I'm a bit unsure about this.  It's nice since it makes the full commit
message accessible in the briefs pages, and doesn't depend on javascript
(just a plain <details> tag.)  Most (all?) text browsers however don't
understand it and so this diffs adds some "noise" (the three dots) to
the briefs page.

I have this too on my instance:
<https://got.omarpolo.com/?action=summary&path=got.git>

(the aria-hidden attribute is just to make screen reader & co ignoring
the three dots that are only decorative.)

diff /home/op/w/got
commit - 227f81a40643e9c82bb019336421e17e914d015a
path + /home/op/w/got
blob - c6f473ced0d7b7454f210dfaa119b63cd96d2ba4
file + gotwebd/files/htdocs/gotwebd/gotweb.css
--- gotwebd/files/htdocs/gotwebd/gotweb.css
+++ gotwebd/files/htdocs/gotwebd/gotweb.css
@@ -213,6 +213,24 @@ header.subtitle h2 {
 	}
 }
 
+.briefs_log summary {
+	display: inline;
+	cursor: pointer;
+}
+
+.briefs_toggle {
+	display: inline-block;
+	padding: 3px 4px;
+	border: 1px solid #222;
+	border-radius: 3px;
+	user-select: none;
+}
+
+/* work around .commits being unusable here */
+.briefs_log > p {
+	white-space: pre-wrap;
+}
+
 .tag_age, .tag_name, .tag_log {
 	display: inline-block;
 	vertical-align: middle;
blob - 9e76331c9d3706b7909ec6ab013b194bc66801cc
file + gotwebd/pages.tmpl
--- gotwebd/pages.tmpl
+++ gotwebd/pages.tmpl
@@ -347,7 +347,7 @@ nextsep(char *s, char **t)
 	struct repo_commit	*rc;
 	struct repo_dir		*repo_dir = t->repo_dir;
 	struct gotweb_url	 diff_url, patch_url, tree_url;
-	char			*tmp;
+	char			*tmp, *body;
 
 	diff_url = (struct gotweb_url){
 		.action = DIFF,
@@ -385,9 +385,12 @@ nextsep(char *s, char **t)
 	if (tmp)
 		*tmp = '\0';
 
-	tmp = strchr(rc->commit_msg, '\n');
-	if (tmp)
-		*tmp = '\0';
+	body = strchr(rc->commit_msg, '\n');
+	if (body) {
+		*body++ = '\0';
+		while (*body == '\n')
+		      body++;
+	}
     !}
     <div class='brief'>
       <p class='brief_meta'>
@@ -399,15 +402,33 @@ nextsep(char *s, char **t)
           {{ rc->committer }}
         </span>
       </p>
-      <p class="briefs_log">
-        <a href="{{ render gotweb_render_url(tp->tp_arg, &diff_url) }}">
-          {{ rc->commit_msg }}
-        </a>
-        {{ if rc->refs_str }}
-          {{ " " }} <span class="refs_str">({{ rc->refs_str }})</span>
-        {{ end }}
-        </a>
-      </p>
+      {{ if body && *body != '\0' }}
+        <details class="briefs_log">
+          <summary>
+            <a href="{{ render gotweb_render_url(tp->tp_arg, &diff_url) }}">
+              {{ rc->commit_msg }}
+            </a>
+            {{ if rc->refs_str }}
+              {{ " " }} <span class="refs_str">({{ rc->refs_str }})</span>
+            {{ end }}
+            {{ " " }}
+            <span class="briefs_toggle" aria-hidden="true">
+              {{ " ⋅⋅⋅ " }}
+            </span>
+          </summary>
+          {{ "\n" }}
+          <p>{{ body }}</p>
+        </details>
+      {{ else }}
+        <p class="briefs_log">
+          <a href="{{ render gotweb_render_url(tp->tp_arg, &diff_url) }}">
+            {{ rc->commit_msg }}
+          </a>
+          {{ if rc->refs_str }}
+            {{ " " }} <span class="refs_str">({{ rc->refs_str }})</span>
+          {{ end }}
+        </p>
+      {{ end }}
     </div>
     <div class="navs_wrapper">
       <div class="navs">