diff --git a/changelogs/internal/newsfragments/1881.clarification b/changelogs/internal/newsfragments/1881.clarification
new file mode 100644
index 00000000..d698545f
--- /dev/null
+++ b/changelogs/internal/newsfragments/1881.clarification
@@ -0,0 +1 @@
+Ensure most generated HTML IDs are unique.
diff --git a/content/client-server-api/modules/end_to_end_encryption.md b/content/client-server-api/modules/end_to_end_encryption.md
index 5787205a..49b053f6 100644
--- a/content/client-server-api/modules/end_to_end_encryption.md
+++ b/content/client-server-api/modules/end_to_end_encryption.md
@@ -1349,7 +1349,7 @@ the following format:
 The `session_data` field in the backups is constructed as follows:
 
 1.  Encode the session key to be backed up as a JSON object using the
-    `SessionData` format defined below.
+    `BackedUpSessionData` format defined below.
 
 2.  Generate an ephemeral curve25519 key, and perform an ECDH with the
     ephemeral key and the backup's public key to generate a shared
@@ -1427,7 +1427,7 @@ user-supplied passphrase, and is created as follows:
 
 ###### Key export format
 
-The exported sessions are formatted as a JSON array of `SessionData`
+The exported sessions are formatted as a JSON array of `ExportedSessionData`
 objects described as follows:
 
 {{% definition path="api/client-server/definitions/megolm_export_session_data" %}}
diff --git a/data/api/client-server/definitions/key_backup_session_data.yaml b/data/api/client-server/definitions/key_backup_session_data.yaml
index 18963cbe..bc61bb30 100644
--- a/data/api/client-server/definitions/key_backup_session_data.yaml
+++ b/data/api/client-server/definitions/key_backup_session_data.yaml
@@ -14,7 +14,7 @@
 
 
 type: object
-title: SessionData
+title: BackedUpSessionData
 description: |-
   The format of a backed-up session key, prior to encryption, when using the
   `m.megolm_backup.v1.curve25519-aes-sha2` algorithm.
diff --git a/data/api/client-server/definitions/megolm_export_session_data.yaml b/data/api/client-server/definitions/megolm_export_session_data.yaml
index 8c1e5010..f5d1e409 100644
--- a/data/api/client-server/definitions/megolm_export_session_data.yaml
+++ b/data/api/client-server/definitions/megolm_export_session_data.yaml
@@ -16,6 +16,7 @@
 allOf:
   - $ref: key_backup_session_data.yaml
   - type: object
+    title: ExportedSessionData
     description: |-
       The format used to encode a Megolm session key for export.
 
diff --git a/layouts/partials/openapi/render-operation.html b/layouts/partials/openapi/render-operation.html
index ef525353..13e7128c 100644
--- a/layouts/partials/openapi/render-operation.html
+++ b/layouts/partials/openapi/render-operation.html
@@ -20,14 +20,14 @@
 {{ $method := .method }}
 {{ $endpoint := .endpoint }}
 {{ $operation_data := .operation_data }}
-{{ $anchor := anchorize $endpoint }}
+{{ $anchor := printf "%s%s" (lower $method) (anchorize $endpoint) }}
 
 <section class="rendered-data http-api {{ $method }}">
 
 <details {{ if not site.Params.ui.rendered_data_collapsed }}open{{ end }}>
 <summary>
 
-  <h1 id="{{ lower $method }}{{ $anchor }}">
+  <h1 id="{{ $anchor }}">
    <span class="http-api-method {{ $method }}">{{ $method }}</span>
    <span class="endpoint{{ if $operation_data.deprecated }} deprecated-inline{{ end }}">{{ $endpoint }}</span>
   </h1>
diff --git a/layouts/partials/openapi/render-request.html b/layouts/partials/openapi/render-request.html
index 92811f12..80b352c6 100644
--- a/layouts/partials/openapi/render-request.html
+++ b/layouts/partials/openapi/render-request.html
@@ -16,6 +16,7 @@
 {{ $parameters := .parameters }}
 {{ $request_body := .request_body }}
 {{ $anchor_base := .anchor_base }}
+{{ $anchor := printf "%s_request" $anchor_base }}
 
 <h2>Request</h2>
 
@@ -42,7 +43,7 @@
             */}}
             {{ $schema := $json_body.schema }}
 
-            {{ $additional_types := partial "json-schema/resolve-additional-types" (dict "schema" $schema "anchor_base" $anchor_base) }}
+            {{ $additional_types := partial "json-schema/resolve-additional-types" (dict "schema" $schema "anchor_base" $anchor) }}
             {{ range $additional_types }}
                 {{ partial "openapi/render-object-table" . }}
             {{ end }}
diff --git a/layouts/partials/openapi/render-responses.html b/layouts/partials/openapi/render-responses.html
index f26110b4..084e9481 100644
--- a/layouts/partials/openapi/render-responses.html
+++ b/layouts/partials/openapi/render-responses.html
@@ -39,6 +39,7 @@
 
 {{ range $code, $response := $responses }}
     {{ if $response.content }}
+        {{ $anchor := printf "%s_response-%s" $anchor_base $code }}
 <h3>{{$code}} response</h3>
         {{/* Display defined headers */}}
         {{ if $response.headers }}
@@ -97,7 +98,7 @@
             response. (This will be a no-op for response types which aren't
             objects or arrays.)
             */}}
-            {{ $additional_types := partial "json-schema/resolve-additional-types" (dict "schema" $schema "anchor_base" $anchor_base) }}
+            {{ $additional_types := partial "json-schema/resolve-additional-types" (dict "schema" $schema "anchor_base" $anchor) }}
             {{ range $additional_types }}
                 {{ partial "openapi/render-object-table" . }}
             {{ end }}