diff --git a/app/javascript/mastodon/features/emoji/emoji.js b/app/javascript/mastodon/features/emoji/emoji.js
index bc3dd8c60..6ae406624 100644
--- a/app/javascript/mastodon/features/emoji/emoji.js
+++ b/app/javascript/mastodon/features/emoji/emoji.js
@@ -50,7 +50,7 @@ const emojifyTextNode = (node, customEmojis) => {
         if (shortname in customEmojis) {
           const filename = autoPlayGif ? customEmojis[shortname].url : customEmojis[shortname].static_url;
           replacement = document.createElement('img');
-          replacement.setAttribute('draggable', false);
+          replacement.setAttribute('draggable', 'false');
           replacement.setAttribute('class', 'emojione custom-emoji');
           replacement.setAttribute('alt', shortname);
           replacement.setAttribute('title', shortname);
@@ -65,7 +65,7 @@ const emojifyTextNode = (node, customEmojis) => {
       const { filename, shortCode } = unicodeMapping[match];
       const title = shortCode ? `:${shortCode}:` : '';
       replacement = document.createElement('img');
-      replacement.setAttribute('draggable', false);
+      replacement.setAttribute('draggable', 'false');
       replacement.setAttribute('class', 'emojione');
       replacement.setAttribute('alt', match);
       replacement.setAttribute('title', title);
diff --git a/app/javascript/packs/public.jsx b/app/javascript/packs/public.jsx
index a5e2014f7..3db6c5c6a 100644
--- a/app/javascript/packs/public.jsx
+++ b/app/javascript/packs/public.jsx
@@ -291,10 +291,10 @@ function main() {
 
     if (sidebar.classList.contains('visible')) {
       document.body.style.overflow = null;
-      toggleButton.setAttribute('aria-expanded', false);
+      toggleButton.setAttribute('aria-expanded', 'false');
     } else {
       document.body.style.overflow = 'hidden';
-      toggleButton.setAttribute('aria-expanded', true);
+      toggleButton.setAttribute('aria-expanded', 'true');
     }
 
     toggleButton.classList.toggle('active');