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+/**
+ * RadioInputWidget creates a single radio button. Because radio buttons are usually used as a set,
+ * in most cases you will want to use a {@link OO.ui.RadioSelectWidget radio select}
+ * with {@link OO.ui.RadioOptionWidget radio options} instead of this class. For more information,
+ * please see the [OOjs UI documentation on MediaWiki][1].
+ *
+ * This widget can be used inside a HTML form, such as a OO.ui.FormLayout.
+ *
+ *     @example
+ *     // An example of selected, unselected, and disabled radio inputs
+ *     var radio1 = new OO.ui.RadioInputWidget( {
+ *         value: 'a',
+ *         selected: true
+ *     } );
+ *     var radio2 = new OO.ui.RadioInputWidget( {
+ *         value: 'b'
+ *     } );
+ *     var radio3 = new OO.ui.RadioInputWidget( {
+ *         value: 'c',
+ *         disabled: true
+ *     } );
+ *     // Create a fieldset layout with fields for each radio button.
+ *     var fieldset = new OO.ui.FieldsetLayout( {
+ *         label: 'Radio inputs'
+ *     } );
+ *     fieldset.addItems( [
+ *         new OO.ui.FieldLayout( radio1, { label: 'Selected', align: 'inline' } ),
+ *         new OO.ui.FieldLayout( radio2, { label: 'Unselected', align: 'inline' } ),
+ *         new OO.ui.FieldLayout( radio3, { label: 'Disabled', align: 'inline' } ),
+ *     ] );
+ *     $( 'body' ).append( fieldset.$element );
+ *
+ * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Widgets/Inputs
+ *
+ * @class
+ * @extends OO.ui.InputWidget
+ *
+ * @constructor
+ * @param {Object} [config] Configuration options
+ * @cfg {boolean} [selected=false] Select the radio button initially. By default, the radio button is not selected.
+ */
+OO.ui.RadioInputWidget = function OoUiRadioInputWidget( config ) {
+	// Configuration initialization
+	config = config || {};
+
+	// Parent constructor
+	OO.ui.RadioInputWidget.super.call( this, config );
+
+	// Initialization
+	this.$element.addClass( 'oo-ui-radioInputWidget' );
+	this.setSelected( config.selected !== undefined ? config.selected : false );
+};
+
+/* Setup */
+
+OO.inheritClass( OO.ui.RadioInputWidget, OO.ui.InputWidget );
+
+/* Methods */
+
+/**
+ * @inheritdoc
+ * @private
+ */
+OO.ui.RadioInputWidget.prototype.getInputElement = function () {
+	return $( '<input type="radio" />' );
+};
+
+/**
+ * @inheritdoc
+ */
+OO.ui.RadioInputWidget.prototype.onEdit = function () {
+	// RadioInputWidget doesn't track its state.
+};
+
+/**
+ * Set selection state of this radio button.
+ *
+ * @param {boolean} state `true` for selected
+ * @chainable
+ */
+OO.ui.RadioInputWidget.prototype.setSelected = function ( state ) {
+	// RadioInputWidget doesn't track its state.
+	this.$input.prop( 'checked', state );
+	return this;
+};
+
+/**
+ * Check if this radio button is selected.
+ *
+ * @return {boolean} Radio is selected
+ */
+OO.ui.RadioInputWidget.prototype.isSelected = function () {
+	return this.$input.prop( 'checked' );
+};