow-hidden rounded-lg bg-black">
+            <iframe src="<%= video_url %>" title="<%= local_assigns[:video_title] %>"
+                    class="absolute inset-0 h-full w-full"
+                    data-carousel-target="video"
+                    allow="encrypted-media; picture-in-picture" allowfullscreen></iframe>
+          </div>
+        </div>
+      <% end %>
       <% assets.each_with_index do |asset, idx| %>
         <div class="swiper-slide">
           <% portrait = portrait_image?(asset.file) %>
@@ -25,7 +38,7 @@
       <% end %>
     </div>
 
-    <% if assets.size > 1 %>
+    <% if slide_count > 1 %>
       <button class="swiper-button-next-custom absolute top-1/2 -translate-y-1/2 right-2 w-12 h-12 rounded-full bg-white border border-gray-300 text-gray-700 shadow-md hover:shadow-lg flex items-center justify-center transition hover:bg-gray-50 z-40"
               aria-label="Next">
         <i class="fa-solid fa-chevron-right text-xl"></i>
diff --git a/app/views/stories/show.html.erb b/app/views/stories/show.html.erb
index 61f70f97f5..18d4deb6a2 100644
--- a/app/views/stories/show.html.erb
+++ b/app/views/stories/show.html.erb
@@ -51,7 +51,8 @@
           <div id="upload-progress-bar" class="h-full w-0 bg-blue-500 transition-[width] duration-200 ease-out"></div>
         </div>
         <div id="hero-image" class="relative">
-          <%= render "assets/display_assets_carousel", resource: @story %>
+          <%= render "assets/display_assets_carousel", resource: @story,
+                     video_url: youtube_embed_url(@story.youtube_url, js_api: true), video_title: "#{@story.title} video" %>
           <div class="absolute top-8 right-2 z-40">
             <%= render "assets/primary_image_picker", owner: @story %>
           </div>
diff --git a/app/views/story_shares/_banner_video.html.erb b/app/views/story_shares/_banner_video.html.erb
new file mode 100644
index 0000000000..d83319483a
--- /dev/null
+++ b/app/views/story_shares/_banner_video.html.erb
@@ -0,0 +1,9 @@
+<%# Muted, looping YouTube player covering a banner box, decorative so the slide link and swipe stay live.
+    Locals: story. %>
+<% if (embed_url = youtube_background_embed_url(story.youtube_url)) %>
+  <iframe src="<%= embed_url %>"
+          title="<%= story.title %> video"
+          class="pointer-events-none absolute inset-0 h-full w-full <%= StorySharesHelper::STORY_BANNER_VIDEO_SCALE %>"
+          allow="autoplay; encrypted-media; picture-in-picture"
+          tabindex="-1" aria-hidden="true"></iframe>
+<% end %>
diff --git a/app/views/story_shares/_browse.html.erb b/app/views/story_shares/_browse.html.erb
index 58542bd380..0c58cfa2d2 100644
--- a/app/views/story_shares/_browse.html.erb
+++ b/app/views/story_shares/_browse.html.erb
@@ -42,7 +42,7 @@
             <% @lead_stories.each do |story| %>
               <div class="swiper-slide">
                 <%= link_to story_share_path(story), class: "block relative" do %>
-                  <%= render "story_image", story: story, aspect: StorySharesHelper::STORY_BANNER_ASPECT %>
+                  <%= render "story_image", story: story, aspect: StorySharesHelper::STORY_BANNER_ASPECT, video: true %>
                   <div class="from-brand-navy-950/85 absolute right-0 bottom-0 left-0 bg-gradient-to-t to-transparent p-6 text-white">
                     <h2 class="mb-1 font-display text-2xl"><%= story.title %></h2>
                     <p class="text-sm opacity-90">
diff --git a/app/views/story_shares/_home.html.erb b/app/views/story_shares/_home.html.erb
index e1a9912b8a..af9bcbdc2d 100644
--- a/app/views/story_shares/_home.html.erb
+++ b/app/views/story_shares/_home.html.erb
@@ -41,6 +41,7 @@
               <%= link_to story_share_path(story), class: "block relative" do %>
                 <div class="bg-brand-navy-100 relative overflow-hidden <%= StorySharesHelper::STORY_BANNER_ASPECT %>">
                   <%= render "assets/fitted_image", file: story.display_image, alt: story.title %>
+                  <%= render "story_shares/banner_video", story: story %>
                 </div>
                 <%= render "story_shares/primary_tag_pills", story: story, pad: "px-4 py-1.5",
                            wrapper_class: "absolute top-5 left-5 right-5 z-10" %>
diff --git a/app/views/story_shares/_story_image.html.erb b/app/views/story_shares/_story_image.html.erb
index 0b8a6109eb..e208103c38 100644
--- a/app/views/story_shares/_story_image.html.erb
+++ b/app/views/story_shares/_story_image.html.erb
@@ -1,12 +1,15 @@
 <%# Full-bleed story image with the primary-tag pills and a play badge for video stories.
-    Locals: story; aspect (default STORY_IMAGE_ASPECT); pills: false to omit the tag pills. %>
+    Locals: story; aspect (default STORY_IMAGE_ASPECT); pills: false to omit the tag pills;
+    video (plays the story's video over the image; banner aspect only). %>
 <% aspect = local_assigns.fetch(:aspect, StorySharesHelper::STORY_IMAGE_ASPECT) %>
+<% video = local_assigns[:video] && youtube_video_id(story.youtube_url) %>
 <div class="relative <%= aspect %> overflow-hidden bg-gray-200">
   <%= render "assets/fitted_image", file: story.display_image, alt: story.title, loading: "lazy" %>
+  <%= render "story_shares/banner_video", story: story if video %>
   <% if local_assigns.fetch(:pills, true) %>
     <%= render "story_shares/primary_tag_pills", story: story, wrapper_class: "absolute top-3 left-3 right-3" %>
   <% end %>
-  <% if story.youtube_url.present? %>
+  <% if story.youtube_url.present? && !video %>
     <div class="pointer-events-none absolute inset-0 flex items-center justify-center">
       <span class="flex h-14 w-14 items-center justify-center rounded-full bg-white/70">
         <i class="fa-solid fa-play ml-1 text-lg text-gray-800"></i>
diff --git a/app/views/story_shares/show.html.erb b/app/views/story_shares/show.html.erb
index d0d5fdecb3..814487f7ba 100644
--- a/app/views/story_shares/show.html.erb
+++ b/app/views/story_shares/show.html.erb
@@ -57,22 +57,15 @@
 
       <%= render "tag_chips", story: @story %>
 
-      <!-- Story images -->
-      <%= render "assets/display_assets_carousel", resource: @story %>
+      <!-- Story video + images -->
+      <%= render "assets/display_assets_carousel", resource: @story,
+                 video_url: youtube_embed_url(@story.youtube_url, js_api: true), video_title: "#{@story.title} video" %>
 
       <!-- Body -->
       <div class="mb-10 max-w-none prose prose-lg text-gray-700">
         <%= @story.rhino_body %>
       </div>
 
-      <!-- YouTube embed -->
-      <% if (embed_url = youtube_embed_url(@story.youtube_url)) %>
-        <div class="mb-10 aspect-video">
-          <iframe src="<%= embed_url %>" class="h-full w-full rounded-lg"
-                  title="<%= @story.title %> video" allowfullscreen loading="lazy"></iframe>
-        </div>
-      <% end %>
-
       <!-- Share -->
       <div class="mb-8 border-t border-gray-200 pt-6">
         <%= render "share_buttons", story: @story %>
diff --git a/db/seeds/dev/story_share_content.rb b/db/seeds/dev/story_share_content.rb
index 6d63a38a69..e685ab0089 100644
--- a/db/seeds/dev/story_share_content.rb
+++ b/db/seeds/dev/story_share_content.rb
@@ -119,9 +119,11 @@
 # publicly visible, the first five are publicly featured, sectors/audiences are
 # tagged (with ≥3 public stories in each featured sector), a few spotlight a
 # facilitator (for person profiles), and most get a primary image (last two
-# exercise the fallback).
+# exercise the fallback). Each story stars its first sector and audience as primary,
+# so the audience pages' carousels have highlights. The first story (id 1 on a fresh
+# DB) carries a video plus gallery images to exercise the story page carousel.
 story_seeds = [
-  { title: "Healing Through Art: A Survivor's Journey", sectors: [ "Domestic Violence" ], audiences: [ "Adults" ] },
+  { title: "Healing Through Art: A Survivor's Journey", sectors: [ "Domestic Violence" ], audiences: [ "Adults" ], youtube: true, gallery: true },
   { title: "Finding Strength in Creativity", sectors: [ "Domestic Violence", "Self-Care/Personal Growth" ], audiences: [ "Adults", "Families" ] },
   { title: "A Workshop Moment That Changed Everything", sectors: [ "Racial/Social Justice" ], audiences: [ "Teens" ] },
   { title: "From Silence to Expression", sectors: [ "Domestic Violence" ], audiences: [ "Adults" ] },
@@ -133,6 +135,18 @@
   { title: "When Art Opens a Door", sectors: [ "Grief/Loss" ], audiences: [ "Self" ], spotlight: true }
 ]
 story_images = %w[who-we-are-grid.jpg what-we-do.jpg ways-to-help.jpg our-next-chapter.jpg workshop_default.jpg]
+demo_video_url = "https://youtube.com/watch?v=dQw4w9WgXcQ"
+
+attach_primary_image = lambda do |story, filename|
+  asset = story.primary_asset
+  next if asset&.file&.attached?
+
+  image_path = Rails.root.join("app/assets/images", filename)
+  next unless File.exist?(image_path)
+  asset ||= story.assets.build(type: "PrimaryAsset")
+  asset.file.attach(io: File.open(image_path), filename: filename, content_type: "image/jpeg")
+  asset.save!
+end
 
 story_seeds.each_with_index do |seed, i|
   body_content = Faker::Lorem.paragraph(sentence_count: 10)
@@ -144,7 +158,7 @@
     story_workshops_attributes: [ { workshop_id: [ nil, Workshop.all.sample&.id ].sample } ],
     windows_type_id: WindowsType.all.sample&.id,
     spotlighted_facilitator_id: (Person.all.sample&.id if seed[:spotlight]),
-    youtube_url: (seed[:youtube] ? "https://youtube.com/watch?v=dQw4w9WgXcQ" : nil),
+    youtube_url: (demo_video_url if seed[:youtube]),
     created_by_id: User.first&.id,
     updated_by_id: User.first&.id,
     created_at: Time.current - (i * 7).days,
@@ -157,27 +171,29 @@
   story.update!(
     published: true, publicly_visible: true, publicly_featured: i < 5, featured: i < 5,
     spotlighted_facilitator_id: story.spotlighted_facilitator_id || (Person.all.sample&.id if seed[:spotlight]),
-    youtube_url: seed[:youtube] ? "https://youtube.com/watch?v=dQw4w9WgXcQ" : story.youtube_url
+    youtube_url: seed[:youtube] ? demo_video_url : story.youtube_url
   )
 
-  seed[:sectors].each do |name|
+  seed[:sectors].each_with_index do |name, position|
     sector = Sector.find_by(name: name) or next
-    story.sectorable_items.find_or_create_by!(sector: sector)
+    story.sectorable_items.find_or_initialize_by(sector: sector).update!(is_primary: position.zero?)
   end
-  seed[:audiences].each do |name|
+  seed[:audiences].each_with_index do |name, position|
     category = Category.where("LOWER(name) = LOWER(?)", name).first or next
-    story.categorizable_items.find_or_create_by!(category: category)
+    story.categorizable_items.find_or_initialize_by(category: category).update!(is_primary: position.zero?)
   end
 
   next if i >= story_images.length # last two stay image-less on purpose
-  asset = story.primary_asset
-  next if asset&.file&.attached?
+  attach_primary_image.call(story, story_images[i])
+  next unless seed[:gallery] && story.gallery_assets.none?
 
-  image_path = Rails.root.join("app/assets/images", story_images[i])
-  next unless File.exist?(image_path)
-  asset ||= story.assets.build(type: "PrimaryAsset")
-  asset.file.attach(io: File.open(image_path), filename: story_images[i], content_type: "image/jpeg")
-  asset.save!
+  story_images.excluding(story_images[i]).first(2).each do |filename|
+    image_path = Rails.root.join("app/assets/images", filename)
+    next unless File.exist?(image_path)
+    asset = story.assets.build(type: "GalleryAsset")
+    asset.file.attach(io: File.open(image_path), filename: filename, content_type: "image/jpeg")
+    asset.save!
+  end
 end
 
 # Bulk stories so the Story Share portal, admin index, pagination, and the sector/
@@ -216,8 +232,10 @@
 
   body_content = Faker::Lorem.paragraph(sentence_count: rand(6..14))
   has_spotlight = n % 9 == 0
-  has_youtube = n % 7 == 0
   is_public = n % 4 != 0
+  in_carousel = is_public && n < 6
+  # Odd carousel slides carry a video over their photo so the home carousel mixes both.
+  has_youtube = n % 7 == 0 || (in_carousel && n.odd?)
   is_featured = n % 11 == 0
   has_author = bulk_people.any? && n % 3 != 0
   created = Time.current - rand(1..900).days
@@ -231,7 +249,7 @@
     windows_type_id: bulk_windows_types.sample&.id,
     spotlighted_facilitator_id: (bulk_people.sample&.id if has_spotlight),
     author_id: (bulk_people.sample&.id if has_author),
-    youtube_url: (has_youtube ? "https://youtube.com/watch?v=dQw4w9WgXcQ" : nil),
+    youtube_url: (demo_video_url if has_youtube),
     created_by_id: seed_user&.id,
     updated_by_id: seed_user&.id,
     created_at: created,
@@ -240,8 +258,10 @@
     publicly_visible: is_public,
     publicly_featured: is_public && is_featured,
     featured: is_featured,
-    story_share_carousel_position: (n + 1 if is_public && n < 6)
+    story_share_carousel_position: (n + 1 if in_carousel)
   )
+  story.update!(youtube_url: demo_video_url) if has_youtube && story.youtube_url.blank?
+  attach_primary_image.call(story, story_images[n % story_images.length]) if in_carousel
 
   bulk_sectors.sample(rand(1..2)).each do |sector|
     story.sectorable_items.find_or_create_by!(sector: sector)
diff --git a/db/seeds/features/2026-10-22-story-videos-play-in-story-share-carousels.yml b/db/seeds/features/2026-10-22-story-videos-play-in-story-share-carousels.yml
new file mode 100644
index 0000000000..a1750f19c1
--- /dev/null
+++ b/db/seeds/features/2026-10-22-story-videos-play-in-story-share-carousels.yml
@@ -0,0 +1,13 @@
+name: "Story videos play in the Story Share carousels"
+area: stories
+display_status: public_facing
+released_on: 2026-10-22
+action_path: "/story_share"
+pr_number: 2789
+summary: >-
+  A story with a YouTube link now plays its video, muted and looping, in place of
+  its photo in the Story Share home and browse carousels. On the story itself, the
+  video leads the carousel at the top, followed by the story's images.
+pro_tips:
+  - "Clicking a carousel video opens the full story, where it plays with sound."
+  - "Paste a regular video link (youtube.com/watch?v=… or youtu.be/…); a channel link shows the photo instead."
diff --git a/spec/helpers/youtube_helper_spec.rb b/spec/helpers/youtube_helper_spec.rb
new file mode 100644
index 0000000000..a4ac8b2663
--- /dev/null
+++ b/spec/helpers/youtube_helper_spec.rb
@@ -0,0 +1,49 @@
+require "rails_helper"
+
+RSpec.describe YoutubeHelper, type: :helper do
+  describe "#youtube_video_id" do
+    it "reads the id from watch and short links" do
+      expect(helper.youtube_video_id("https://www.youtube.com/watch?v=abc123")).to eq("abc123")
+      expect(helper.youtube_video_id("https://youtu.be/abc123")).to eq("abc123")
+    end
+
+    it "is nil for a blank, unparseable, or id-less URL" do
+      expect(helper.youtube_video_id(nil)).to be_nil
+      expect(helper.youtube_video_id("not a url")).to be_nil
+      expect(helper.youtube_video_id("https://www.youtube.com/@awbworg")).to be_nil
+      expect(helper.youtube_video_id("https://youtu.be/")).to be_nil
+    end
+  end
+
+  describe "#youtube_embed_url" do
+    it "builds a plain embed URL" do
+      expect(helper.youtube_embed_url("https://youtu.be/abc123")).to eq("https://www.youtube.com/embed/abc123")
+    end
+
+    it "turns on the player's JS API when asked" do
+      expect(helper.youtube_embed_url("https://youtu.be/abc123", js_api: true)).to eq("https://www.youtube.com/embed/abc123?enablejsapi=1")
+    end
+  end
+
+  describe "#youtube_background_embed_url" do
+    it "builds a muted, looping, controls-free autoplay embed" do
+      url = helper.youtube_background_embed_url("https://www.youtube.com/watch?v=abc123")
+      uri = URI.parse(url)
+
+      expect("#{uri.host}#{uri.path}").to eq("www.youtube.com/embed/abc123")
+      expect(Rack::Utils.parse_query(uri.query)).to include(
+        "autoplay" => "1", "mute" => "1", "loop" => "1", "playlist" => "abc123", "controls" => "0", "playsinline" => "1"
+      )
+    end
+
+    it "keeps a crafted id from adding its own player params" do
+      url = helper.youtube_background_embed_url("https://www.youtube.com/watch?v=abc%26mute%3D0")
+
+      expect(Rack::Utils.parse_query(URI.parse(url).query)["mute"]).to eq("1")
+    end
+
+    it "is nil without a video id" do
+      expect(helper.youtube_background_embed_url("https://www.youtube.com/@awbworg")).to be_nil
+    end
+  end
+end
diff --git a/spec/requests/stories_spec.rb b/spec/requests/stories_spec.rb
index 53d35ca07a..93eb93eafc 100644
--- a/spec/requests/stories_spec.rb
+++ b/spec/requests/stories_spec.rb
@@ -349,6 +349,17 @@ def tag_primary(story, sector_name:, audience_name:)
         get story_url(private_story)
         expect(response).to have_http_status(:ok)
       end
+
+      it "leads the image carousel with the story's video" do
+        private_story.update!(youtube_url: "https://youtu.be/abc123")
+        create(:primary_asset, owner: private_story).file.attach(io: StringIO.new("image"), filename: "art.png", content_type: "image/png")
+
+        get story_url(private_story)
+
+        slides = Capybara.string(response.body).all("#hero-image .swiper-slide")
+        expect(slides.size).to eq(2)
+        expect(slides.first).to have_css("iframe[src='https://www.youtube.com/embed/abc123?enablejsapi=1']")
+      end
     end
 
     describe "GET /edit" do
diff --git a/spec/requests/story_share_spec.rb b/spec/requests/story_share_spec.rb
index ddd8ce504d..f12df74947 100644
--- a/spec/requests/story_share_spec.rb
+++ b/spec/requests/story_share_spec.rb
@@ -756,6 +756,91 @@ def carousel_slide(story)
     end
   end
 
+  # ==========================================================
+  # VIDEO STORIES IN CAROUSELS
+  # ==========================================================
+  describe "video stories in carousels" do
+    let(:video_url) { "https://www.youtube.com/watch?v=abc123" }
+    let(:player) { "iframe[src^='https://www.youtube.com/embed/abc123?'][src*='mute=1'][aria-hidden='true']" }
+
+    def carousel_slide(story)
+      Capybara.string(response.body).find(".swiper-slide", text: story.title)
+    end
+
+    it "plays a story's video muted in place of its image on the home carousel" do
+      video_story = create(:story, :published, :publicly_visible, title: "Video story", youtube_url: video_url, story_share_carousel_position: 1)
+      photo_story = create(:story, :published, :publicly_visible, title: "Photo story", story_share_carousel_position: 2)
+
+      get story_shares_path
+
+      expect(carousel_slide(video_story)).to have_css(player)
+      expect(carousel_slide(video_story)).to have_css("a[href='#{story_share_path(video_story)}'] #{player}")
+      expect(carousel_slide(photo_story)).to have_no_css("iframe")
+    end
+
+    it "plays a story's video in place of its play badge on the browse carousel" do
+      teens = create(:category, :published, name: "Teens", category_type: create(:category_type, name: "AgeRange"))
+      create(:story, :published, :publicly_visible, title: "Video story", youtube_url: video_url)
+        .categorizable_items.create!(category: teens, is_primary: true)
+      create(:story, :published, :publicly_visible, title: "Photo story", created_at: 1.day.ago)
+        .categorizable_items.create!(category: teens, is_primary: true)
+
+      get story_shares_path(category_names_all: "Teens")
+
+      slide = carousel_slide(Story.find_by(title: "Video story"))
+      expect(slide).to have_css(player)
+      expect(slide).to have_no_css(".fa-play")
+    end
+
+    it "keeps the play badge, not a player, on browse cards" do
+      sector = create(:sector, :published, name: "Homelessness", story_share_position: 1)
+      card_story = create(:story, :published, :publicly_visible, title: "Video card story", youtube_url: video_url, created_at: 2.days.ago)
+      lead = create(:story, :published, :publicly_visible, title: "Newer lead story")
+      [ card_story, lead ].each { |s| s.sectorable_items.create!(sector: sector, is_primary: true) }
+
+      get story_shares_path(sector_names_all: "Homelessness")
+
+      card = Capybara.string(response.body).find("article", text: "Video card story")
+      expect(card).to have_css(".fa-play")
+      expect(card).to have_no_css("iframe")
+    end
+
+    it "falls back to the image when the YouTube link has no video id" do
+      story = create(:story, :published, :publicly_visible, title: "Channel link story",
+                     youtube_url: "https://www.youtube.com/@awbworg", story_share_carousel_position: 1)
+
+      get story_shares_path
+
+      expect(carousel_slide(story)).to have_no_css("iframe")
+    end
+
+    it "leads the story page carousel with the video, then the story's images" do
+      story = create(:story, :published, :publicly_visible, youtube_url: video_url)
+      [ :primary_asset, :gallery_asset ].each do |factory|
+        create(factory, owner: story).file.attach(io: StringIO.new("image"), filename: "art.png", content_type: "image/png")
+      end
+
+      get story_share_path(story)
+
+      page = Capybara.string(response.body)
+      slides = page.all(".swiper-slide")
+      expect(slides.size).to eq(3)
+      expect(slides.first).to have_css("iframe[src='https://www.youtube.com/embed/abc123?enablejsapi=1'][data-carousel-target='video']")
+      expect(slides.drop(1)).to all(have_css("img"))
+      expect(page).to have_css("iframe", count: 1)
+    end
+
+    it "shows a video-only story as a single slide without arrows" do
+      story = create(:story, :published, :publicly_visible, youtube_url: video_url)
+
+      get story_share_path(story)
+
+      page = Capybara.string(response.body)
+      expect(page).to have_css(".swiper-slide iframe[src='https://www.youtube.com/embed/abc123?enablejsapi=1']")
+      expect(page).to have_no_css(".swiper-button-next-custom")
+    end
+  end
+
   # ==========================================================
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