[feature/frontend] Respect `prefers-reduced-motion` for avatars, headers, and emojis (#3118)

* [feature/frontend] Respect `prefers-reduced-motion` for avatars, headers, and emojis

* go fmt

* fix tests

* use static version of instance thumbnail when appropriate

* use prefers-reduced-motion

* simplify account conversion a bit

* fix c&p error

docs/api/swagger.yaml

@@ -1526,6 +1526,16 @@ definitions:
                 example: picture of a cute lil' friendly sloth
                 type: string
                 x-go-name: ThumbnailDescription
+            thumbnail_static:
+                description: URL of the static instance avatar/banner image.
+                example: https://example.org/files/instance/static/thumbnail.webp
+                type: string
+                x-go-name: ThumbnailStatic
+            thumbnail_static_type:
+                description: MIME type of the static instance thumbnail.
+                example: image/webp
+                type: string
+                x-go-name: ThumbnailStaticType
             thumbnail_type:
                 description: MIME type of the instance thumbnail.
                 example: image/png
@@ -1759,6 +1769,11 @@ definitions:
                 example: UeKUpFxuo~R%0nW;WCnhF6RjaJt757oJodS$
                 type: string
                 x-go-name: Blurhash
+            static_url:
+                description: StaticURL version of the thumbnail image.
+                example: https://example.org/fileserver/01BPSX2MKCRVMD4YN4D71G9CP5/attachment/static/01H88X0KQ2DFYYDSWYP93VDJZA.webp
+                type: string
+                x-go-name: StaticURL
             thumbnail_description:
                 description: |-
                     Description of the instance thumbnail.
@@ -1766,6 +1781,13 @@ definitions:
                 example: picture of a cute lil' friendly sloth
                 type: string
                 x-go-name: Description
+            thumbnail_static_type:
+                description: |-
+                    MIME type of the instance thumbnail.
+                    Key/value not set if thumbnail image type unknown.
+                example: image/png
+                type: string
+                x-go-name: StaticType
             thumbnail_type:
                 description: |-
                     MIME type of the instance thumbnail.

internal/api/client/instance/instancepatch_test.go

@@ -762,6 +762,8 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
   },
   "thumbnail": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/original/`+instanceAccount.AvatarMediaAttachment.ID+`.gif",`+`
   "thumbnail_type": "image/gif",
+  "thumbnail_static": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/small/`+instanceAccount.AvatarMediaAttachment.ID+`.webp",`+`
+  "thumbnail_static_type": "image/webp",
   "thumbnail_description": "A bouncing little green peglin.",
   "contact_account": {
     "id": "01F8MH17FWEB39HZJ76B6VXSKF",
@@ -818,6 +820,8 @@ func (suite *InstancePatchTestSuite) TestInstancePatch8() {
 	suite.Equal(`{
   "url": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/original/`+instanceAccount.AvatarMediaAttachment.ID+`.gif",`+`
   "thumbnail_type": "image/gif",
+  "static_url": "http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/attachment/small/`+instanceAccount.AvatarMediaAttachment.ID+`.webp",`+`
+  "thumbnail_static_type": "image/webp",
   "thumbnail_description": "A bouncing little green peglin.",
   "blurhash": "LE9kG#M}4YtO%dRkWEt5Dmoxx?WC"
 }`, string(instanceV2ThumbnailJson))

internal/api/model/account.go

@@ -110,17 +110,27 @@ type Account struct {
 	// If set, indicates that this account is currently inactive, and has migrated to the given account.
 	// Key/value omitted for accounts that haven't moved, and for suspended accounts.
 	Moved *Account `json:"moved,omitempty"`
+}
 
-	// Additional fields not exposed via JSON
+// WebAccount is like Account, but with
-	// (used only internally for templating etc).
+// additional fields not exposed via JSON;
+// used only internally for templating etc.
+//
+// swagger:ignore
+type WebAccount struct {
+	*Account
 
 	// Proper attachment model for the avatar.
 	//
-	// Only set if this model was converted via
+	// Only set if this account had an avatar set
-	// AccountToWebAccount, AND this account had
+	// (and not just the default "blank" image.)
-	// an avatar set (and not just the default
+	AvatarAttachment *WebAttachment `json:"-"`
-	// "blank" avatar image.)
+
-	AvatarAttachment *Attachment `json:"-"`
+	// Proper attachment model for the header.
+	//
+	// Only set if this account had a header set
+	// (and not just the default "blank" image.)
+	HeaderAttachment *WebAttachment `json:"-"`
 }
 
 // MutedAccount extends Account with a field used only by the muted user list.

internal/api/model/attachment.go

@@ -107,6 +107,10 @@ type WebAttachment struct {
 	// MIME type of
 	// the attachment.
 	MIMEType string
+
+	// MIME type of
+	// the thumbnail.
+	PreviewMIMEType string
 }
 
 // MediaMeta models media metadata.

internal/api/model/instancev1.go

@@ -85,6 +85,12 @@ type InstanceV1 struct {
 	// MIME type of the instance thumbnail.
 	// example: image/png
 	ThumbnailType string `json:"thumbnail_type,omitempty"`
+	// URL of the static instance avatar/banner image.
+	// example: https://example.org/files/instance/static/thumbnail.webp
+	ThumbnailStatic string `json:"thumbnail_static,omitempty"`
+	// MIME type of the static instance thumbnail.
+	// example: image/webp
+	ThumbnailStaticType string `json:"thumbnail_static_type,omitempty"`
 	// Description of the instance thumbnail.
 	// example: picture of a cute lil' friendly sloth
 	ThumbnailDescription string `json:"thumbnail_description,omitempty"`

internal/api/model/instancev2.go

@@ -102,6 +102,13 @@ type InstanceV2Thumbnail struct {
 	// Key/value not set if thumbnail image type unknown.
 	// example: image/png
 	Type string `json:"thumbnail_type,omitempty"`
+	// StaticURL version of the thumbnail image.
+	// example: https://example.org/fileserver/01BPSX2MKCRVMD4YN4D71G9CP5/attachment/static/01H88X0KQ2DFYYDSWYP93VDJZA.webp
+	StaticURL string `json:"static_url,omitempty"`
+	// MIME type of the instance thumbnail.
+	// Key/value not set if thumbnail image type unknown.
+	// example: image/png
+	StaticType string `json:"thumbnail_static_type,omitempty"`
 	// Description of the instance thumbnail.
 	// Key/value not set if no description available.
 	// example: picture of a cute lil' friendly sloth

internal/api/model/status.go

@@ -113,6 +113,9 @@ type Status struct {
 type WebStatus struct {
 	*Status
 
+	// Override API account with web account.
+	Account *WebAccount `json:"account"`
+
 	// Web version of media
 	// attached to this status.
 	MediaAttachments []*WebAttachment `json:"media_attachments"`

internal/api/util/opengraph.go

@@ -84,7 +84,7 @@ func OGBase(instance *apimodel.InstanceV1) *OGMeta {
 // WithAccount uses the given account to build an ogMeta
 // struct specific to that account. It's suitable for serving
 // at account profile pages.
-func (og *OGMeta) WithAccount(account *apimodel.Account) *OGMeta {
+func (og *OGMeta) WithAccount(account *apimodel.WebAccount) *OGMeta {
 	og.Title = AccountTitle(account, og.SiteName)
 	og.Type = "profile"
 	og.URL = account.URL
@@ -148,7 +148,7 @@ func (og *OGMeta) WithStatus(status *apimodel.WebStatus) *OGMeta {
 }
 
 // AccountTitle parses a page title from account and accountDomain
-func AccountTitle(account *apimodel.Account, accountDomain string) string {
+func AccountTitle(account *apimodel.WebAccount, accountDomain string) string {
 	user := "@" + account.Acct + "@" + accountDomain
 
 	if len(account.DisplayName) == 0 {

internal/api/util/opengraph_test.go

@@ -51,13 +51,15 @@ func (suite *OpenGraphTestSuite) TestWithAccountWithNote() {
 		Languages:     []string{"en"},
 	})
 
-	accountMeta := baseMeta.WithAccount(&apimodel.Account{
+	acct := &apimodel.Account{
 		Acct:        "example_account",
 		DisplayName: "example person!!",
 		URL:         "https://example.org/@example_account",
 		Note:        "<p>This is my profile, read it and weep! Weep then!</p>",
 		Username:    "example_account",
-	})
+	}
+
+	accountMeta := baseMeta.WithAccount(&apimodel.WebAccount{Account: acct})
 
 	suite.EqualValues(OGMeta{
 		Title:                "example person!!, @example_account@example.org",
@@ -84,13 +86,15 @@ func (suite *OpenGraphTestSuite) TestWithAccountNoNote() {
 		Languages:     []string{"en"},
 	})
 
-	accountMeta := baseMeta.WithAccount(&apimodel.Account{
+	acct := &apimodel.Account{
 		Acct:        "example_account",
 		DisplayName: "example person!!",
 		URL:         "https://example.org/@example_account",
 		Note:        "", // <- empty
 		Username:    "example_account",
-	})
+	}
+
+	accountMeta := baseMeta.WithAccount(&apimodel.WebAccount{Account: acct})
 
 	suite.EqualValues(OGMeta{
 		Title:                "example person!!, @example_account@example.org",

internal/processing/account/get.go

@@ -98,7 +98,7 @@ func (p *Processor) Get(ctx context.Context, requestingAccount *gtsmodel.Account
 }
 
 // GetWeb returns the web model of a local account by username.
-func (p *Processor) GetWeb(ctx context.Context, username string) (*apimodel.Account, gtserror.WithCode) {
+func (p *Processor) GetWeb(ctx context.Context, username string) (*apimodel.WebAccount, gtserror.WithCode) {
 	targetAccount, err := p.state.DB.GetAccountByUsernameDomain(ctx, username, "")
 	if err != nil {
 		if errors.Is(err, db.ErrNoEntries) {

internal/processing/account/rss_test.go

@@ -35,7 +35,36 @@ func (suite *GetRSSTestSuite) TestGetAccountRSSAdmin() {
 
 	feed, err := getFeed()
 	suite.NoError(err)
-	suite.Equal("<?xml version=\"1.0\" encoding=\"UTF-8\"?><rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n  <channel>\n    <title>Posts from @admin@localhost:8080</title>\n    <link>http://localhost:8080/@admin</link>\n    <description>Posts from @admin@localhost:8080</description>\n    <pubDate>Wed, 20 Oct 2021 10:41:37 +0000</pubDate>\n    <lastBuildDate>Wed, 20 Oct 2021 10:41:37 +0000</lastBuildDate>\n    <item>\n      <title>open to see some puppies</title>\n      <link>http://localhost:8080/@admin/statuses/01F8MHAAY43M6RJ473VQFCVH37</link>\n      <description>@admin@localhost:8080 made a new post: &#34;🐕🐕🐕🐕🐕&#34;</description>\n      <content:encoded><![CDATA[🐕🐕🐕🐕🐕]]></content:encoded>\n      <author>@admin@localhost:8080</author>\n      <guid isPermaLink=\"true\">http://localhost:8080/@admin/statuses/01F8MHAAY43M6RJ473VQFCVH37</guid>\n      <pubDate>Wed, 20 Oct 2021 12:36:45 +0000</pubDate>\n      <source>http://localhost:8080/@admin/feed.rss</source>\n    </item>\n    <item>\n      <title>hello world! #welcome ! first post on the instance :rainbow: !</title>\n      <link>http://localhost:8080/@admin/statuses/01F8MH75CBF9JFX4ZAD54N0W0R</link>\n      <description>@admin@localhost:8080 posted 1 attachment: &#34;hello world! #welcome ! first post on the instance :rainbow: !&#34;</description>\n      <content:encoded><![CDATA[hello world! #welcome ! first post on the instance <img src=\"http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/emoji/original/01F8MH9H8E4VG3KDYJR9EGPXCQ.png\" title=\":rainbow:\" alt=\":rainbow:\" width=\"25\" height=\"25\"/> !]]></content:encoded>\n      <author>@admin@localhost:8080</author>\n      <enclosure url=\"http://localhost:8080/fileserver/01F8MH17FWEB39HZJ76B6VXSKF/attachment/original/01F8MH6NEM8D7527KZAECTCR76.jpg\" length=\"62529\" type=\"image/jpeg\"></enclosure>\n      <guid isPermaLink=\"true\">http://localhost:8080/@admin/statuses/01F8MH75CBF9JFX4ZAD54N0W0R</guid>\n      <pubDate>Wed, 20 Oct 2021 11:36:45 +0000</pubDate>\n      <source>http://localhost:8080/@admin/feed.rss</source>\n    </item>\n  </channel>\n</rss>", feed)
+	suite.Equal(`<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
+  <channel>
+    <title>Posts from @admin@localhost:8080</title>
+    <link>http://localhost:8080/@admin</link>
+    <description>Posts from @admin@localhost:8080</description>
+    <pubDate>Wed, 20 Oct 2021 10:41:37 +0000</pubDate>
+    <lastBuildDate>Wed, 20 Oct 2021 10:41:37 +0000</lastBuildDate>
+    <item>
+      <title>open to see some puppies</title>
+      <link>http://localhost:8080/@admin/statuses/01F8MHAAY43M6RJ473VQFCVH37</link>
+      <description>@admin@localhost:8080 made a new post: &#34;🐕🐕🐕🐕🐕&#34;</description>
+      <content:encoded><![CDATA[🐕🐕🐕🐕🐕]]></content:encoded>
+      <author>@admin@localhost:8080</author>
+      <guid isPermaLink="true">http://localhost:8080/@admin/statuses/01F8MHAAY43M6RJ473VQFCVH37</guid>
+      <pubDate>Wed, 20 Oct 2021 12:36:45 +0000</pubDate>
+      <source>http://localhost:8080/@admin/feed.rss</source>
+    </item>
+    <item>
+      <title>hello world! #welcome ! first post on the instance :rainbow: !</title>
+      <link>http://localhost:8080/@admin/statuses/01F8MH75CBF9JFX4ZAD54N0W0R</link>
+      <description>@admin@localhost:8080 posted 1 attachment: &#34;hello world! #welcome ! first post on the instance :rainbow: !&#34;</description>
+      <content:encoded><![CDATA[hello world! #welcome ! first post on the instance <img src="http://localhost:8080/fileserver/01AY6P665V14JJR0AFVRT7311Y/emoji/original/01F8MH9H8E4VG3KDYJR9EGPXCQ.png" title=":rainbow:" alt=":rainbow:" width="25" height="25" /> !]]></content:encoded>
+      <author>@admin@localhost:8080</author>
+      <enclosure url="http://localhost:8080/fileserver/01F8MH17FWEB39HZJ76B6VXSKF/attachment/original/01F8MH6NEM8D7527KZAECTCR76.jpg" length="62529" type="image/jpeg"></enclosure>
+      <guid isPermaLink="true">http://localhost:8080/@admin/statuses/01F8MH75CBF9JFX4ZAD54N0W0R</guid>
+      <pubDate>Wed, 20 Oct 2021 11:36:45 +0000</pubDate>
+      <source>http://localhost:8080/@admin/feed.rss</source>
+    </item>
+  </channel>
+</rss>`, feed)
 }
 
 func (suite *GetRSSTestSuite) TestGetAccountRSSZork() {
@@ -45,7 +74,75 @@ func (suite *GetRSSTestSuite) TestGetAccountRSSZork() {
 
 	feed, err := getFeed()
 	suite.NoError(err)
-	suite.Equal("<?xml version=\"1.0\" encoding=\"UTF-8\"?><rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n  <channel>\n    <title>Posts from @the_mighty_zork@localhost:8080</title>\n    <link>http://localhost:8080/@the_mighty_zork</link>\n    <description>Posts from @the_mighty_zork@localhost:8080</description>\n    <pubDate>Wed, 10 Jan 2024 09:24:00 +0000</pubDate>\n    <lastBuildDate>Wed, 10 Jan 2024 09:24:00 +0000</lastBuildDate>\n    <image>\n      <url>http://localhost:8080/fileserver/01F8MH1H7YV1Z7D2C8K2730QBF/avatar/small/01F8MH58A357CV5K7R7TJMSH6S.webp</url>\n      <title>Avatar for @the_mighty_zork@localhost:8080</title>\n      <link>http://localhost:8080/@the_mighty_zork</link>\n    </image>\n    <item>\n      <title>HTML in post</title>\n      <link>http://localhost:8080/@the_mighty_zork/statuses/01HH9KYNQPA416TNJ53NSATP40</link>\n      <description>@the_mighty_zork@localhost:8080 made a new post: &#34;Here&#39;s a bunch of HTML, read it and weep, weep then!&#xA;&#xA;```html&#xA;&lt;section class=&#34;about-user&#34;&gt;&#xA; &lt;div class=&#34;col-header&#34;&gt;&#xA; &lt;h2&gt;About&lt;/h2&gt;&#xA; &lt;/div&gt; &#xA; &lt;div class=&#34;fields&#34;&gt;&#xA; &lt;h3 class=&#34;sr-only&#34;&gt;Fields&lt;/h3&gt;&#xA; &lt;dl&gt;&#xA;...</description>\n      <content:encoded><![CDATA[<p>Here's a bunch of HTML, read it and weep, weep then!</p><pre><code class=\"language-html\">&lt;section class=&#34;about-user&#34;&gt;\n    &lt;div class=&#34;col-header&#34;&gt;\n        &lt;h2&gt;About&lt;/h2&gt;\n    &lt;/div&gt;            \n    &lt;div class=&#34;fields&#34;&gt;\n        &lt;h3 class=&#34;sr-only&#34;&gt;Fields&lt;/h3&gt;\n        &lt;dl&gt;\n            &lt;div class=&#34;field&#34;&gt;\n                &lt;dt&gt;should you follow me?&lt;/dt&gt;\n                &lt;dd&gt;maybe!&lt;/dd&gt;\n            &lt;/div&gt;\n            &lt;div class=&#34;field&#34;&gt;\n                &lt;dt&gt;age&lt;/dt&gt;\n                &lt;dd&gt;120&lt;/dd&gt;\n            &lt;/div&gt;\n        &lt;/dl&gt;\n    &lt;/div&gt;\n    &lt;div class=&#34;bio&#34;&gt;\n        &lt;h3 class=&#34;sr-only&#34;&gt;Bio&lt;/h3&gt;\n        &lt;p&gt;i post about things that concern me&lt;/p&gt;\n    &lt;/div&gt;\n    &lt;div class=&#34;sr-only&#34; role=&#34;group&#34;&gt;\n        &lt;h3 class=&#34;sr-only&#34;&gt;Stats&lt;/h3&gt;\n        &lt;span&gt;Joined in Jun, 2022.&lt;/span&gt;\n        &lt;span&gt;8 posts.&lt;/span&gt;\n        &lt;span&gt;Followed by 1.&lt;/span&gt;\n        &lt;span&gt;Following 1.&lt;/span&gt;\n    &lt;/div&gt;\n    &lt;div class=&#34;accountstats&#34; aria-hidden=&#34;true&#34;&gt;\n        &lt;b&gt;Joined&lt;/b&gt;&lt;time datetime=&#34;2022-06-04T13:12:00.000Z&#34;&gt;Jun, 2022&lt;/time&gt;\n        &lt;b&gt;Posts&lt;/b&gt;&lt;span&gt;8&lt;/span&gt;\n        &lt;b&gt;Followed by&lt;/b&gt;&lt;span&gt;1&lt;/span&gt;\n        &lt;b&gt;Following&lt;/b&gt;&lt;span&gt;1&lt;/span&gt;\n    &lt;/div&gt;\n&lt;/section&gt;\n</code></pre><p>There, hope you liked that!</p>]]></content:encoded>\n      <author>@the_mighty_zork@localhost:8080</author>\n      <guid isPermaLink=\"true\">http://localhost:8080/@the_mighty_zork/statuses/01HH9KYNQPA416TNJ53NSATP40</guid>\n      <pubDate>Sun, 10 Dec 2023 09:24:00 +0000</pubDate>\n      <source>http://localhost:8080/@the_mighty_zork/feed.rss</source>\n    </item>\n    <item>\n      <title>introduction post</title>\n      <link>http://localhost:8080/@the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY</link>\n      <description>@the_mighty_zork@localhost:8080 made a new post: &#34;hello everyone!&#34;</description>\n      <content:encoded><![CDATA[hello everyone!]]></content:encoded>\n      <author>@the_mighty_zork@localhost:8080</author>\n      <guid isPermaLink=\"true\">http://localhost:8080/@the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY</guid>\n      <pubDate>Wed, 20 Oct 2021 10:40:37 +0000</pubDate>\n      <source>http://localhost:8080/@the_mighty_zork/feed.rss</source>\n    </item>\n  </channel>\n</rss>", feed)
+	suite.Equal(`<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
+  <channel>
+    <title>Posts from @the_mighty_zork@localhost:8080</title>
+    <link>http://localhost:8080/@the_mighty_zork</link>
+    <description>Posts from @the_mighty_zork@localhost:8080</description>
+    <pubDate>Wed, 10 Jan 2024 09:24:00 +0000</pubDate>
+    <lastBuildDate>Wed, 10 Jan 2024 09:24:00 +0000</lastBuildDate>
+    <image>
+      <url>http://localhost:8080/fileserver/01F8MH1H7YV1Z7D2C8K2730QBF/avatar/small/01F8MH58A357CV5K7R7TJMSH6S.webp</url>
+      <title>Avatar for @the_mighty_zork@localhost:8080</title>
+      <link>http://localhost:8080/@the_mighty_zork</link>
+    </image>
+    <item>
+      <title>HTML in post</title>
+      <link>http://localhost:8080/@the_mighty_zork/statuses/01HH9KYNQPA416TNJ53NSATP40</link>
+      <description>@the_mighty_zork@localhost:8080 made a new post: &#34;Here&#39;s a bunch of HTML, read it and weep, weep then!&#xA;&#xA;`+"```"+`html&#xA;&lt;section class=&#34;about-user&#34;&gt;&#xA; &lt;div class=&#34;col-header&#34;&gt;&#xA; &lt;h2&gt;About&lt;/h2&gt;&#xA; &lt;/div&gt; &#xA; &lt;div class=&#34;fields&#34;&gt;&#xA; &lt;h3 class=&#34;sr-only&#34;&gt;Fields&lt;/h3&gt;&#xA; &lt;dl&gt;&#xA;...</description>
+      <content:encoded><![CDATA[<p>Here's a bunch of HTML, read it and weep, weep then!</p><pre><code class="language-html">&lt;section class=&#34;about-user&#34;&gt;
+    &lt;div class=&#34;col-header&#34;&gt;
+        &lt;h2&gt;About&lt;/h2&gt;
+    &lt;/div&gt;            
+    &lt;div class=&#34;fields&#34;&gt;
+        &lt;h3 class=&#34;sr-only&#34;&gt;Fields&lt;/h3&gt;
+        &lt;dl&gt;
+            &lt;div class=&#34;field&#34;&gt;
+                &lt;dt&gt;should you follow me?&lt;/dt&gt;
+                &lt;dd&gt;maybe!&lt;/dd&gt;
+            &lt;/div&gt;
+            &lt;div class=&#34;field&#34;&gt;
+                &lt;dt&gt;age&lt;/dt&gt;
+                &lt;dd&gt;120&lt;/dd&gt;
+            &lt;/div&gt;
+        &lt;/dl&gt;
+    &lt;/div&gt;
+    &lt;div class=&#34;bio&#34;&gt;
+        &lt;h3 class=&#34;sr-only&#34;&gt;Bio&lt;/h3&gt;
+        &lt;p&gt;i post about things that concern me&lt;/p&gt;
+    &lt;/div&gt;
+    &lt;div class=&#34;sr-only&#34; role=&#34;group&#34;&gt;
+        &lt;h3 class=&#34;sr-only&#34;&gt;Stats&lt;/h3&gt;
+        &lt;span&gt;Joined in Jun, 2022.&lt;/span&gt;
+        &lt;span&gt;8 posts.&lt;/span&gt;
+        &lt;span&gt;Followed by 1.&lt;/span&gt;
+        &lt;span&gt;Following 1.&lt;/span&gt;
+    &lt;/div&gt;
+    &lt;div class=&#34;accountstats&#34; aria-hidden=&#34;true&#34;&gt;
+        &lt;b&gt;Joined&lt;/b&gt;&lt;time datetime=&#34;2022-06-04T13:12:00.000Z&#34;&gt;Jun, 2022&lt;/time&gt;
+        &lt;b&gt;Posts&lt;/b&gt;&lt;span&gt;8&lt;/span&gt;
+        &lt;b&gt;Followed by&lt;/b&gt;&lt;span&gt;1&lt;/span&gt;
+        &lt;b&gt;Following&lt;/b&gt;&lt;span&gt;1&lt;/span&gt;
+    &lt;/div&gt;
+&lt;/section&gt;
+</code></pre><p>There, hope you liked that!</p>]]></content:encoded>
+      <author>@the_mighty_zork@localhost:8080</author>
+      <guid isPermaLink="true">http://localhost:8080/@the_mighty_zork/statuses/01HH9KYNQPA416TNJ53NSATP40</guid>
+      <pubDate>Sun, 10 Dec 2023 09:24:00 +0000</pubDate>
+      <source>http://localhost:8080/@the_mighty_zork/feed.rss</source>
+    </item>
+    <item>
+      <title>introduction post</title>
+      <link>http://localhost:8080/@the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY</link>
+      <description>@the_mighty_zork@localhost:8080 made a new post: &#34;hello everyone!&#34;</description>
+      <content:encoded><![CDATA[hello everyone!]]></content:encoded>
+      <author>@the_mighty_zork@localhost:8080</author>
+      <guid isPermaLink="true">http://localhost:8080/@the_mighty_zork/statuses/01F8MHAMCHF6Y650WCRSCP4WMY</guid>
+      <pubDate>Wed, 20 Oct 2021 10:40:37 +0000</pubDate>
+      <source>http://localhost:8080/@the_mighty_zork/feed.rss</source>
+    </item>
+  </channel>
+</rss>`, feed)
 }
 
 func (suite *GetRSSTestSuite) TestGetAccountRSSZorkNoPosts() {
@@ -70,7 +167,20 @@ func (suite *GetRSSTestSuite) TestGetAccountRSSZorkNoPosts() {
 
 	feed, err := getFeed()
 	suite.NoError(err)
-	suite.Equal("<?xml version=\"1.0\" encoding=\"UTF-8\"?><rss version=\"2.0\" xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">\n  <channel>\n    <title>Posts from @the_mighty_zork@localhost:8080</title>\n    <link>http://localhost:8080/@the_mighty_zork</link>\n    <description>Posts from @the_mighty_zork@localhost:8080</description>\n    <pubDate>Fri, 20 May 2022 11:09:18 +0000</pubDate>\n    <lastBuildDate>Fri, 20 May 2022 11:09:18 +0000</lastBuildDate>\n    <image>\n      <url>http://localhost:8080/fileserver/01F8MH1H7YV1Z7D2C8K2730QBF/avatar/small/01F8MH58A357CV5K7R7TJMSH6S.webp</url>\n      <title>Avatar for @the_mighty_zork@localhost:8080</title>\n      <link>http://localhost:8080/@the_mighty_zork</link>\n    </image>\n  </channel>\n</rss>", feed)
+	suite.Equal(`<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
+  <channel>
+    <title>Posts from @the_mighty_zork@localhost:8080</title>
+    <link>http://localhost:8080/@the_mighty_zork</link>
+    <description>Posts from @the_mighty_zork@localhost:8080</description>
+    <pubDate>Fri, 20 May 2022 11:09:18 +0000</pubDate>
+    <lastBuildDate>Fri, 20 May 2022 11:09:18 +0000</lastBuildDate>
+    <image>
+      <url>http://localhost:8080/fileserver/01F8MH1H7YV1Z7D2C8K2730QBF/avatar/small/01F8MH58A357CV5K7R7TJMSH6S.webp</url>
+      <title>Avatar for @the_mighty_zork@localhost:8080</title>
+      <link>http://localhost:8080/@the_mighty_zork</link>
+    </image>
+  </channel>
+</rss>`, feed)
 }
 
 func TestGetRSSTestSuite(t *testing.T) {

internal/text/emojify.go

@@ -32,20 +32,44 @@ func EmojifyWeb(emojis []apimodel.Emoji, html template.HTML) template.HTML {
 	out := emojify(
 		emojis,
 		string(html),
-		func(url, code string, buf *bytes.Buffer) {
+		func(url, staticURL, code string, buf *bytes.Buffer) {
-			buf.WriteString(`<img src="`)
+			// Open a picture tag so we
-			buf.WriteString(url)
+			// can present multiple options.
-			buf.WriteString(`" title=":`)
+			buf.WriteString(`<picture>`)
-			buf.WriteString(code)
+
-			buf.WriteString(`:" alt=":`)
+			// Static version.
-			buf.WriteString(code)
+			buf.WriteString(`<source `)
-			buf.WriteString(`:" class="emoji" `)
+			{
+				buf.WriteString(`class="emoji" `)
+				buf.WriteString(`srcset="` + staticURL + `" `)
+				buf.WriteString(`type="image/png" `)
+				// Show this version when user
+				// doesn't want an animated emoji.
+				buf.WriteString(`media="(prefers-reduced-motion: reduce)" `)
+				// Limit size to avoid showing
+				// huge emojis when unstyled.
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
+
+			// Original image source.
+			buf.WriteString(`<img `)
+			{
+				buf.WriteString(`class="emoji" `)
+				buf.WriteString(`src="` + url + `" `)
+				buf.WriteString(`title=":` + code + `:" `)
+				buf.WriteString(`alt=":` + code + `:" `)
 				// Lazy load emojis when
 				// they scroll into view.
 				buf.WriteString(`loading="lazy" `)
 				// Limit size to avoid showing
 				// huge emojis when unstyled.
-			buf.WriteString(`width="25" height="25"/>`)
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
+
+			// Close the picture tag.
+			buf.WriteString(`</picture>`)
 		},
 	)
 
@@ -60,17 +84,18 @@ func EmojifyRSS(emojis []apimodel.Emoji, text string) string {
 	return emojify(
 		emojis,
 		text,
-		func(url, code string, buf *bytes.Buffer) {
+		func(url, staticURL, code string, buf *bytes.Buffer) {
-			buf.WriteString(`<img src="`)
+			// Original image source.
-			buf.WriteString(url)
+			buf.WriteString(`<img `)
-			buf.WriteString(`" title=":`)
+			{
-			buf.WriteString(code)
+				buf.WriteString(`src="` + url + `" `)
-			buf.WriteString(`:" alt=":`)
+				buf.WriteString(`title=":` + code + `:" `)
-			buf.WriteString(code)
+				buf.WriteString(`alt=":` + code + `:" `)
-			buf.WriteString(`:" `)
 				// Limit size to avoid showing
 				// huge emojis in RSS readers.
-			buf.WriteString(`width="25" height="25"/>`)
+				buf.WriteString(`width="25" height="25" `)
+			}
+			buf.WriteString(`/>`)
 		},
 	)
 }
@@ -85,7 +110,7 @@ func Demojify(text string) string {
 func emojify(
 	emojis []apimodel.Emoji,
 	input string,
-	write func(url, code string, buf *bytes.Buffer),
+	write func(url, staticURL, code string, buf *bytes.Buffer),
 ) string {
 	// Build map of shortcodes. Normalize each
 	// shortcode by readding closing colons.
@@ -107,10 +132,11 @@ func emojify(
 
 			// Escape raw emoji content.
 			url := html.EscapeString(emoji.URL)
+			staticURL := html.EscapeString(emoji.StaticURL)
 			code := html.EscapeString(emoji.Shortcode)
 
 			// Write emoji repr to buffer.
-			write(url, code, buf)
+			write(url, staticURL, code, buf)
 			return buf.String()
 		},
 	)

internal/typeutils/internaltofrontend.go

@@ -170,22 +170,47 @@ func (c *Converter) AccountToAPIAccountPublic(ctx context.Context, a *gtsmodel.A
 func (c *Converter) AccountToWebAccount(
 	ctx context.Context,
 	a *gtsmodel.Account,
-) (*apimodel.Account, error) {
+) (*apimodel.WebAccount, error) {
-	webAccount, err := c.AccountToAPIAccountPublic(ctx, a)
+	apiAccount, err := c.AccountToAPIAccountPublic(ctx, a)
 	if err != nil {
 		return nil, err
 	}
 
+	webAccount := &apimodel.WebAccount{
+		Account: apiAccount,
+	}
+
 	// Set additional avatar information for
-	// serving the avatar in a nice photobox.
+	// serving the avatar in a nice <picture>.
-	if a.AvatarMediaAttachment != nil {
+	if ogAvi := a.AvatarMediaAttachment; ogAvi != nil {
-		avatarAttachment, err := c.AttachmentToAPIAttachment(ctx, a.AvatarMediaAttachment)
+		avatarAttachment, err := c.AttachmentToAPIAttachment(ctx, ogAvi)
 		if err != nil {
 			// This is just extra data so just
 			// log but don't return any error.
 			log.Errorf(ctx, "error converting account avatar attachment: %v", err)
 		} else {
-			webAccount.AvatarAttachment = &avatarAttachment
+			webAccount.AvatarAttachment = &apimodel.WebAttachment{
+				Attachment:      &avatarAttachment,
+				MIMEType:        ogAvi.File.ContentType,
+				PreviewMIMEType: ogAvi.Thumbnail.ContentType,
+			}
+		}
+	}
+
+	// Set additional header information for
+	// serving the header in a nice <picture>.
+	if ogHeader := a.HeaderMediaAttachment; ogHeader != nil {
+		headerAttachment, err := c.AttachmentToAPIAttachment(ctx, ogHeader)
+		if err != nil {
+			// This is just extra data so just
+			// log but don't return any error.
+			log.Errorf(ctx, "error converting account header attachment: %v", err)
+		} else {
+			webAccount.HeaderAttachment = &apimodel.WebAttachment{
+				Attachment:      &headerAttachment,
+				MIMEType:        ogHeader.File.ContentType,
+				PreviewMIMEType: ogHeader.Thumbnail.ContentType,
+			}
 		}
 	}
 
@@ -747,11 +772,35 @@ func (c *Converter) StatusToAPIStatus(
 	filters []*gtsmodel.Filter,
 	mutes *usermute.CompiledUserMuteList,
 ) (*apimodel.Status, error) {
-	apiStatus, err := c.statusToFrontend(ctx, s, requestingAccount, filterContext, filters, mutes)
+	apiStatus, err := c.statusToFrontend(
+		ctx,
+		s,
+		requestingAccount, // Can be nil.
+		filterContext,     // Can be empty.
+		filters,
+		mutes,
+	)
 	if err != nil {
 		return nil, err
 	}
 
+	// Convert author to API model.
+	acct, err := c.AccountToAPIAccountPublic(ctx, s.Account)
+	if err != nil {
+		return nil, gtserror.Newf("error converting status acct: %w", err)
+	}
+	apiStatus.Account = acct
+
+	// Convert author of boosted
+	// status (if set) to API model.
+	if apiStatus.Reblog != nil {
+		boostAcct, err := c.AccountToAPIAccountPublic(ctx, s.BoostOfAccount)
+		if err != nil {
+			return nil, gtserror.Newf("error converting boost acct: %w", err)
+		}
+		apiStatus.Reblog.Account = boostAcct
+	}
+
 	// Normalize status for API by pruning
 	// attachments that were not locally
 	// stored, replacing them with a helpful
@@ -958,11 +1007,9 @@ func (c *Converter) StatusToWebStatus(
 	ctx context.Context,
 	s *gtsmodel.Status,
 ) (*apimodel.WebStatus, error) {
-	apiStatus, err := c.statusToFrontend(
+	apiStatus, err := c.statusToFrontend(ctx, s,
-		ctx,
-		s,
 		nil,                            // No authed requester.
-		statusfilter.FilterContextNone,
+		statusfilter.FilterContextNone, // No filters.
 		nil,                            // No filters.
 		nil,                            // No mutes.
 	)
@@ -970,8 +1017,15 @@ func (c *Converter) StatusToWebStatus(
 		return nil, err
 	}
 
+	// Convert status author to web model.
+	acct, err := c.AccountToWebAccount(ctx, s.Account)
+	if err != nil {
+		return nil, err
+	}
+
 	webStatus := &apimodel.WebStatus{
 		Status:  apiStatus,
+		Account: acct,
 	}
 
 	// Whack a newline before and after each "pre" to make it easier to outdent it.
@@ -1065,6 +1119,7 @@ func (c *Converter) StatusToWebStatus(
 			Attachment:      apiAttachment,
 			Sensitive:       apiStatus.Sensitive,
 			MIMEType:        ogAttachment.File.ContentType,
+			PreviewMIMEType: ogAttachment.Thumbnail.ContentType,
 		}
 	}
 
@@ -1090,6 +1145,9 @@ func (c *Converter) StatusToAPIStatusSource(ctx context.Context, s *gtsmodel.Sta
 // parsing a status into its initial frontend representation.
 //
 // Requesting account can be nil.
+//
+// This function also doesn't handle converting the
+// account to api/web model -- the caller must do that.
 func (c *Converter) statusToFrontend(
 	ctx context.Context,
 	status *gtsmodel.Status,
@@ -1142,6 +1200,9 @@ func (c *Converter) statusToFrontend(
 // baseStatusToFrontend performs the main logic
 // of statusToFrontend() without handling of boost
 // logic, to prevent *possible* recursion issues.
+//
+// This function also doesn't handle converting the
+// account to api/web model -- the caller must do that.
 func (c *Converter) baseStatusToFrontend(
 	ctx context.Context,
 	s *gtsmodel.Status,
@@ -1169,11 +1230,6 @@ func (c *Converter) baseStatusToFrontend(
 		}
 	}
 
-	apiAuthorAccount, err := c.AccountToAPIAccountPublic(ctx, s.Account)
-	if err != nil {
-		return nil, gtserror.Newf("error converting status author: %w", err)
-	}
-
 	repliesCount, err := c.state.DB.CountStatusReplies(ctx, s.ID)
 	if err != nil {
 		return nil, gtserror.Newf("error counting replies: %w", err)
@@ -1240,7 +1296,7 @@ func (c *Converter) baseStatusToFrontend(
 		Content:            s.Content,
 		Reblog:             nil, // Set below.
 		Application:        nil, // Set below.
-		Account:            apiAuthorAccount,
+		Account:            nil, // Caller must do this.
 		MediaAttachments:   apiAttachments,
 		Mentions:           apiMentions,
 		Tags:               apiTags,
@@ -1464,6 +1520,8 @@ func (c *Converter) InstanceToAPIV1Instance(ctx context.Context, i *gtsmodel.Ins
 
 		instance.Thumbnail = iAccount.AvatarMediaAttachment.URL
 		instance.ThumbnailType = iAccount.AvatarMediaAttachment.File.ContentType
+		instance.ThumbnailStatic = iAccount.AvatarMediaAttachment.Thumbnail.URL
+		instance.ThumbnailStaticType = iAccount.AvatarMediaAttachment.Thumbnail.ContentType
 		instance.ThumbnailDescription = iAccount.AvatarMediaAttachment.Description
 	} else {
 		instance.Thumbnail = config.GetProtocol() + "://" + i.Domain + "/assets/logo.webp" // default thumb
@@ -1533,6 +1591,8 @@ func (c *Converter) InstanceToAPIV2Instance(ctx context.Context, i *gtsmodel.Ins
 
 		thumbnail.URL = iAccount.AvatarMediaAttachment.URL
 		thumbnail.Type = iAccount.AvatarMediaAttachment.File.ContentType
+		thumbnail.StaticURL = iAccount.AvatarMediaAttachment.Thumbnail.URL
+		thumbnail.StaticType = iAccount.AvatarMediaAttachment.Thumbnail.ContentType
 		thumbnail.Description = iAccount.AvatarMediaAttachment.Description
 		thumbnail.Blurhash = iAccount.AvatarMediaAttachment.Blurhash
 	} else {

internal/typeutils/internaltofrontend_test.go

@@ -981,28 +981,6 @@ func (suite *InternalToFrontendTestSuite) TestStatusToWebStatus() {
   "pinned": false,
   "content": "\u003cp\u003ehi \u003cspan class=\"h-card\"\u003e\u003ca href=\"http://localhost:8080/@admin\" class=\"u-url mention\" rel=\"nofollow noreferrer noopener\" target=\"_blank\"\u003e@\u003cspan\u003eadmin\u003c/span\u003e\u003c/a\u003e\u003c/span\u003e here's some media for ya\u003c/p\u003e",
   "reblog": null,
-  "account": {
-    "id": "01FHMQX3GAABWSM0S2VZEC2SWC",
-    "username": "Some_User",
-    "acct": "Some_User@example.org",
-    "display_name": "some user",
-    "locked": true,
-    "discoverable": true,
-    "bot": false,
-    "created_at": "2020-08-10T12:13:28.000Z",
-    "note": "i'm a real son of a gun",
-    "url": "http://example.org/@Some_User",
-    "avatar": "",
-    "avatar_static": "",
-    "header": "http://localhost:8080/assets/default_header.webp",
-    "header_static": "http://localhost:8080/assets/default_header.webp",
-    "followers_count": 0,
-    "following_count": 0,
-    "statuses_count": 1,
-    "last_status_at": "2023-11-02T10:44:25.000Z",
-    "emojis": [],
-    "fields": []
-  },
   "mentions": [
     {
       "id": "01F8MH17FWEB39HZJ76B6VXSKF",
@@ -1035,6 +1013,28 @@ func (suite *InternalToFrontendTestSuite) TestStatusToWebStatus() {
       "with_approval": []
     }
   },
+  "account": {
+    "id": "01FHMQX3GAABWSM0S2VZEC2SWC",
+    "username": "Some_User",
+    "acct": "Some_User@example.org",
+    "display_name": "some user",
+    "locked": true,
+    "discoverable": true,
+    "bot": false,
+    "created_at": "2020-08-10T12:13:28.000Z",
+    "note": "i'm a real son of a gun",
+    "url": "http://example.org/@Some_User",
+    "avatar": "",
+    "avatar_static": "",
+    "header": "http://localhost:8080/assets/default_header.webp",
+    "header_static": "http://localhost:8080/assets/default_header.webp",
+    "followers_count": 0,
+    "following_count": 0,
+    "statuses_count": 1,
+    "last_status_at": "2023-11-02T10:44:25.000Z",
+    "emojis": [],
+    "fields": []
+  },
   "media_attachments": [
     {
       "id": "01HE7Y3C432WRSNS10EZM86SA5",
@@ -1065,7 +1065,8 @@ func (suite *InternalToFrontendTestSuite) TestStatusToWebStatus() {
       "description": "Photograph of a sloth, Public Domain.",
       "blurhash": "LKE3VIw}0KD%a2o{M|t7NFWps:t7",
       "Sensitive": true,
-      "MIMEType": "image/jpg"
+      "MIMEType": "image/jpg",
+      "PreviewMIMEType": "image/webp"
     },
     {
       "id": "01HE7ZFX9GKA5ZZVD4FACABSS9",
@@ -1079,7 +1080,8 @@ func (suite *InternalToFrontendTestSuite) TestStatusToWebStatus() {
       "description": "SVG line art of a sloth, public domain",
       "blurhash": "L26*j+~qE1RP?wxut7ofRlM{R*of",
       "Sensitive": true,
-      "MIMEType": ""
+      "MIMEType": "",
+      "PreviewMIMEType": ""
     },
     {
       "id": "01HE88YG74PVAB81PX2XA9F3FG",
@@ -1093,7 +1095,8 @@ func (suite *InternalToFrontendTestSuite) TestStatusToWebStatus() {
       "description": "Jolly salsa song, public domain.",
       "blurhash": null,
       "Sensitive": true,
-      "MIMEType": ""
+      "MIMEType": "",
+      "PreviewMIMEType": ""
     }
   ],
   "LanguageTag": "en",

internal/web/thread.go

@@ -108,7 +108,7 @@ func (m *Module) threadGETHandler(c *gin.Context) {
 	}
 
 	// Ensure status actually belongs to target account.
-	if context.Status.GetAccountID() != targetAccount.ID {
+	if context.Status.Account.ID != targetAccount.ID {
 		err := fmt.Errorf("target account %s does not own status %s", targetUsername, targetStatusID)
 		apiutil.WebErrorHandler(c, gtserror.NewErrorNotFound(err), instanceGet)
 		return

web/source/css/base.css

@@ -187,12 +187,13 @@ input, select, textarea, .input {
 	margin: -0.2em 0.02em 0;
 	object-fit: contain;
 	vertical-align: middle;
-	transition: 0.1s;
 	
+	@media (prefers-reduced-motion: no-preference) {
 		/*
 			Enlarge emojis on hover to give
 			viewer a good look at them.
 		*/
+		transition: 0.1s;
 		&:hover, &:active {
 			transform: scale(2);
 			background-color: $bg;
@@ -201,6 +202,7 @@ input, select, textarea, .input {
 			border-radius: $br-inner;
 		}
 	}
+}
 
 /*
 	Restyle unordered lists; outdent

web/source/css/index.css

@@ -30,7 +30,8 @@
 			line-height: 2rem;
 		}
 
-		& > img {
+		img,
+		picture {
 			align-self: center;
 			max-height: 6rem;
 		}

web/source/css/page.css

@@ -48,7 +48,8 @@
 		gap: 1rem;
 		justify-content: center;
 
-		img {
+		img,
+		picture {
 			align-self: center;
 			
 			/*

web/source/css/status.css

@@ -193,14 +193,6 @@ main {
 				font-size: 1rem;
 				line-height: initial;
 			}
-
-			img {
-				max-width: 100%;
-				margin: 5px auto;
-			}
-			img[alt~="!center"] {
-				display: block;
-			}
 		}
 
 		.poll {

web/template/page.tmpl

@@ -29,7 +29,7 @@
 {{- if .instance.ThumbnailType -}}
 {{- .instance.ThumbnailType -}}
 {{- else -}}
-image/png
+image/webp
 {{- end -}}
 {{- end -}}
 

web/template/page_header.tmpl

@@ -57,11 +57,20 @@ Instance Logo
 
 {{- with . }}
 <a aria-label="{{- .instance.Title -}}. Go to instance homepage" href="/" class="nounderline">
+    <picture>
+        {{- if .instance.ThumbnailStatic }}
+        <source
+            srcset="{{- .instance.ThumbnailStatic -}}"
+            type="{{- .instance.ThumbnailStaticType -}}"
+            media="(prefers-reduced-motion: reduce)"
+        />
+        {{- end }}
         <img
             src="{{- .instance.Thumbnail -}}"
             alt="{{- template "thumbnailDescription" . -}}"
             title="{{- template "thumbnailDescription" . -}}"
         />
+    </picture>
     <h1>{{- .instance.Title -}}</h1>
 </a>
 {{- if .showStrap }}

web/template/profile.tmpl

@@ -94,6 +94,17 @@
         alt="{{- template "avatarAlt" . -}}"
         title="{{- template "avatarAlt" . -}}"
     >
+        <picture
+            aria-hidden="true"
+        >
+            {{- if .account.AvatarAttachment }}
+            <source
+                class="avatar"
+                srcset="{{- .account.AvatarStatic -}}"
+                type="{{- .account.AvatarAttachment.PreviewMIMEType -}}"
+                media="(prefers-reduced-motion: reduce)"
+            />
+            {{- end }}
             <img
                 class="avatar"
                 src="{{- .account.Avatar -}}"
@@ -102,6 +113,7 @@
                 width="{{- template "avatarWidth" . -}}"
                 height="{{- template "avatarHeight" . -}}"
             />
+        </picture>
     </a>
 </div>
 {{- end }}
@@ -115,11 +127,20 @@
         {{- include "profileMovedTo" . | indent 2 }}
         {{- end }}
         <div class="header-image-wrapper">
+            <picture>
+                {{- if .account.HeaderAttachment }}
+                <source
+                    srcset="{{- .account.HeaderStatic -}}"
+                    type="{{- .account.HeaderAttachment.PreviewMIMEType -}}"
+                    media="(prefers-reduced-motion: reduce)"
+                />
+                {{- end }}
                 <img
                     src="{{- .account.Header -}}"
                     alt="{{- template "headerAlt" . -}}"
                     title="{{- template "headerAlt" . -}}"
                 />
+            </picture>
         </div>
         <div class="basic-info">
             {{- with . }}

web/template/status_header.tmpl

@@ -32,13 +32,23 @@
         title="Open remote profile (opens in a new window)"
     >
     {{- end }}
-        <img
+        <picture
             class="avatar"
             aria-hidden="true"
+        >
+            {{- if .AvatarAttachment }}
+            <source
+                srcset="{{- .AvatarStatic -}}"
+                type="{{- .AvatarAttachment.PreviewMIMEType -}}"
+                media="(prefers-reduced-motion: reduce)"
+            />
+            {{- end }}
+            <img
                 src="{{- .Avatar -}}"
                 alt="Avatar for {{ .Username -}}"
                 title="Avatar for {{ .Username -}}"
             >
+        </picture>
         <div class="author-strap">
             <span class="displayname text-cutoff">
                 {{- if .DisplayName -}}