1 files changed, 24 insertions, 0 deletions
diff --git a/ext/mixed/js/dom.js b/ext/mixed/js/dom.js
index 03acbb80..0e8f4462 100644
--- a/ext/mixed/js/dom.js
+++ b/ext/mixed/js/dom.js
@@ -62,4 +62,28 @@ class DOM {
             default: return false;
         }
     }
+
+    static getActiveModifiers(event) {
+        const modifiers = new Set();
+        if (event.altKey) { modifiers.add('alt'); }
+        if (event.ctrlKey) { modifiers.add('ctrl'); }
+        if (event.metaKey) { modifiers.add('meta'); }
+        if (event.shiftKey) { modifiers.add('shift'); }
+        return modifiers;
+    }
+
+    static getKeyFromEvent(event) {
+        const key = event.key;
+        return (typeof key === 'string' ? (key.length === 1 ? key.toUpperCase() : key) : '');
+    }
+
+    static getFullscreenElement() {
+        return (
+            document.fullscreenElement ||
+            document.msFullscreenElement ||
+            document.mozFullScreenElement ||
+            document.webkitFullscreenElement ||
+            null
+        );
+    }
 }