diff --git a/input.css b/input.css
--- a/input.css
+++ b/input.css
@@ -550,12 +550,17 @@
 }
 
 .line-quote-hl,
-.line-range-hl {
+.line-range-hl,
+.comment-hl {
     @apply !bg-yellow-200/30 dark:!bg-yellow-700/30;
 }
 
 .chunk-match-hl {
     @apply rounded-sm !bg-yellow-300/70 dark:!bg-yellow-600/60;
+}
+
+.comment-hl {
+    @apply rounded-md;
 }
 
 :is(.line-quote-hl, .line-range-hl) > .min-w-\[3\.5rem\] {
diff --git a/appview/pages/compose_parse_test.go b/appview/pages/compose_parse_test.go
--- a/appview/pages/compose_parse_test.go
+++ b/appview/pages/compose_parse_test.go
@@ -30,6 +30,9 @@
 		{"pullCompareForks", []string{"repo/pulls/fragments/pullCompareForks"}},
 		{"pullCompareBranches", []string{"repo/pulls/fragments/pullCompareBranches"}},
 		{"pullCompareForksBranches", []string{"repo/pulls/fragments/pullCompareForksBranches"}},
+		{"pull.html via repo base", []string{"layouts/base", "layouts/repobase", "repo/pulls/pull"}},
+		{"pullNewComment", []string{"repo/pulls/fragments/pullNewComment"}},
+		{"pullComment", []string{"fragments/comment/pullComment"}},
 	}
 
 	for _, c := range cases {
diff --git a/appview/pages/pages.go b/appview/pages/pages.go
--- a/appview/pages/pages.go
+++ b/appview/pages/pages.go
@@ -1877,6 +1877,18 @@
 	return p.executePlain("fragments/comment/commentBody", w, params)
 }
 
+type PullCommentFragmentParams struct {
+	LoggedInUser *oauth.MultiAccountUser
+	Comment      models.Comment
+	Reactions    map[models.ReactionKind]models.ReactionDisplayData
+	UserReacted  map[models.ReactionKind]bool
+	HxSwapOob    bool
+}
+
+func (p *Pages) PullCommentFragment(w io.Writer, params PullCommentFragmentParams) error {
+	return p.executePlain("fragments/comment/pullComment", w, params)
+}
+
 type CommentHeaderFragmentParams struct {
 	Comment     models.Comment
 	Reactions   map[models.ReactionKind]models.ReactionDisplayData
diff --git a/appview/state/comment.go b/appview/state/comment.go
--- a/appview/state/comment.go
+++ b/appview/state/comment.go
@@ -94,6 +94,18 @@
 	noticeId := "comment-error"
 	ctx := r.Context()
 
+	var pullRoundIdx *int
+	if pullRoundIdxRaw := r.FormValue("pull-round-idx"); pullRoundIdxRaw != "" {
+		roundIdx, err := strconv.Atoi(pullRoundIdxRaw)
+		if err != nil {
+			l.Warn("invalid round idx", "err", err)
+			s.pages.Notice(w, noticeId, "pull round index should be valid integer")
+			return
+		}
+		pullRoundIdx = &roundIdx
+		noticeId = fmt.Sprintf("comment-error-%d", roundIdx)
+	}
+
 	body := r.FormValue("body")
 	if body == "" {
 		s.pages.Notice(w, noticeId, "Body is required")
@@ -163,17 +175,6 @@
 	subject := comatproto.RepoStrongRef{
 		Uri: subjectUri.String(),
 		Cid: subjectCid.String(),
-	}
-
-	var pullRoundIdx *int
-	if pullRoundIdxRaw := r.FormValue("pull-round-idx"); pullRoundIdxRaw != "" {
-		roundIdx, err := strconv.Atoi(pullRoundIdxRaw)
-		if err != nil {
-			l.Warn("invalid round idx", "err", err)
-			s.pages.Notice(w, noticeId, "pull round index should be valid integer")
-			return
-		}
-		pullRoundIdx = &roundIdx
 	}
 
 	var replyTo *comatproto.RepoStrongRef
@@ -294,6 +295,21 @@
 	}
 
 	s.notifier.NewComment(ctx, &comment, mentions)
+
+	if pullRoundIdx != nil {
+		var buf bytes.Buffer
+		if err := s.pages.PullCommentFragment(&buf, pages.PullCommentFragmentParams{
+			LoggedInUser: user,
+			Comment:      comment,
+		}); err != nil {
+			l.Error("failed to render pull comment fragment", "err", err)
+			s.pages.HxRefresh(w)
+			return
+		}
+		w.Header().Set("Content-Type", "text/html")
+		w.Write(buf.Bytes())
+		return
+	}
 
 	// TODO: return comment or reply-comment fragment
 	// onattach, htmx-callback to focus on comment.
diff --git a/appview/pages/templates/fragments/line-quote-button.html b/appview/pages/templates/fragments/line-quote-button.html
--- a/appview/pages/templates/fragments/line-quote-button.html
+++ b/appview/pages/templates/fragments/line-quote-button.html
@@ -66,8 +66,10 @@
 
     const highlightFromHash = () => {
       clearHl('line-range-hl');
-      const hash = decodeURIComponent(window.location.hash.slice(1));
+      let hash;
+      try { hash = decodeURIComponent(window.location.hash.slice(1)); } catch (e) { return; }
       if (!hash) return;
+      if (hash.startsWith('comment-') || hash.startsWith('round-')) return;
       const parts = hash.split('~');
       const startEl = document.getElementById(parts[0]);
 
diff --git a/appview/pages/templates/fragments/comment/pullComment.html b/appview/pages/templates/fragments/comment/pullComment.html
new file mode 100644
--- /dev/null
+++ b/appview/pages/templates/fragments/comment/pullComment.html
@@ -0,0 +1,13 @@
+{{ define "fragments/comment/pullComment" }}
+<div class="flex gap-2 -ml-4 py-4 w-full mx-auto group/comment">
+  <!-- left column: profile picture -->
+  <div class="flex-shrink-0 h-fit relative">
+    {{ template "user/fragments/picLink" (list .Comment.Did.String "size-8") }}
+  </div>
+  <!-- right column: name and body in two rows -->
+  <div class="flex-1 min-w-0">
+    {{ template "fragments/comment/commentHeader" . }}
+    {{ template "fragments/comment/commentBody" . }}
+  </div>
+</div>
+{{ end }}
diff --git a/appview/pages/templates/repo/pulls/pull.html b/appview/pages/templates/repo/pulls/pull.html
--- a/appview/pages/templates/repo/pulls/pull.html
+++ b/appview/pages/templates/repo/pulls/pull.html
@@ -76,6 +76,38 @@
       }
     })();
   </script>
+  <script>
+    (function() {
+      const isPermalink = (id) => id.startsWith('comment-') || id.startsWith('round-');
+
+      const reveal = () => {
+        const raw = window.location.hash.slice(1);
+        if (!raw) return;
+        let id;
+        try { id = decodeURIComponent(raw); } catch (e) { return; }
+        if (!isPermalink(id)) return;
+        const target = document.getElementById(id);
+        if (!target) return;
+
+        for (let el = target.parentElement; el; el = el.parentElement) {
+          if (el.tagName === 'DETAILS') el.open = true;
+        }
+
+        requestAnimationFrame(() => requestAnimationFrame(() => {
+          target.scrollIntoView({ block: 'center' });
+          const card = target.closest('.group\\/comment') || target;
+          card.classList.add('comment-hl');
+        }));
+      };
+
+      if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', reveal);
+      } else {
+        reveal();
+      }
+      window.addEventListener('hashchange', reveal);
+    })();
+  </script>
 {{ end }}
 
 {{ define "repoContentLayout" }}
@@ -271,7 +303,7 @@
   {{ $lastIdx := index . 2 }}
   {{ $root := index . 3 }}
   {{ $round := $item.RoundNumber }}
-  <div class="
+  <div id="round-{{ $round }}" class="
     w-full shadow-sm  border overflow-clip
 
     {{ if eq $round 0 }}rounded-b{{ else }}rounded{{ end }}
@@ -362,14 +394,14 @@
         {{ else }}
         text-gray-500 dark:text-gray-400 hover:text-gray-500 dark:hover:text-gray-300
         {{ end }}
-        " href="#round-#{{ $round }}">
+        " href="#round-{{ $round }}">
         {{ template "repo/fragments/shortTime" $item.Created }}
       </a>
     </span>
     <div class="flex gap-2 items-center">
       {{ if or $root.IsInterdiff (ne $root.ActiveRound $round) }}
       <a class="btn-flat flex items-center gap-2 no-underline hover:no-underline text-sm"
-        href="/{{ $root.RepoInfo.FullName }}/pulls/{{ $root.Pull.PullId }}/round/{{ $round }}?{{ safeUrl $root.DiffOpts.Encode }}#round-#{{ $round }}">
+        href="/{{ $root.RepoInfo.FullName }}/pulls/{{ $root.Pull.PullId }}/round/{{ $round }}?{{ safeUrl $root.DiffOpts.Encode }}#round-{{ $round }}">
         {{ i "diff" "w-4 h-4" }}
         Diff
       </a>
@@ -544,14 +576,13 @@
         </span>
       </div>
     </summary>
-    <div>
+    <div id="pull-comments-{{ $round }}">
       {{ range $item.Comments }}
-        {{ template "comment"
-          (dict "LoggedInUser"      $root.LoggedInUser
-                "Reactions"         (index (asReactionMapMap $root.Reactions) .FeedCommentAtUri)
-                "UserReacted"       (index (asReactionStatusMapMap $root.UserReacted) .FeedCommentAtUri)
-                "VouchRelationship" (index $root.VouchRelationships .Did)
-                "Comment"           .) }}
+        {{ template "fragments/comment/pullComment"
+          (dict "LoggedInUser" $root.LoggedInUser
+                "Reactions"    (index (asReactionMapMap $root.Reactions) .FeedCommentAtUri)
+                "UserReacted"  (index (asReactionStatusMapMap $root.UserReacted) .FeedCommentAtUri)
+                "Comment"      .) }}
       {{ end }}
     </div>
     {{ if gt $c 0}}
@@ -584,20 +615,6 @@
           "Loading" (eq $lastIdx $item.RoundNumber)) }}
     </div>
   </details>
-{{ end }}
-
-{{ define "comment" }}
-<div class="flex gap-2 -ml-4 py-4 w-full mx-auto group/comment">
-  <!-- left column: profile picture -->
-  <div class="flex-shrink-0 h-fit relative">
-    {{ template "user/fragments/picLink" (list .Comment.Did.String "size-8") }}
-  </div>
-  <!-- right column: name and body in two rows -->
-  <div class="flex-1 min-w-0">
-    {{ template "fragments/comment/commentHeader" . }}
-    {{ template "fragments/comment/commentBody" . }}
-  </div>
-</div>
 {{ end }}
 
 {{ define "loginPrompt" }}
diff --git a/appview/pages/templates/repo/pulls/fragments/pullNewComment.html b/appview/pages/templates/repo/pulls/fragments/pullNewComment.html
--- a/appview/pages/templates/repo/pulls/fragments/pullNewComment.html
+++ b/appview/pages/templates/repo/pulls/fragments/pullNewComment.html
@@ -5,8 +5,10 @@
     class="w-full flex flex-wrap gap-2 group"
     hx-post="/comment"
     hx-trigger="submit, keydown[(ctrlKey || metaKey) && key=='Enter'] from:find textarea"
-    hx-swap="none"
+    hx-target="#pull-comments-{{ .RoundNumber }}"
+    hx-swap="beforeend"
     hx-disabled-elt="find button[type='submit']"
+    hx-on::before-request="this.querySelector('.error').innerHTML = ''"
     hx-on::after-request="if(event.detail.successful) this.reset()"
   >
     <input name="subject-uri" type="hidden" value="{{ .Pull.AtUri }}">
@@ -19,7 +21,7 @@
       placeholder="Add to the discussion..."></textarea
     >
     {{ template "replyActions" . }}
-    <div id="pull-comment"></div>
+    <div id="comment-error-{{ .RoundNumber }}" class="error"></div>
   </form>
 </div>
 {{ end }}