<p></p>
<p><b>@AntonKhorev</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4894#discussion_r1660331516">app/assets/javascripts/richtext.js</a>:</p>
<pre style='color:#555'>> +  /*
+   * Install a click handler to return 'required' attribute for
+   * message_title (Subject) when send button is pressed.
+   */
+  $(".btn-primary[id=\"send_message_button_id\"]").click(function () {
+    var messageTitleElement = document.getElementById("message_title");
+    if (messageTitleElement) {
+      messageTitleElement.setAttribute("required", "required");
+    }
+  });
+
+  /*
+   * Install a click handler to return 'required' attribute to
+   * diary_entry_title (Subject) element, .. when publish / update
+   * button is pressed.
+   */
+  $(".btn-primary[id=\"publish_or_update_diary_entry_button_id\"]").click(function () {
+    var diaryEntryTitleElement = document.getElementById("diary_entry_title");
+    if (diaryEntryTitleElement) {
+      diaryEntryTitleElement.setAttribute("required", "required");
+    }
+  });
+
</pre>
<p dir="auto">None of this is required for what you're trying to do.</p>

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