citation

test.html

@@ -566,7 +566,19 @@
             })
           });
         }
-
+      document.addEventListener('DOMContentLoaded', () => {
+        const pre = document.getElementById('bibtex');
+        if (!pre) return;
+        pre.title = 'Click to select';
+        pre.tabIndex = 0;
+        pre.addEventListener('click', () => {
+          const range = document.createRange();
+          range.selectNodeContents(pre);
+          const sel = window.getSelection();
+          sel.removeAllRanges();
+          sel.addRange(range);
+        });
+      });
     </script>
   </body>
 </html>