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+/**
+ * IndicatorElement is often mixed into other classes to generate an indicator.
+ * Indicators are small graphics that are generally used in two ways:
+ *
+ * - To draw attention to the status of an item. For example, an indicator might be
+ *   used to show that an item in a list has errors that need to be resolved.
+ * - To clarify the function of a control that acts in an exceptional way (a button
+ *   that opens a menu instead of performing an action directly, for example).
+ *
+ * For a list of indicators included in the library, please see the
+ * [OOjs UI documentation on MediaWiki] [1].
+ *
+ * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Widgets/Icons,_Indicators,_and_Labels#Indicators
+ *
+ * @abstract
+ * @class
+ *
+ * @constructor
+ * @param {Object} [config] Configuration options
+ * @cfg {jQuery} [$indicator] The indicator element created by the class. If this
+ *  configuration is omitted, the indicator element will use a generated `<span>`.
+ * @cfg {string} [indicator] Symbolic name of the indicator (e.g., ‘alert’ or  ‘down’).
+ *  See the [OOjs UI documentation on MediaWiki][2] for a list of indicators included
+ *  in the library.
+ * [2]: https://www.mediawiki.org/wiki/OOjs_UI/Widgets/Icons,_Indicators,_and_Labels#Indicators
+ * @cfg {string|Function} [indicatorTitle] A text string used as the indicator title,
+ *  or a function that returns title text. The indicator title is displayed when users move
+ *  the mouse over the indicator.
+ */
+OO.ui.IndicatorElement = function OoUiIndicatorElement( config ) {
+	// Configuration initialization
+	config = config || {};
+
+	// Properties
+	this.$indicator = null;
+	this.indicator = null;
+	this.indicatorTitle = null;
+
+	// Initialization
+	this.setIndicator( config.indicator || this.constructor.static.indicator );
+	this.setIndicatorTitle( config.indicatorTitle || this.constructor.static.indicatorTitle );
+	this.setIndicatorElement( config.$indicator || $( '<span>' ) );
+};
+
+/* Setup */
+
+OO.initClass( OO.ui.IndicatorElement );
+
+/* Static Properties */
+
+/**
+ * Symbolic name of the indicator (e.g., ‘alert’ or  ‘down’).
+ * The static property will be overridden if the #indicator configuration is used.
+ *
+ * @static
+ * @inheritable
+ * @property {string|null}
+ */
+OO.ui.IndicatorElement.static.indicator = null;
+
+/**
+ * A text string used as the indicator title, a function that returns title text, or `null`
+ * for no title. The static property will be overridden if the #indicatorTitle configuration is used.
+ *
+ * @static
+ * @inheritable
+ * @property {string|Function|null}
+ */
+OO.ui.IndicatorElement.static.indicatorTitle = null;
+
+/* Methods */
+
+/**
+ * Set the indicator element.
+ *
+ * If an element is already set, it will be cleaned up before setting up the new element.
+ *
+ * @param {jQuery} $indicator Element to use as indicator
+ */
+OO.ui.IndicatorElement.prototype.setIndicatorElement = function ( $indicator ) {
+	if ( this.$indicator ) {
+		this.$indicator
+			.removeClass( 'oo-ui-indicatorElement-indicator oo-ui-indicator-' + this.indicator )
+			.removeAttr( 'title' );
+	}
+
+	this.$indicator = $indicator
+		.addClass( 'oo-ui-indicatorElement-indicator' )
+		.toggleClass( 'oo-ui-indicator-' + this.indicator, !!this.indicator );
+	if ( this.indicatorTitle !== null ) {
+		this.$indicator.attr( 'title', this.indicatorTitle );
+	}
+};
+
+/**
+ * Set the indicator by its symbolic name: ‘alert’, ‘down’, ‘next’, ‘previous’, ‘required’, ‘up’. Use `null` to remove the indicator.
+ *
+ * @param {string|null} indicator Symbolic name of indicator, or `null` for no indicator
+ * @chainable
+ */
+OO.ui.IndicatorElement.prototype.setIndicator = function ( indicator ) {
+	indicator = typeof indicator === 'string' && indicator.length ? indicator.trim() : null;
+
+	if ( this.indicator !== indicator ) {
+		if ( this.$indicator ) {
+			if ( this.indicator !== null ) {
+				this.$indicator.removeClass( 'oo-ui-indicator-' + this.indicator );
+			}
+			if ( indicator !== null ) {
+				this.$indicator.addClass( 'oo-ui-indicator-' + indicator );
+			}
+		}
+		this.indicator = indicator;
+	}
+
+	this.$element.toggleClass( 'oo-ui-indicatorElement', !!this.indicator );
+	this.updateThemeClasses();
+
+	return this;
+};
+
+/**
+ * Set the indicator title.
+ *
+ * The title is displayed when a user moves the mouse over the indicator.
+ *
+ * @param {string|Function|null} indicator Indicator title text, a function that returns text, or
+ *   `null` for no indicator title
+ * @chainable
+ */
+OO.ui.IndicatorElement.prototype.setIndicatorTitle = function ( indicatorTitle ) {
+	indicatorTitle = typeof indicatorTitle === 'function' ||
+		( typeof indicatorTitle === 'string' && indicatorTitle.length ) ?
+			OO.ui.resolveMsg( indicatorTitle ) : null;
+
+	if ( this.indicatorTitle !== indicatorTitle ) {
+		this.indicatorTitle = indicatorTitle;
+		if ( this.$indicator ) {
+			if ( this.indicatorTitle !== null ) {
+				this.$indicator.attr( 'title', indicatorTitle );
+			} else {
+				this.$indicator.removeAttr( 'title' );
+			}
+		}
+	}
+
+	return this;
+};
+
+/**
+ * Get the symbolic name of the indicator (e.g., ‘alert’ or  ‘down’).
+ *
+ * @return {string} Symbolic name of indicator
+ */
+OO.ui.IndicatorElement.prototype.getIndicator = function () {
+	return this.indicator;
+};
+
+/**
+ * Get the indicator title.
+ *
+ * The title is displayed when a user moves the mouse over the indicator.
+ *
+ * @return {string} Indicator title text
+ */
+OO.ui.IndicatorElement.prototype.getIndicatorTitle = function () {
+	return this.indicatorTitle;
+};