diff --git a/externs/olx.js b/externs/olx.js
index e8f339958f..ad1c275762 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -98,6 +98,14 @@ olx.GeolocationOptions.prototype.trackingOptions;
 olx.GeolocationOptions.prototype.projection;
 
 
+/**
+ * Object literal with config options for the map logo.
+ * @typedef {{href: (string), src: (string)}}
+ * @api
+ */
+olx.LogoOptions;
+
+
 /**
  * Object literal with config options for the map.
  * @typedef {{controls: (ol.Collection|Array.<ol.control.Control>|undefined),
@@ -106,7 +114,7 @@ olx.GeolocationOptions.prototype.projection;
  *     interactions: (ol.Collection|Array.<ol.interaction.Interaction>|undefined),
  *     keyboardEventTarget: (Element|Document|string|undefined),
  *     layers: (Array.<ol.layer.Base>|ol.Collection|undefined),
- *     logo: (boolean|string|Object|undefined),
+ *     logo: (boolean|string|olx.LogoOptions|undefined),
  *     overlays: (ol.Collection|Array.<ol.Overlay>|undefined),
  *     renderer: (ol.RendererType|Array.<ol.RendererType|string>|string|undefined),
  *     target: (Element|string|undefined),
@@ -173,7 +181,7 @@ olx.MapOptions.prototype.layers;
  * provided, the `src` property should be the URL for an image and the `href`
  * property should be a URL for creating a link. To disable the map logo, set
  * the option to `false`. By default, the OpenLayers 3 logo is shown.
- * @type {boolean|string|Object|undefined}
+ * @type {boolean|string|olx.LogoOptions|undefined}
  */
 olx.MapOptions.prototype.logo;
 
@@ -2563,7 +2571,7 @@ olx.source.BingMapsOptions.prototype.tileLoadFunction;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     extent: (ol.Extent|undefined),
  *     format: ol.format.Feature,
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike}}
  * @api
  */
@@ -2593,7 +2601,7 @@ olx.source.FormatVectorOptions.prototype.format;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.FormatVectorOptions.prototype.logo;
 
@@ -2609,7 +2617,7 @@ olx.source.FormatVectorOptions.prototype.projection;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     defaultProjection: ol.proj.ProjectionLike,
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     object: (GeoJSONObject|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     text: (string|undefined),
@@ -2643,7 +2651,7 @@ olx.source.GeoJSONOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.GeoJSONOptions.prototype.logo;
 
@@ -2688,7 +2696,7 @@ olx.source.GeoJSONOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     doc: (Document|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     node: (Node|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     text: (string|undefined),
@@ -2722,7 +2730,7 @@ olx.source.GPXOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.GPXOptions.prototype.logo;
 
@@ -2767,7 +2775,7 @@ olx.source.GPXOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *            crossOrigin: (null|string|undefined),
  *            extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
  *            opaque: (boolean|undefined),
  *            projection: ol.proj.ProjectionLike,
  *            tileClass: (function(new: ol.ImageTile, ol.TileCoord,
@@ -2805,7 +2813,7 @@ olx.source.TileImageOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.TileImageOptions.prototype.logo;
 
@@ -2869,7 +2877,7 @@ olx.source.TileImageOptions.prototype.tileUrlFunction;
  *     defaultProjection: ol.proj.ProjectionLike,
  *     extent: (ol.Extent|undefined),
  *     format: ol.format.Feature,
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     object: (GeoJSONObject|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     tileGrid: ol.tilegrid.TileGrid,
@@ -2911,7 +2919,7 @@ olx.source.TileVectorOptions.prototype.format;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.TileVectorOptions.prototype.logo;
 
@@ -2964,7 +2972,7 @@ olx.source.TileVectorOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     defaultProjection: ol.proj.ProjectionLike,
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     object: (GeoJSONObject|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     text: (string|undefined),
@@ -2997,7 +3005,7 @@ olx.source.TopoJSONOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.TopoJSONOptions.prototype.logo;
 
@@ -3172,7 +3180,7 @@ olx.source.MapGuideOptions.prototype.params;
  *     defaultStyle: (Array.<ol.style.Style>|undefined),
  *     doc: (Document|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     node: (Node|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     text: (string|undefined),
@@ -3213,7 +3221,7 @@ olx.source.KMLOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.KMLOptions.prototype.logo;
 
@@ -3358,7 +3366,7 @@ olx.source.OSMOptions.prototype.url;
  *     defaultStyle: (Array.<ol.style.Style>|undefined),
  *     doc: (Document|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     node: (Node|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     reprojectTo: ol.proj.ProjectionLike,
@@ -3400,7 +3408,7 @@ olx.source.OSMXMLOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.OSMXMLOptions.prototype.logo;
 
@@ -3451,7 +3459,7 @@ olx.source.OSMXMLOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     canvasFunction: ol.CanvasFunctionType,
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     ratio: (number|undefined),
  *     resolutions: (Array.<number>|undefined),
@@ -3491,7 +3499,7 @@ olx.source.ImageCanvasOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ImageCanvasOptions.prototype.logo;
 
@@ -3529,7 +3537,7 @@ olx.source.ImageCanvasOptions.prototype.state;
 /**
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     ratio: (number|undefined),
  *     resolutions: (Array.<number>|undefined),
@@ -3556,7 +3564,7 @@ olx.source.ImageVectorOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ImageVectorOptions.prototype.logo;
 
@@ -3605,7 +3613,7 @@ olx.source.ImageVectorOptions.prototype.style;
  *     extent: (ol.Extent|undefined),
  *     hidpi: (boolean|undefined),
  *     serverType: (ol.source.wms.ServerType|string|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     params: Object.<string,*>,
  *     projection: ol.proj.ProjectionLike,
  *     ratio: (number|undefined),
@@ -3655,7 +3663,7 @@ olx.source.ImageWMSOptions.prototype.serverType;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ImageWMSOptions.prototype.logo;
 
@@ -3758,7 +3766,7 @@ olx.source.StamenOptions.prototype.url;
  *     extent: (ol.Extent|undefined),
  *     imageExtent: (ol.Extent|undefined),
  *     imageSize: (ol.Size|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     url: string}}
  * @api
@@ -3803,7 +3811,7 @@ olx.source.ImageStaticOptions.prototype.imageSize;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ImageStaticOptions.prototype.logo;
 
@@ -3828,7 +3836,7 @@ olx.source.ImageStaticOptions.prototype.url;
  *     format: ol.format.Feature,
  *     loader: function(this: ol.source.ServerVector, ol.Extent, number, ol.proj.Projection),
  *     strategy: (function(ol.Extent, number): Array.<ol.Extent>|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike}}
  * @api
  */
@@ -3873,7 +3881,7 @@ olx.source.ServerVectorOptions.prototype.strategy;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ServerVectorOptions.prototype.logo;
 
@@ -3922,7 +3930,7 @@ olx.source.TileJSONOptions.prototype.url;
  *     extent: (ol.Extent|undefined),
  *     gutter: (number|undefined),
  *     hidpi: (boolean|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     tileGrid: (ol.tilegrid.TileGrid|undefined),
  *     maxZoom: (number|undefined),
  *     projection: ol.proj.ProjectionLike,
@@ -3989,7 +3997,7 @@ olx.source.TileWMSOptions.prototype.hidpi;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.TileWMSOptions.prototype.logo;
 
@@ -4053,7 +4061,7 @@ olx.source.TileWMSOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     extent: (ol.Extent|undefined),
  *     features: (Array.<ol.Feature>|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     state: (ol.source.State|string|undefined)}}
  * @api
@@ -4084,7 +4092,7 @@ olx.source.VectorOptions.prototype.features;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.VectorOptions.prototype.logo;
 
@@ -4109,7 +4117,7 @@ olx.source.VectorOptions.prototype.state;
  *     doc: (Document|undefined),
  *     extent: (ol.Extent|undefined),
  *     format: ol.format.Feature,
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     node: (Node|undefined),
  *     object: (Object|undefined),
  *     projection: ol.proj.ProjectionLike,
@@ -4158,7 +4166,7 @@ olx.source.StaticVectorOptions.prototype.format;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.StaticVectorOptions.prototype.logo;
 
@@ -4209,7 +4217,7 @@ olx.source.StaticVectorOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     crossOrigin: (string|null|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     tileGrid: ol.tilegrid.WMTS,
  *     projection: ol.proj.ProjectionLike,
  *     requestEncoding: (ol.source.WMTSRequestEncoding|undefined),
@@ -4252,7 +4260,7 @@ olx.source.WMTSOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.WMTSOptions.prototype.logo;
 
@@ -4362,7 +4370,7 @@ olx.source.WMTSOptions.prototype.urls;
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     crossOrigin: (null|string|undefined),
  *     extent: (ol.Extent|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     projection: ol.proj.ProjectionLike,
  *     maxZoom: (number|undefined),
  *     minZoom: (number|undefined),
@@ -4400,7 +4408,7 @@ olx.source.XYZOptions.prototype.extent;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.XYZOptions.prototype.logo;
 
@@ -4475,7 +4483,7 @@ olx.source.XYZOptions.prototype.wrapX;
 /**
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *     crossOrigin: (null|string|undefined),
- *     logo: (string|Object|undefined),
+ *     logo: (string|olx.LogoOptions|undefined),
  *     url: !string,
  *     tierSizeCalculation: (string|undefined),
  *     size: ol.Size}}
@@ -4500,7 +4508,7 @@ olx.source.ZoomifyOptions.prototype.crossOrigin;
 
 /**
  * Logo.
- * @type{string|Object|undefined}
+ * @type{string|olx.LogoOptions|undefined}
  */
 olx.source.ZoomifyOptions.prototype.logo;
 
diff --git a/src/ol/source/imagesource.js b/src/ol/source/imagesource.js
index b83ee13814..ed438518d9 100644
--- a/src/ol/source/imagesource.js
+++ b/src/ol/source/imagesource.js
@@ -11,7 +11,7 @@ goog.require('ol.source.Source');
 /**
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *            extent: (null|ol.Extent|undefined),
- *            logo: (string|Object|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
  *            projection: ol.proj.ProjectionLike,
  *            resolutions: (Array.<number>|undefined),
  *            state: (ol.source.State|string|undefined)}}
diff --git a/src/ol/source/source.js b/src/ol/source/source.js
index 27c6543bbb..a7633ecd9f 100644
--- a/src/ol/source/source.js
+++ b/src/ol/source/source.js
@@ -23,7 +23,7 @@ ol.source.State = {
 /**
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *            extent: (ol.Extent|undefined),
- *            logo: (string|Object|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
  *            projection: ol.proj.ProjectionLike,
  *            state: (ol.source.State|string|undefined)}}
  */
@@ -69,7 +69,7 @@ ol.source.Source = function(options) {
 
   /**
    * @private
-   * @type {string|Object|undefined}
+   * @type {string|olx.LogoOptions|undefined}
    */
   this.logo_ = options.logo;
 
@@ -115,7 +115,7 @@ ol.source.Source.prototype.getExtent = function() {
 
 
 /**
- * @return {string|Object|undefined} Logo.
+ * @return {string|olx.LogoOptions|undefined} Logo.
  */
 ol.source.Source.prototype.getLogo = function() {
   return this.logo_;
@@ -162,7 +162,7 @@ ol.source.Source.prototype.setExtent = function(extent) {
 
 
 /**
- * @param {string|Object|undefined} logo Logo.
+ * @param {string|olx.LogoOptions|undefined} logo Logo.
  */
 ol.source.Source.prototype.setLogo = function(logo) {
   this.logo_ = logo;
diff --git a/src/ol/source/tilesource.js b/src/ol/source/tilesource.js
index fe14524e4b..51b021f3a1 100644
--- a/src/ol/source/tilesource.js
+++ b/src/ol/source/tilesource.js
@@ -13,7 +13,7 @@ goog.require('ol.tilegrid.TileGrid');
 /**
  * @typedef {{attributions: (Array.<ol.Attribution>|undefined),
  *            extent: (ol.Extent|undefined),
- *            logo: (string|Object|undefined),
+ *            logo: (string|olx.LogoOptions|undefined),
  *            opaque: (boolean|undefined),
  *            tilePixelRatio: (number|undefined),
  *            projection: ol.proj.ProjectionLike,