diff --git a/ext/bg/settings2.html b/ext/bg/settings2.html
index 700d4bd5..6f2f85fd 100644
--- a/ext/bg/settings2.html
+++ b/ext/bg/settings2.html
@@ -1883,7 +1883,7 @@
     <div class="profile-entry-cell"><label class="radio"><input type="radio" class="profile-entry-is-default-radio" name="profile-entry-default-radio"><span class="radio-body"><span class="radio-border"></span><span class="radio-dot"></span></span></label></div>
     <div class="profile-entry-cell"><input class="profile-entry-name-input" type="text" autocomplete="off" placeholder="Profile name"></div>
     <div class="profile-entry-cell"><a class="profile-entry-condition-count-link"><span class="profile-entry-condition-count">0</span></a></div>
-    <div class="profile-entry-cell input-height-icon-button-container"><button class="icon-button profile-entry-menu-button" data-menu="profile-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button></div>
+    <div class="profile-entry-cell input-height-icon-button-container"><button class="icon-button profile-entry-menu-button" data-menu="profile-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button></div>
 </div></template>
 
 <template id="profile-condition-group-template"><div class="profile-condition-group">
@@ -1908,7 +1908,7 @@
         </div>
     </div>
     <div class="profile-condition-menu-button-container input-height-icon-button-container">
-        <button class="icon-button profile-condition-menu-button" data-menu="profile-condition-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+        <button class="icon-button profile-condition-menu-button" data-menu="profile-condition-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
     </div>
 </div></template>
 
@@ -2053,7 +2053,7 @@
             </div>
         </div>
         <div class="settings-item-right">
-            <button class="icon-button dictionary-menu-button" data-menu="dictionary-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+            <button class="icon-button dictionary-menu-button" data-menu="dictionary-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
         </div>
     </div>
     <div class="settings-item-children">
@@ -2268,7 +2268,7 @@
         <option value="custom">Custom</option>
     </select>
     <div class="horizontal-flex-fill"></div>
-    <button class="icon-button audio-source-menu-button" data-menu="audio-source-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+    <button class="icon-button audio-source-menu-button" data-menu="audio-source-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
 </div></template>
 
 <template id="audio-source-menu-template"><div class="popup-menu-container" tabindex="-1" role="dialog"><div class="popup-menu">
@@ -2340,7 +2340,7 @@
         <div class="scan-input-index-cell generic-list-index-prefix"></div>
         <div class="scan-input-suffix-cell">
             <div class="input-height-icon-button-container">
-                <button class="icon-button scanning-input-menu-button" data-menu="scanning-inputs-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+                <button class="icon-button scanning-input-menu-button" data-menu="scanning-inputs-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
             </div>
         </div>
 
@@ -2673,7 +2673,7 @@
 <template id="anki-card-field-template"><div class="anki-card-field-name-container"><span class="anki-card-field-name"></span></div>
 <div class="anki-card-field-value-container">
     <input type="text" class="anki-card-field-value input-with-suffix-button" autocomplete="off">
-    <button class="anki-card-field-value-menu-button input-suffix-button input-suffix-icon-button" data-menu-position="below,left"><span class="icon icon-button-icon-light" data-icon="material-down-arrow"></span></button>
+    <button class="anki-card-field-value-menu-button input-suffix-button input-suffix-icon-button" data-menu-position="below left"><span class="icon icon-button-icon-light" data-icon="material-down-arrow"></span></button>
 </div></template>
 
 <template id="anki-card-terms-field-menu-template"><div class="popup-menu-container" tabindex="-1" role="dialog"><div class="popup-menu"></div></div></template>
@@ -2710,7 +2710,7 @@
                 <input type="text" id="anki-card-templates-test-text-input" class="form-control" value="読め" placeholder="Preview text" autocomplete="off">
                 <div class="anki-card-templates-test-input-container">
                     <input type="text" class="input-with-suffix-button" id="anki-card-templates-test-field-input" value="{expression}" placeholder="{marker}" autocomplete="off" spellcheck="false">
-                    <button class="input-suffix-button input-suffix-icon-button" id="anki-card-templates-test-field-menu-button" data-menu="anki-card-all-field-menu" data-menu-position="below,left"><span class="icon icon-button-icon-light" data-icon="material-down-arrow"></span></button>
+                    <button class="input-suffix-button input-suffix-icon-button" id="anki-card-templates-test-field-menu-button" data-menu="anki-card-all-field-menu" data-menu-position="below left"><span class="icon icon-button-icon-light" data-icon="material-down-arrow"></span></button>
                 </div>
                 <button id="anki-card-templates-test-render-button">Test</button>
             </div>
@@ -2859,7 +2859,7 @@
     <div class="translation-text-replacement-replacement-container">
         <input type="text" class="translation-text-replacement-replacement code">
     </div>
-    <button class="icon-button translation-text-replacement-button" data-menu="translation-text-replacement-entry-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+    <button class="icon-button translation-text-replacement-button" data-menu="translation-text-replacement-entry-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
 
     <div class="translation-text-replacement-test-label translation-text-replacement-test-node">Test Input:</div>
     <div class="translation-text-replacement-test-container translation-text-replacement-test-node">
@@ -2947,7 +2947,7 @@
         </div>
     </td>
     <td>
-        <button class="icon-button sentence-termination-character-entry-button" data-menu="sentence-termination-character-entry-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+        <button class="icon-button sentence-termination-character-entry-button" data-menu="sentence-termination-character-entry-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
     </td>
 </tr></template>
 
@@ -2985,7 +2985,7 @@
     <div class="hotkey-list-item-index-cell generic-list-index-prefix"></div>
     <div class="hotkey-list-item-button-cell">
         <div class="input-height-icon-button-container">
-            <button class="icon-button hotkey-list-item-button" data-menu="hotkey-list-item-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+            <button class="icon-button hotkey-list-item-button" data-menu="hotkey-list-item-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
         </div>
     </div>
 
diff --git a/ext/bg/welcome.html b/ext/bg/welcome.html
index a4a725be..cdc0c22c 100644
--- a/ext/bg/welcome.html
+++ b/ext/bg/welcome.html
@@ -322,7 +322,7 @@
             </div>
         </div>
         <div class="settings-item-right">
-            <button class="icon-button dictionary-menu-button" data-menu="dictionary-menu" data-menu-position="below,left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
+            <button class="icon-button dictionary-menu-button" data-menu="dictionary-menu" data-menu-position="below left"><span class="icon-button-inner"><span class="icon" data-icon="kebab-menu"></span></span></button>
         </div>
     </div>
 </div></template>
diff --git a/ext/mixed/js/popup-menu.js b/ext/mixed/js/popup-menu.js
index 5ae7435c..2e3f395d 100644
--- a/ext/mixed/js/popup-menu.js
+++ b/ext/mixed/js/popup-menu.js
@@ -92,7 +92,7 @@ class PopupMenu extends EventDispatcher {
         let verticalCover = 1;
         const positionInfo = this._sourceElement.dataset.menuPosition;
         if (typeof positionInfo === 'string') {
-            const positionInfoSet = new Set(positionInfo.split(','));
+            const positionInfoSet = new Set(positionInfo.split(' '));
 
             if (positionInfoSet.has('left')) {
                 horizontal = -1;