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diff --git a/vendor/oojs/oojs-ui/src/widgets/PopupButtonWidget.js b/vendor/oojs/oojs-ui/src/widgets/PopupButtonWidget.js
new file mode 100644
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+++ b/vendor/oojs/oojs-ui/src/widgets/PopupButtonWidget.js
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+/**
+ * PopupButtonWidgets toggle the visibility of a contained {@link OO.ui.PopupWidget PopupWidget},
+ * which is used to display additional information or options.
+ *
+ *     @example
+ *     // Example of a popup button.
+ *     var popupButton = new OO.ui.PopupButtonWidget( {
+ *         label: 'Popup button with options',
+ *         icon: 'menu',
+ *         popup: {
+ *             $content: $( '<p>Additional options here.</p>' ),
+ *             padded: true,
+ *             align: 'force-left'
+ *         }
+ *     } );
+ *     // Append the button to the DOM.
+ *     $( 'body' ).append( popupButton.$element );
+ *
+ * @class
+ * @extends OO.ui.ButtonWidget
+ * @mixins OO.ui.PopupElement
+ *
+ * @constructor
+ * @param {Object} [config] Configuration options
+ */
+OO.ui.PopupButtonWidget = function OoUiPopupButtonWidget( config ) {
+	// Parent constructor
+	OO.ui.PopupButtonWidget.super.call( this, config );
+
+	// Mixin constructors
+	OO.ui.PopupElement.call( this, config );
+
+	// Events
+	this.connect( this, { click: 'onAction' } );
+
+	// Initialization
+	this.$element
+		.addClass( 'oo-ui-popupButtonWidget' )
+		.attr( 'aria-haspopup', 'true' )
+		.append( this.popup.$element );
+};
+
+/* Setup */
+
+OO.inheritClass( OO.ui.PopupButtonWidget, OO.ui.ButtonWidget );
+OO.mixinClass( OO.ui.PopupButtonWidget, OO.ui.PopupElement );
+
+/* Methods */
+
+/**
+ * Handle the button action being triggered.
+ *
+ * @private
+ */
+OO.ui.PopupButtonWidget.prototype.onAction = function () {
+	this.popup.toggle();
+};