diff --git a/config/example.json b/config/example.json
index dff7c67e16..ee41151bf4 100644
--- a/config/example.json
+++ b/config/example.json
@@ -28,12 +28,14 @@
     ],
     "jscomp_off": [
       "lintChecks",
+      "analyzerChecks",
       "missingProvide",
       "unknownDefines"
     ],
     "extra_annotation_name": [
       "api", "observable"
     ],
+    "rewrite_polyfills": "false",
     "compilation_level": "ADVANCED",
     "warning_level": "VERBOSE",
     "output_wrapper": "(function(){%output%})();",
diff --git a/config/examples-all.json b/config/examples-all.json
index 3c66049069..253554441b 100644
--- a/config/examples-all.json
+++ b/config/examples-all.json
@@ -27,11 +27,14 @@
       "*"
     ],
     "jscomp_off": [
-      "lintChecks"
+      "lintChecks",
+      "analyzerChecks",
+      "unusedLocalVariables"
     ],
     "extra_annotation_name": [
       "api", "observable"
     ],
+    "rewrite_polyfills": "false",
     "compilation_level": "ADVANCED",
     "warning_level": "VERBOSE",
     "output_wrapper": "(function(){%output%})();",
diff --git a/config/ol.json b/config/ol.json
index 044957ae2c..d0479e5b70 100644
--- a/config/ol.json
+++ b/config/ol.json
@@ -21,11 +21,13 @@
       "*"
     ],
     "jscomp_off": [
-      "lintChecks"
+      "lintChecks",
+      "analyzerChecks"
     ],
     "extra_annotation_name": [
       "api", "observable"
     ],
+    "rewrite_polyfills": "false",
     "compilation_level": "ADVANCED",
     "warning_level": "VERBOSE",
     "use_types_for_optimization": true,
diff --git a/doc/tutorials/closure.md b/doc/tutorials/closure.md
index 723b915003..6e3f26cafd 100644
--- a/doc/tutorials/closure.md
+++ b/doc/tutorials/closure.md
@@ -178,6 +178,7 @@ The minimum config file looks like this:
     "extra_annotation_name": [
       "api", "observable"
     ],
+    "rewrite_polyfills": "false",
     "compilation_level": "ADVANCED",
     "warning_level": "VERBOSE",
     "output_wrapper": "(function(){%output%})();",
@@ -230,7 +231,8 @@ Here is a version of `config.json` with more compilation checks enabled:
     ],
     "jscomp_off": [
       "unknownDefines",
-      "lintChecks"
+      "lintChecks",
+      "analyzerChecks"
     ],
     "extra_annotation_name": [
       "api", "observable"
diff --git a/externs/closure-compiler.js b/externs/closure-compiler.js
index 973d47cf54..763c409f16 100644
--- a/externs/closure-compiler.js
+++ b/externs/closure-compiler.js
@@ -7,23 +7,3 @@
  *
  * @externs
  */
-
-
-// see https://github.com/google/closure-compiler/pull/1991
-
-/**
- * @param {*} arg
- * @return {boolean}
- * @nosideeffects
- * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/isView
- */
-ArrayBuffer.isView = function(arg) {};
-
-
-// see https://github.com/google/closure-compiler/pull/1206
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/pointerevents/#the-touch-action-css-property
- */
-CSSProperties.prototype.touchAction;
diff --git a/package.json b/package.json
index 8da150a2a4..78b9d813e8 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
   "dependencies": {
     "async": "2.1.4",
     "browserify": "13.1.1",
-    "closure-util": "1.15.1",
+    "closure-util": "1.17.0",
     "derequire": "2.0.6",
     "fs-extra": "1.0.0",
     "glob": "7.1.1",
diff --git a/src/ol/control/control.js b/src/ol/control/control.js
index eaaefbfc7f..8f7ffb176b 100644
--- a/src/ol/control/control.js
+++ b/src/ol/control/control.js
@@ -101,6 +101,7 @@ ol.control.Control.prototype.getMap = function() {
  * Subclasses may set up event handlers to get notified about changes to
  * the map here.
  * @param {ol.Map} map Map.
+ * @override
  * @api stable
  */
 ol.control.Control.prototype.setMap = function(map) {
diff --git a/src/ol/events/event.js b/src/ol/events/event.js
index 90301d236b..6b571364f9 100644
--- a/src/ol/events/event.js
+++ b/src/ol/events/event.js
@@ -42,6 +42,7 @@ ol.events.Event = function(type) {
 /**
  * Stop event propagation.
  * @function
+ * @override
  * @api stable
  */
 ol.events.Event.prototype.preventDefault =
@@ -49,6 +50,7 @@ ol.events.Event.prototype.preventDefault =
 /**
  * Stop event propagation.
  * @function
+ * @override
  * @api stable
  */
 ol.events.Event.prototype.stopPropagation = function() {
diff --git a/src/ol/format/esrijson.js b/src/ol/format/esrijson.js
index a304cacec9..ce0e5e6d1a 100644
--- a/src/ol/format/esrijson.js
+++ b/src/ol/format/esrijson.js
@@ -582,6 +582,7 @@ ol.format.EsriJSON.prototype.writeGeometry;
  * @param {ol.geom.Geometry} geometry Geometry.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {EsriJSONGeometry} Object.
+ * @override
  * @api
  */
 ol.format.EsriJSON.prototype.writeGeometryObject = function(geometry,
@@ -609,6 +610,7 @@ ol.format.EsriJSON.prototype.writeFeature;
  * @param {ol.Feature} feature Feature.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {Object} Object.
+ * @override
  * @api
  */
 ol.format.EsriJSON.prototype.writeFeatureObject = function(
@@ -655,6 +657,7 @@ ol.format.EsriJSON.prototype.writeFeatures;
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {Object} EsriJSON Object.
+ * @override
  * @api
  */
 ol.format.EsriJSON.prototype.writeFeaturesObject = function(features, opt_options) {
diff --git a/src/ol/format/feature.js b/src/ol/format/feature.js
index 6a4f30b2c9..770da1dcc3 100644
--- a/src/ol/format/feature.js
+++ b/src/ol/format/feature.js
@@ -15,6 +15,7 @@ goog.require('ol.proj');
  * file formats.  See the documentation for each format for more details.
  *
  * @constructor
+ * @abstract
  * @api stable
  */
 ol.format.Feature = function() {
diff --git a/src/ol/format/filter/logicalnary.js b/src/ol/format/filter/logicalnary.js
index fd19fe8909..530c5e4d4f 100644
--- a/src/ol/format/filter/logicalnary.js
+++ b/src/ol/format/filter/logicalnary.js
@@ -1,6 +1,7 @@
 goog.provide('ol.format.filter.LogicalNary');
 
 goog.require('ol');
+goog.require('ol.asserts');
 goog.require('ol.format.filter.Filter');
 
 
diff --git a/src/ol/format/geojson.js b/src/ol/format/geojson.js
index f93175eb6d..172814154b 100644
--- a/src/ol/format/geojson.js
+++ b/src/ol/format/geojson.js
@@ -479,6 +479,7 @@ ol.format.GeoJSON.prototype.readProjectionFromObject = function(object) {
  * @param {ol.Feature} feature Feature.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {string} GeoJSON.
+ * @override
  * @api stable
  */
 ol.format.GeoJSON.prototype.writeFeature;
@@ -490,6 +491,7 @@ ol.format.GeoJSON.prototype.writeFeature;
  * @param {ol.Feature} feature Feature.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {GeoJSONFeature} Object.
+ * @override
  * @api stable
  */
 ol.format.GeoJSON.prototype.writeFeatureObject = function(feature, opt_options) {
@@ -538,6 +540,7 @@ ol.format.GeoJSON.prototype.writeFeatures;
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {GeoJSONFeatureCollection} GeoJSON Object.
+ * @override
  * @api stable
  */
 ol.format.GeoJSON.prototype.writeFeaturesObject = function(features, opt_options) {
@@ -572,6 +575,7 @@ ol.format.GeoJSON.prototype.writeGeometry;
  * @param {ol.geom.Geometry} geometry Geometry.
  * @param {olx.format.WriteOptions=} opt_options Write options.
  * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.
+ * @override
  * @api stable
  */
 ol.format.GeoJSON.prototype.writeGeometryObject = function(geometry,
diff --git a/src/ol/format/gml3.js b/src/ol/format/gml3.js
index 01e745d6c8..531ef3fccf 100644
--- a/src/ol/format/gml3.js
+++ b/src/ol/format/gml3.js
@@ -1162,6 +1162,7 @@ ol.format.GML3.prototype.GEOMETRY_NODE_FACTORY_ = function(value, objectStack, o
  * @param {ol.geom.Geometry} geometry Geometry.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
+ * @override
  * @api
  */
 ol.format.GML3.prototype.writeGeometryNode = function(geometry, opt_options) {
@@ -1196,6 +1197,7 @@ ol.format.GML3.prototype.writeFeatures;
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
+ * @override
  * @api
  */
 ol.format.GML3.prototype.writeFeaturesNode = function(features, opt_options) {
diff --git a/src/ol/format/gmlbase.js b/src/ol/format/gmlbase.js
index ef90cc412e..257122155c 100644
--- a/src/ol/format/gmlbase.js
+++ b/src/ol/format/gmlbase.js
@@ -31,6 +31,7 @@ goog.require('ol.xml');
  * ol.format.GML3.
  *
  * @constructor
+ * @abstract
  * @param {olx.format.GMLOptions=} opt_options
  *     Optional configuration object.
  * @extends {ol.format.XMLFeature}
diff --git a/src/ol/format/gpx.js b/src/ol/format/gpx.js
index b7b1340607..cbca26a1b4 100644
--- a/src/ol/format/gpx.js
+++ b/src/ol/format/gpx.js
@@ -926,6 +926,7 @@ ol.format.GPX.prototype.writeFeatures;
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
+ * @override
  * @api
  */
 ol.format.GPX.prototype.writeFeaturesNode = function(features, opt_options) {
diff --git a/src/ol/format/igc.js b/src/ol/format/igc.js
index 34af4fcf71..19db22cf4d 100644
--- a/src/ol/format/igc.js
+++ b/src/ol/format/igc.js
@@ -202,3 +202,31 @@ ol.format.IGC.prototype.readFeaturesFromText = function(text, opt_options) {
  * @api
  */
 ol.format.IGC.prototype.readProjection;
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.writeFeatureText = function(feature, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.writeFeaturesText = function(features, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.writeGeometryText = function(geometry, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.IGC.prototype.readGeometryFromText = function(text, opt_options) {};
diff --git a/src/ol/format/jsonfeature.js b/src/ol/format/jsonfeature.js
index 7439c08e6b..95ec963001 100644
--- a/src/ol/format/jsonfeature.js
+++ b/src/ol/format/jsonfeature.js
@@ -12,6 +12,7 @@ goog.require('ol.format.FormatType');
  * Base class for JSON feature formats.
  *
  * @constructor
+ * @abstract
  * @extends {ol.format.Feature}
  */
 ol.format.JSONFeature = function() {
diff --git a/src/ol/format/kml.js b/src/ol/format/kml.js
index 49583d6075..3107de95e8 100644
--- a/src/ol/format/kml.js
+++ b/src/ol/format/kml.js
@@ -3018,6 +3018,7 @@ ol.format.KML.prototype.writeFeatures;
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
+ * @override
  * @api
  */
 ol.format.KML.prototype.writeFeaturesNode = function(features, opt_options) {
diff --git a/src/ol/format/mvt.js b/src/ol/format/mvt.js
index c3217627fb..5b83304ab8 100644
--- a/src/ol/format/mvt.js
+++ b/src/ol/format/mvt.js
@@ -253,3 +253,38 @@ ol.format.MVT.readGeometry_ = function(rawFeature) {
 
   return geom;
 };
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.MVT.prototype.readFeature = function() {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.MVT.prototype.readGeometry = function() {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.MVT.prototype.writeFeature = function() {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.MVT.prototype.writeGeometry = function() {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.MVT.prototype.writeFeatures = function() {};
diff --git a/src/ol/format/osmxml.js b/src/ol/format/osmxml.js
index 4ccc4ddf72..ef3eb13b12 100644
--- a/src/ol/format/osmxml.js
+++ b/src/ol/format/osmxml.js
@@ -208,3 +208,24 @@ ol.format.OSMXML.prototype.readFeaturesFromNode = function(node, opt_options) {
  * @api stable
  */
 ol.format.OSMXML.prototype.readProjection;
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.OSMXML.prototype.writeFeatureNode = function(feature, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.OSMXML.prototype.writeFeaturesNode = function(features, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.OSMXML.prototype.writeGeometryNode = function(geometry, opt_options) {};
diff --git a/src/ol/format/ows.js b/src/ol/format/ows.js
index 3f9b079df3..3ed2be4e83 100644
--- a/src/ol/format/ows.js
+++ b/src/ol/format/ows.js
@@ -18,8 +18,7 @@ ol.inherits(ol.format.OWS, ol.format.XML);
 
 
 /**
- * @param {Document} doc Document.
- * @return {Object} OWS object.
+ * @inheritDoc
  */
 ol.format.OWS.prototype.readFromDocument = function(doc) {
   for (var n = doc.firstChild; n; n = n.nextSibling) {
@@ -32,8 +31,7 @@ ol.format.OWS.prototype.readFromDocument = function(doc) {
 
 
 /**
- * @param {Node} node Node.
- * @return {Object} OWS object.
+ * @inheritDoc
  */
 ol.format.OWS.prototype.readFromNode = function(node) {
   var owsObject = ol.xml.pushParseAndPop({},
diff --git a/src/ol/format/textfeature.js b/src/ol/format/textfeature.js
index 1bfb0f3676..3651d25b26 100644
--- a/src/ol/format/textfeature.js
+++ b/src/ol/format/textfeature.js
@@ -12,6 +12,7 @@ goog.require('ol.format.FormatType');
  * Base class for text feature formats.
  *
  * @constructor
+ * @abstract
  * @extends {ol.format.Feature}
  */
 ol.format.TextFeature = function() {
diff --git a/src/ol/format/topojson.js b/src/ol/format/topojson.js
index c0c4a5b263..34ea6874cc 100644
--- a/src/ol/format/topojson.js
+++ b/src/ol/format/topojson.js
@@ -366,12 +366,18 @@ ol.format.TopoJSON.transformVertex_ = function(vertex, scale, translate) {
 /**
  * Read the projection from a TopoJSON source.
  *
- * @function
  * @param {Document|Node|Object|string} object Source.
  * @return {ol.proj.Projection} Projection.
+ * @override
  * @api stable
  */
-ol.format.TopoJSON.prototype.readProjection = function(object) {
+ol.format.TopoJSON.prototype.readProjection;
+
+
+/**
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.readProjectionFromObject = function(object) {
   return this.defaultDataProjection;
 };
 
@@ -389,3 +395,38 @@ ol.format.TopoJSON.GEOMETRY_READERS_ = {
   'MultiLineString': ol.format.TopoJSON.readMultiLineStringGeometry_,
   'MultiPolygon': ol.format.TopoJSON.readMultiPolygonGeometry_
 };
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.writeFeatureObject = function(feature, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.writeFeaturesObject = function(features, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.TopoJSON.prototype.writeGeometryObject = function(geometry, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.TopoJSON.prototype.readGeometryFromObject = function() {};
+
+
+/**
+ * Not implemented.
+ * @override
+ */
+ol.format.TopoJSON.prototype.readFeatureFromObject = function() {};
diff --git a/src/ol/format/wmscapabilities.js b/src/ol/format/wmscapabilities.js
index 5f39a3861b..e7607ee62f 100644
--- a/src/ol/format/wmscapabilities.js
+++ b/src/ol/format/wmscapabilities.js
@@ -39,8 +39,7 @@ ol.format.WMSCapabilities.prototype.read;
 
 
 /**
- * @param {Document} doc Document.
- * @return {Object} WMS Capability object.
+ * @inheritDoc
  */
 ol.format.WMSCapabilities.prototype.readFromDocument = function(doc) {
   for (var n = doc.firstChild; n; n = n.nextSibling) {
@@ -53,8 +52,7 @@ ol.format.WMSCapabilities.prototype.readFromDocument = function(doc) {
 
 
 /**
- * @param {Node} node Node.
- * @return {Object} WMS Capability object.
+ * @inheritDoc
  */
 ol.format.WMSCapabilities.prototype.readFromNode = function(node) {
   this.version = node.getAttribute('version').trim();
diff --git a/src/ol/format/wmsgetfeatureinfo.js b/src/ol/format/wmsgetfeatureinfo.js
index 6f731d8d90..2fcb6fd62b 100644
--- a/src/ol/format/wmsgetfeatureinfo.js
+++ b/src/ol/format/wmsgetfeatureinfo.js
@@ -145,3 +145,24 @@ ol.format.WMSGetFeatureInfo.prototype.readFeaturesFromNode = function(node, opt_
   }
   return this.readFeatures_(node, [options]);
 };
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeFeatureNode = function(feature, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeFeaturesNode = function(features, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeGeometryNode = function(geometry, opt_options) {};
diff --git a/src/ol/format/wmtscapabilities.js b/src/ol/format/wmtscapabilities.js
index 12fb18f611..02d2c32fda 100644
--- a/src/ol/format/wmtscapabilities.js
+++ b/src/ol/format/wmtscapabilities.js
@@ -41,8 +41,7 @@ ol.format.WMTSCapabilities.prototype.read;
 
 
 /**
- * @param {Document} doc Document.
- * @return {Object} WMTS Capability object.
+ * @inheritDoc
  */
 ol.format.WMTSCapabilities.prototype.readFromDocument = function(doc) {
   for (var n = doc.firstChild; n; n = n.nextSibling) {
@@ -55,8 +54,7 @@ ol.format.WMTSCapabilities.prototype.readFromDocument = function(doc) {
 
 
 /**
- * @param {Node} node Node.
- * @return {Object} WMTS Capability object.
+ * @inheritDoc
  */
 ol.format.WMTSCapabilities.prototype.readFromNode = function(node) {
   var version = node.getAttribute('version').trim();
diff --git a/src/ol/format/xml.js b/src/ol/format/xml.js
index dd814078c2..9fa5eef5e8 100644
--- a/src/ol/format/xml.js
+++ b/src/ol/format/xml.js
@@ -8,6 +8,7 @@ goog.require('ol.xml');
  * Generic format for reading non-feature XML data
  *
  * @constructor
+ * @abstract
  * @struct
  */
 ol.format.XML = function() {
diff --git a/src/ol/format/xmlfeature.js b/src/ol/format/xmlfeature.js
index ce4c7a3f62..5a67c551bc 100644
--- a/src/ol/format/xmlfeature.js
+++ b/src/ol/format/xmlfeature.js
@@ -14,6 +14,7 @@ goog.require('ol.xml');
  * Base class for XML feature formats.
  *
  * @constructor
+ * @abstract
  * @extends {ol.format.Feature}
  */
 ol.format.XMLFeature = function() {
@@ -72,12 +73,13 @@ ol.format.XMLFeature.prototype.readFeatureFromDocument = function(
 
 
 /**
- * @abstract
  * @param {Node} node Node.
  * @param {olx.format.ReadOptions=} opt_options Options.
  * @return {ol.Feature} Feature.
  */
-ol.format.XMLFeature.prototype.readFeatureFromNode = function(node, opt_options) {};
+ol.format.XMLFeature.prototype.readFeatureFromNode = function(node, opt_options) {
+  return null; // not implemented
+};
 
 
 /**
@@ -147,23 +149,25 @@ ol.format.XMLFeature.prototype.readGeometry = function(source, opt_options) {
 
 
 /**
- * @abstract
  * @param {Document} doc Document.
  * @param {olx.format.ReadOptions=} opt_options Options.
  * @protected
  * @return {ol.geom.Geometry} Geometry.
  */
-ol.format.XMLFeature.prototype.readGeometryFromDocument = function(doc, opt_options) {};
+ol.format.XMLFeature.prototype.readGeometryFromDocument = function(doc, opt_options) {
+  return null; // not implemented
+};
 
 
 /**
- * @abstract
  * @param {Node} node Node.
  * @param {olx.format.ReadOptions=} opt_options Options.
  * @protected
  * @return {ol.geom.Geometry} Geometry.
  */
-ol.format.XMLFeature.prototype.readGeometryFromNode = function(node, opt_options) {};
+ol.format.XMLFeature.prototype.readGeometryFromNode = function(node, opt_options) {
+  return null; // not implemented
+};
 
 
 /**
@@ -213,13 +217,14 @@ ol.format.XMLFeature.prototype.writeFeature = function(feature, opt_options) {
 
 
 /**
- * @abstract
  * @param {ol.Feature} feature Feature.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @protected
  * @return {Node} Node.
  */
-ol.format.XMLFeature.prototype.writeFeatureNode = function(feature, opt_options) {};
+ol.format.XMLFeature.prototype.writeFeatureNode = function(feature, opt_options) {
+  return null; // not implemented
+};
 
 
 /**
@@ -232,12 +237,13 @@ ol.format.XMLFeature.prototype.writeFeatures = function(features, opt_options) {
 
 
 /**
- * @abstract
  * @param {Array.<ol.Feature>} features Features.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
  */
-ol.format.XMLFeature.prototype.writeFeaturesNode = function(features, opt_options) {};
+ol.format.XMLFeature.prototype.writeFeaturesNode = function(features, opt_options) {
+  return null; // not implemented
+};
 
 
 /**
@@ -250,9 +256,10 @@ ol.format.XMLFeature.prototype.writeGeometry = function(geometry, opt_options) {
 
 
 /**
- * @abstract
  * @param {ol.geom.Geometry} geometry Geometry.
  * @param {olx.format.WriteOptions=} opt_options Options.
  * @return {Node} Node.
  */
-ol.format.XMLFeature.prototype.writeGeometryNode = function(geometry, opt_options) {};
+ol.format.XMLFeature.prototype.writeGeometryNode = function(geometry, opt_options) {
+  return null; // not implemented
+};
diff --git a/src/ol/geom/circle.js b/src/ol/geom/circle.js
index f199cc9018..2b6e694db4 100644
--- a/src/ol/geom/circle.js
+++ b/src/ol/geom/circle.js
@@ -30,6 +30,7 @@ ol.inherits(ol.geom.Circle, ol.geom.SimpleGeometry);
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.Circle} Clone.
+ * @override
  * @api
  */
 ol.geom.Circle.prototype.clone = function() {
@@ -205,6 +206,18 @@ ol.geom.Circle.prototype.setCenterAndRadius = function(center, radius, opt_layou
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.geom.Circle.prototype.getCoordinates = function() {};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.Circle.prototype.setCoordinates = function(coordinates, opt_layout) {};
+
+
 /**
  * @param {ol.geom.GeometryLayout} layout Layout.
  * @param {Array.<number>} flatCoordinates Flat coordinates.
diff --git a/src/ol/geom/geometry.js b/src/ol/geom/geometry.js
index 86fedac283..47715d79fd 100644
--- a/src/ol/geom/geometry.js
+++ b/src/ol/geom/geometry.js
@@ -17,6 +17,7 @@ goog.require('ol.proj');
  * generic `change` event on your geometry instance.
  *
  * @constructor
+ * @abstract
  * @extends {ol.Object}
  * @api stable
  */
diff --git a/src/ol/geom/geometrycollection.js b/src/ol/geom/geometrycollection.js
index c43a40d08d..23f960ab54 100644
--- a/src/ol/geom/geometrycollection.js
+++ b/src/ol/geom/geometrycollection.js
@@ -83,6 +83,7 @@ ol.geom.GeometryCollection.prototype.listenGeometriesChange_ = function() {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.GeometryCollection} Clone.
+ * @override
  * @api stable
  */
 ol.geom.GeometryCollection.prototype.clone = function() {
@@ -302,6 +303,7 @@ ol.geom.GeometryCollection.prototype.applyTransform = function(transformFn) {
  * Translate the geometry.
  * @param {number} deltaX Delta X.
  * @param {number} deltaY Delta Y.
+ * @override
  * @api
  */
 ol.geom.GeometryCollection.prototype.translate = function(deltaX, deltaY) {
diff --git a/src/ol/geom/linearring.js b/src/ol/geom/linearring.js
index a4ebdf1559..3cc8bfcbcb 100644
--- a/src/ol/geom/linearring.js
+++ b/src/ol/geom/linearring.js
@@ -48,6 +48,7 @@ ol.inherits(ol.geom.LinearRing, ol.geom.SimpleGeometry);
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.LinearRing} Clone.
+ * @override
  * @api stable
  */
 ol.geom.LinearRing.prototype.clone = function() {
@@ -90,6 +91,7 @@ ol.geom.LinearRing.prototype.getArea = function() {
 /**
  * Return the coordinates of the linear ring.
  * @return {Array.<ol.Coordinate>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.LinearRing.prototype.getCoordinates = function() {
@@ -122,10 +124,17 @@ ol.geom.LinearRing.prototype.getType = function() {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.geom.LinearRing.prototype.intersectsExtent = function(extent) {};
+
+
 /**
  * Set the coordinates of the linear ring.
  * @param {Array.<ol.Coordinate>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.LinearRing.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/linestring.js b/src/ol/geom/linestring.js
index dff2d47d6d..dd13803d5d 100644
--- a/src/ol/geom/linestring.js
+++ b/src/ol/geom/linestring.js
@@ -78,6 +78,7 @@ ol.geom.LineString.prototype.appendCoordinate = function(coordinate) {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.LineString} Clone.
+ * @override
  * @api stable
  */
 ol.geom.LineString.prototype.clone = function() {
@@ -153,6 +154,7 @@ ol.geom.LineString.prototype.getCoordinateAtM = function(m, opt_extrapolate) {
 /**
  * Return the coordinates of the linestring.
  * @return {Array.<ol.Coordinate>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.LineString.prototype.getCoordinates = function() {
@@ -240,6 +242,7 @@ ol.geom.LineString.prototype.intersectsExtent = function(extent) {
  * Set the coordinates of the linestring.
  * @param {Array.<ol.Coordinate>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.LineString.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/multilinestring.js b/src/ol/geom/multilinestring.js
index 14377c9255..c5d15bb9f1 100644
--- a/src/ol/geom/multilinestring.js
+++ b/src/ol/geom/multilinestring.js
@@ -73,6 +73,7 @@ ol.geom.MultiLineString.prototype.appendLineString = function(lineString) {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.MultiLineString} Clone.
+ * @override
  * @api stable
  */
 ol.geom.MultiLineString.prototype.clone = function() {
@@ -140,6 +141,7 @@ ol.geom.MultiLineString.prototype.getCoordinateAtM = function(m, opt_extrapolate
 /**
  * Return the coordinates of the multilinestring.
  * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.MultiLineString.prototype.getCoordinates = function() {
@@ -257,6 +259,7 @@ ol.geom.MultiLineString.prototype.intersectsExtent = function(extent) {
  * Set the coordinates of the multilinestring.
  * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.MultiLineString.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/multipoint.js b/src/ol/geom/multipoint.js
index 35f67bf8bb..8a8c3d3c80 100644
--- a/src/ol/geom/multipoint.js
+++ b/src/ol/geom/multipoint.js
@@ -47,6 +47,7 @@ ol.geom.MultiPoint.prototype.appendPoint = function(point) {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.MultiPoint} Clone.
+ * @override
  * @api stable
  */
 ol.geom.MultiPoint.prototype.clone = function() {
@@ -85,6 +86,7 @@ ol.geom.MultiPoint.prototype.closestPointXY = function(x, y, closestPoint, minSq
 /**
  * Return the coordinates of the multipoint.
  * @return {Array.<ol.Coordinate>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.MultiPoint.prototype.getCoordinates = function() {
@@ -165,6 +167,7 @@ ol.geom.MultiPoint.prototype.intersectsExtent = function(extent) {
  * Set the coordinates of the multipoint.
  * @param {Array.<ol.Coordinate>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.MultiPoint.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/multipolygon.js b/src/ol/geom/multipolygon.js
index e7b2b5cf44..2f1a0fc4e7 100644
--- a/src/ol/geom/multipolygon.js
+++ b/src/ol/geom/multipolygon.js
@@ -111,6 +111,7 @@ ol.geom.MultiPolygon.prototype.appendPolygon = function(polygon) {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.MultiPolygon} Clone.
+ * @override
  * @api stable
  */
 ol.geom.MultiPolygon.prototype.clone = function() {
@@ -178,6 +179,7 @@ ol.geom.MultiPolygon.prototype.getArea = function() {
  *     By default, coordinate orientation will depend on how the geometry was
  *     constructed.
  * @return {Array.<Array.<Array.<ol.Coordinate>>>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.MultiPolygon.prototype.getCoordinates = function(opt_right) {
@@ -355,6 +357,7 @@ ol.geom.MultiPolygon.prototype.intersectsExtent = function(extent) {
  * Set the coordinates of the multipolygon.
  * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.MultiPolygon.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/point.js b/src/ol/geom/point.js
index 785f053e9f..21f5de6bc6 100644
--- a/src/ol/geom/point.js
+++ b/src/ol/geom/point.js
@@ -29,6 +29,7 @@ ol.inherits(ol.geom.Point, ol.geom.SimpleGeometry);
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.Point} Clone.
+ * @override
  * @api stable
  */
 ol.geom.Point.prototype.clone = function() {
@@ -62,6 +63,7 @@ ol.geom.Point.prototype.closestPointXY = function(x, y, closestPoint, minSquared
 /**
  * Return the coordinate of the point.
  * @return {ol.Coordinate} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.Point.prototype.getCoordinates = function() {
@@ -97,9 +99,7 @@ ol.geom.Point.prototype.intersectsExtent = function(extent) {
 
 
 /**
- * Set the coordinate of the point.
- * @param {ol.Coordinate} coordinates Coordinates.
- * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @inheritDoc
  * @api stable
  */
 ol.geom.Point.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/polygon.js b/src/ol/geom/polygon.js
index a698534473..54816501cb 100644
--- a/src/ol/geom/polygon.js
+++ b/src/ol/geom/polygon.js
@@ -106,6 +106,7 @@ ol.geom.Polygon.prototype.appendLinearRing = function(linearRing) {
 /**
  * Make a complete copy of the geometry.
  * @return {!ol.geom.Polygon} Clone.
+ * @override
  * @api stable
  */
 ol.geom.Polygon.prototype.clone = function() {
@@ -166,6 +167,7 @@ ol.geom.Polygon.prototype.getArea = function() {
  *     By default, coordinate orientation will depend on how the geometry was
  *     constructed.
  * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
+ * @override
  * @api stable
  */
 ol.geom.Polygon.prototype.getCoordinates = function(opt_right) {
@@ -333,6 +335,7 @@ ol.geom.Polygon.prototype.intersectsExtent = function(extent) {
  * Set the coordinates of the polygon.
  * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
  * @param {ol.geom.GeometryLayout=} opt_layout Layout.
+ * @override
  * @api stable
  */
 ol.geom.Polygon.prototype.setCoordinates = function(coordinates, opt_layout) {
diff --git a/src/ol/geom/simplegeometry.js b/src/ol/geom/simplegeometry.js
index 478cd23432..87bb61fcca 100644
--- a/src/ol/geom/simplegeometry.js
+++ b/src/ol/geom/simplegeometry.js
@@ -15,6 +15,7 @@ goog.require('ol.obj');
  * in apps, as cannot be rendered.
  *
  * @constructor
+ * @abstract
  * @extends {ol.geom.Geometry}
  * @api stable
  */
diff --git a/src/ol/image.js b/src/ol/image.js
index c4128103a3..e9eb53f848 100644
--- a/src/ol/image.js
+++ b/src/ol/image.js
@@ -70,9 +70,7 @@ ol.inherits(ol.Image, ol.ImageBase);
 
 
 /**
- * Get the HTML image element (may be a Canvas, Image, or Video).
- * @param {Object=} opt_context Object.
- * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
+ * @inheritDoc
  * @api
  */
 ol.Image.prototype.getImage = function(opt_context) {
@@ -125,6 +123,7 @@ ol.Image.prototype.handleImageLoad_ = function() {
  * Load the image or retry if loading previously failed.
  * Loading is taken care of by the tile queue, and calling this method is
  * only needed for preloading or for reloading in case of an error.
+ * @override
  * @api
  */
 ol.Image.prototype.load = function() {
diff --git a/src/ol/imagebase.js b/src/ol/imagebase.js
index 9351ab7274..f69507467b 100644
--- a/src/ol/imagebase.js
+++ b/src/ol/imagebase.js
@@ -7,6 +7,7 @@ goog.require('ol.events.EventType');
 
 /**
  * @constructor
+ * @abstract
  * @extends {ol.events.EventTarget}
  * @param {ol.Extent} extent Extent.
  * @param {number|undefined} resolution Resolution.
diff --git a/src/ol/imagecanvas.js b/src/ol/imagecanvas.js
index 13b9e5e017..6d5d25985c 100644
--- a/src/ol/imagecanvas.js
+++ b/src/ol/imagecanvas.js
@@ -73,7 +73,7 @@ ol.ImageCanvas.prototype.handleLoad_ = function(err) {
 
 
 /**
- * Trigger drawing on canvas.
+ * @inheritDoc
  */
 ol.ImageCanvas.prototype.load = function() {
   if (this.state == ol.ImageState.IDLE) {
diff --git a/src/ol/imagetile.js b/src/ol/imagetile.js
index a32e29a5db..c10af92364 100644
--- a/src/ol/imagetile.js
+++ b/src/ol/imagetile.js
@@ -116,9 +116,7 @@ ol.ImageTile.prototype.handleImageLoad_ = function() {
 
 
 /**
- * Load the image or retry if loading previously failed.
- * Loading is taken care of by the tile queue, and calling this method is
- * only needed for preloading or for reloading in case of an error.
+ * @inheritDoc
  * @api
  */
 ol.ImageTile.prototype.load = function() {
diff --git a/src/ol/interaction/draganddrop.js b/src/ol/interaction/draganddrop.js
index f2973371b0..25dbcf771b 100644
--- a/src/ol/interaction/draganddrop.js
+++ b/src/ol/interaction/draganddrop.js
@@ -101,11 +101,19 @@ ol.interaction.DragAndDrop.prototype.handleResult_ = function(file, event) {
     var view = map.getView();
     projection = view.getProjection();
   }
+
   var formatConstructors = this.formatConstructors_;
   var features = [];
   var i, ii;
   for (i = 0, ii = formatConstructors.length; i < ii; ++i) {
+    /**
+     * Avoid "cannot instantiate abstract class" error.
+     * @type {Function}
+     */
     var formatConstructor = formatConstructors[i];
+    /**
+     * @type {ol.format.Feature}
+     */
     var format = new formatConstructor();
     features = this.tryReadFeatures_(format, result, {
       featureProjection: projection
diff --git a/src/ol/interaction/select.js b/src/ol/interaction/select.js
index 0be3c9361a..6f37891de3 100644
--- a/src/ol/interaction/select.js
+++ b/src/ol/interaction/select.js
@@ -303,6 +303,7 @@ ol.interaction.Select.prototype.setHitTolerance = function(hitTolerance) {
  * Remove the interaction from its current map, if any,  and attach it to a new
  * map, if any. Pass `null` to just remove the interaction from the current map.
  * @param {ol.Map} map Map.
+ * @override
  * @api stable
  */
 ol.interaction.Select.prototype.setMap = function(map) {
diff --git a/src/ol/layer/base.js b/src/ol/layer/base.js
index b16210563c..a5c5dc9fd7 100644
--- a/src/ol/layer/base.js
+++ b/src/ol/layer/base.js
@@ -16,6 +16,7 @@ goog.require('ol.obj');
  * is observable, and has get/set accessors.
  *
  * @constructor
+ * @abstract
  * @extends {ol.Object}
  * @param {olx.layer.BaseOptions} options Layer options.
  * @api stable
diff --git a/src/ol/layer/group.js b/src/ol/layer/group.js
index 43a51c93f7..4a77de05ad 100644
--- a/src/ol/layer/group.js
+++ b/src/ol/layer/group.js
@@ -70,6 +70,12 @@ ol.layer.Group = function(opt_options) {
 ol.inherits(ol.layer.Group, ol.layer.Base);
 
 
+/**
+ * @inheritDoc
+ */
+ol.layer.Group.prototype.createRenderer = function(mapRenderer) {};
+
+
 /**
  * @private
  */
diff --git a/src/ol/layer/layer.js b/src/ol/layer/layer.js
index 05cb5cdb8a..09886207bb 100644
--- a/src/ol/layer/layer.js
+++ b/src/ol/layer/layer.js
@@ -27,6 +27,7 @@ goog.require('ol.source.State');
  * A generic `change` event is fired when the state of the source changes.
  *
  * @constructor
+ * @abstract
  * @extends {ol.layer.Base}
  * @fires ol.render.Event
  * @param {olx.layer.LayerOptions} options Layer options.
diff --git a/src/ol/map.js b/src/ol/map.js
index 88e2265bf4..3c235faa03 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -331,7 +331,7 @@ ol.Map = function(options) {
    * @type {ol.renderer.Map}
    * @private
    */
-  this.renderer_ = new optionsInternal.rendererConstructor(this.viewport_, this);
+  this.renderer_ = new /** @type {Function} */ (optionsInternal.rendererConstructor)(this.viewport_, this);
 
   /**
    * @type {function(Event)|undefined}
diff --git a/src/ol/render/canvas/immediate.js b/src/ol/render/canvas/immediate.js
index 757b24bce5..29abefcbfa 100644
--- a/src/ol/render/canvas/immediate.js
+++ b/src/ol/render/canvas/immediate.js
@@ -397,6 +397,7 @@ ol.render.canvas.Immediate.prototype.drawRings_ = function(flatCoordinates, offs
  * the current fill and stroke styles.
  *
  * @param {ol.geom.Circle} geometry Circle geometry.
+ * @override
  * @api
  */
 ol.render.canvas.Immediate.prototype.drawCircle = function(geometry) {
@@ -437,6 +438,7 @@ ol.render.canvas.Immediate.prototype.drawCircle = function(geometry) {
  * any `zIndex` on the provided style will be ignored.
  *
  * @param {ol.style.Style} style The rendering style.
+ * @override
  * @api
  */
 ol.render.canvas.Immediate.prototype.setStyle = function(style) {
@@ -451,6 +453,7 @@ ol.render.canvas.Immediate.prototype.setStyle = function(style) {
  * {@link ol.render.canvas.Immediate#setStyle} first to set the rendering style.
  *
  * @param {ol.geom.Geometry|ol.render.Feature} geometry The geometry to render.
+ * @override
  * @api
  */
 ol.render.canvas.Immediate.prototype.drawGeometry = function(geometry) {
@@ -493,6 +496,7 @@ ol.render.canvas.Immediate.prototype.drawGeometry = function(geometry) {
  *
  * @param {ol.Feature} feature Feature.
  * @param {ol.style.Style} style Style.
+ * @override
  * @api
  */
 ol.render.canvas.Immediate.prototype.drawFeature = function(feature, style) {
@@ -511,6 +515,7 @@ ol.render.canvas.Immediate.prototype.drawFeature = function(feature, style) {
  * uses the current styles appropriate for each geometry in the collection.
  *
  * @param {ol.geom.GeometryCollection} geometry Geometry collection.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawGeometryCollection = function(geometry) {
   var geometries = geometry.getGeometriesArray();
@@ -526,6 +531,7 @@ ol.render.canvas.Immediate.prototype.drawGeometryCollection = function(geometry)
  * the current style.
  *
  * @param {ol.geom.Point|ol.render.Feature} geometry Point geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawPoint = function(geometry) {
   var flatCoordinates = geometry.getFlatCoordinates();
@@ -544,6 +550,7 @@ ol.render.canvas.Immediate.prototype.drawPoint = function(geometry) {
  * uses the current style.
  *
  * @param {ol.geom.MultiPoint|ol.render.Feature} geometry MultiPoint geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawMultiPoint = function(geometry) {
   var flatCoordinates = geometry.getFlatCoordinates();
@@ -562,6 +569,7 @@ ol.render.canvas.Immediate.prototype.drawMultiPoint = function(geometry) {
  * the current style.
  *
  * @param {ol.geom.LineString|ol.render.Feature} geometry LineString geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawLineString = function(geometry) {
   if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
@@ -589,6 +597,7 @@ ol.render.canvas.Immediate.prototype.drawLineString = function(geometry) {
  *
  * @param {ol.geom.MultiLineString|ol.render.Feature} geometry MultiLineString
  *     geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawMultiLineString = function(geometry) {
   var geometryExtent = geometry.getExtent();
@@ -622,6 +631,7 @@ ol.render.canvas.Immediate.prototype.drawMultiLineString = function(geometry) {
  * the current style.
  *
  * @param {ol.geom.Polygon|ol.render.Feature} geometry Polygon geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawPolygon = function(geometry) {
   if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
@@ -656,6 +666,7 @@ ol.render.canvas.Immediate.prototype.drawPolygon = function(geometry) {
  * Render MultiPolygon geometry into the canvas.  Rendering is immediate and
  * uses the current style.
  * @param {ol.geom.MultiPolygon} geometry MultiPolygon geometry.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.drawMultiPolygon = function(geometry) {
   if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
@@ -802,6 +813,7 @@ ol.render.canvas.Immediate.prototype.setContextTextState_ = function(textState)
  *
  * @param {ol.style.Fill} fillStyle Fill style.
  * @param {ol.style.Stroke} strokeStyle Stroke style.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.setFillStrokeStyle = function(fillStyle, strokeStyle) {
   if (!fillStyle) {
@@ -848,6 +860,7 @@ ol.render.canvas.Immediate.prototype.setFillStrokeStyle = function(fillStyle, st
  * the image style.
  *
  * @param {ol.style.Image} imageStyle Image style.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.setImageStyle = function(imageStyle) {
   if (!imageStyle) {
@@ -879,6 +892,7 @@ ol.render.canvas.Immediate.prototype.setImageStyle = function(imageStyle) {
  * remove the text style.
  *
  * @param {ol.style.Text} textStyle Text style.
+ * @override
  */
 ol.render.canvas.Immediate.prototype.setTextStyle = function(textStyle) {
   if (!textStyle) {
diff --git a/src/ol/render/replaygroup.js b/src/ol/render/replaygroup.js
index 6f7b286021..46a6a9b9a6 100644
--- a/src/ol/render/replaygroup.js
+++ b/src/ol/render/replaygroup.js
@@ -4,6 +4,7 @@ goog.provide('ol.render.ReplayGroup');
 /**
  * Base class for replay groups.
  * @constructor
+ * @abstract
  */
 ol.render.ReplayGroup = function() {};
 
diff --git a/src/ol/render/vectorcontext.js b/src/ol/render/vectorcontext.js
index 26b8fad6ce..a8974f1cc7 100644
--- a/src/ol/render/vectorcontext.js
+++ b/src/ol/render/vectorcontext.js
@@ -5,6 +5,7 @@ goog.provide('ol.render.VectorContext');
  * Context for drawing geometries.  A vector context is available on render
  * events and does not need to be constructed directly.
  * @constructor
+ * @abstract
  * @struct
  * @api
  */
@@ -15,7 +16,6 @@ ol.render.VectorContext = function() {
 /**
  * Render a geometry.
  *
- * @abstract
  * @param {ol.geom.Geometry} geometry The geometry to render.
  */
 ol.render.VectorContext.prototype.drawGeometry = function(geometry) {};
@@ -24,22 +24,19 @@ ol.render.VectorContext.prototype.drawGeometry = function(geometry) {};
 /**
  * Set the rendering style.
  *
- * @abstract
  * @param {ol.style.Style} style The rendering style.
  */
 ol.render.VectorContext.prototype.setStyle = function(style) {};
 
 
 /**
- * @abstract
  * @param {ol.geom.Circle} circleGeometry Circle geometry.
- * @param {ol.Feature} feature Feature,
+ * @param {ol.Feature} feature Feature.
  */
 ol.render.VectorContext.prototype.drawCircle = function(circleGeometry, feature) {};
 
 
 /**
- * @abstract
  * @param {ol.Feature} feature Feature.
  * @param {ol.style.Style} style Style.
  */
@@ -47,7 +44,6 @@ ol.render.VectorContext.prototype.drawFeature = function(feature, style) {};
 
 
 /**
- * @abstract
  * @param {ol.geom.GeometryCollection} geometryCollectionGeometry Geometry
  *     collection.
  * @param {ol.Feature} feature Feature.
@@ -56,7 +52,6 @@ ol.render.VectorContext.prototype.drawGeometryCollection = function(geometryColl
 
 
 /**
- * @abstract
  * @param {ol.geom.LineString|ol.render.Feature} lineStringGeometry Line
  *     string geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
@@ -65,7 +60,6 @@ ol.render.VectorContext.prototype.drawLineString = function(lineStringGeometry,
 
 
 /**
- * @abstract
  * @param {ol.geom.MultiLineString|ol.render.Feature} multiLineStringGeometry
  *     MultiLineString geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
@@ -74,7 +68,6 @@ ol.render.VectorContext.prototype.drawMultiLineString = function(multiLineString
 
 
 /**
- * @abstract
  * @param {ol.geom.MultiPoint|ol.render.Feature} multiPointGeometry MultiPoint
  *     geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
@@ -83,7 +76,6 @@ ol.render.VectorContext.prototype.drawMultiPoint = function(multiPointGeometry,
 
 
 /**
- * @abstract
  * @param {ol.geom.MultiPolygon} multiPolygonGeometry MultiPolygon geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
  */
@@ -91,7 +83,6 @@ ol.render.VectorContext.prototype.drawMultiPolygon = function(multiPolygonGeomet
 
 
 /**
- * @abstract
  * @param {ol.geom.Point|ol.render.Feature} pointGeometry Point geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
  */
@@ -99,7 +90,6 @@ ol.render.VectorContext.prototype.drawPoint = function(pointGeometry, feature) {
 
 
 /**
- * @abstract
  * @param {ol.geom.Polygon|ol.render.Feature} polygonGeometry Polygon
  *     geometry.
  * @param {ol.Feature|ol.render.Feature} feature Feature.
@@ -108,7 +98,6 @@ ol.render.VectorContext.prototype.drawPolygon = function(polygonGeometry, featur
 
 
 /**
- * @abstract
  * @param {Array.<number>} flatCoordinates Flat coordinates.
  * @param {number} offset Offset.
  * @param {number} end End.
@@ -120,7 +109,6 @@ ol.render.VectorContext.prototype.drawText = function(flatCoordinates, offset, e
 
 
 /**
- * @abstract
  * @param {ol.style.Fill} fillStyle Fill style.
  * @param {ol.style.Stroke} strokeStyle Stroke style.
  */
@@ -128,14 +116,12 @@ ol.render.VectorContext.prototype.setFillStrokeStyle = function(fillStyle, strok
 
 
 /**
- * @abstract
  * @param {ol.style.Image} imageStyle Image style.
  */
 ol.render.VectorContext.prototype.setImageStyle = function(imageStyle) {};
 
 
 /**
- * @abstract
  * @param {ol.style.Text} textStyle Text style.
  */
 ol.render.VectorContext.prototype.setTextStyle = function(textStyle) {};
diff --git a/src/ol/render/webgl/immediate.js b/src/ol/render/webgl/immediate.js
index 74f4420b18..750cb966c6 100644
--- a/src/ol/render/webgl/immediate.js
+++ b/src/ol/render/webgl/immediate.js
@@ -88,6 +88,7 @@ if (ol.ENABLE_WEBGL) {
    * any `zIndex` on the provided style will be ignored.
    *
    * @param {ol.style.Style} style The rendering style.
+   * @override
    * @api
    */
   ol.render.webgl.Immediate.prototype.setStyle = function(style) {
@@ -101,6 +102,7 @@ if (ol.ENABLE_WEBGL) {
    * {@link ol.render.webgl.Immediate#setStyle} first to set the rendering style.
    *
    * @param {ol.geom.Geometry|ol.render.Feature} geometry The geometry to render.
+   * @override
    * @api
    */
   ol.render.webgl.Immediate.prototype.drawGeometry = function(geometry) {
diff --git a/src/ol/render/webgl/replay.js b/src/ol/render/webgl/replay.js
index 5de048d50e..9e36d9a87b 100644
--- a/src/ol/render/webgl/replay.js
+++ b/src/ol/render/webgl/replay.js
@@ -12,6 +12,7 @@ if (ol.ENABLE_WEBGL) {
 
   /**
    * @constructor
+   * @abstract
    * @extends {ol.render.VectorContext}
    * @param {number} tolerance Tolerance.
    * @param {ol.Extent} maxExtent Max extent.
diff --git a/src/ol/render/webgl/replaygroup.js b/src/ol/render/webgl/replaygroup.js
index ad5e2db400..8312118ee8 100644
--- a/src/ol/render/webgl/replaygroup.js
+++ b/src/ol/render/webgl/replaygroup.js
@@ -109,6 +109,9 @@ if (ol.ENABLE_WEBGL) {
     }
     var replay = replays[replayType];
     if (replay === undefined) {
+      /**
+       * @type {Function}
+       */
       var Constructor = ol.render.webgl.ReplayGroup.BATCH_CONSTRUCTORS_[replayType];
       replay = new Constructor(this.tolerance_, this.maxExtent_);
       replays[replayType] = replay;
diff --git a/src/ol/render/webgl/textreplay.js b/src/ol/render/webgl/textreplay.js
index 733e620567..429b03a923 100644
--- a/src/ol/render/webgl/textreplay.js
+++ b/src/ol/render/webgl/textreplay.js
@@ -7,6 +7,7 @@ if (ol.ENABLE_WEBGL) {
 
   /**
    * @constructor
+   * @abstract
    * @param {number} tolerance Tolerance.
    * @param {ol.Extent} maxExtent Max extent.
    * @struct
diff --git a/src/ol/renderer/canvas/intermediatecanvas.js b/src/ol/renderer/canvas/intermediatecanvas.js
index fe915771ab..534af2d453 100644
--- a/src/ol/renderer/canvas/intermediatecanvas.js
+++ b/src/ol/renderer/canvas/intermediatecanvas.js
@@ -9,6 +9,7 @@ goog.require('ol.transform');
 
 /**
  * @constructor
+ * @abstract
  * @extends {ol.renderer.canvas.Layer}
  * @param {ol.layer.Layer} layer Layer.
  */
diff --git a/src/ol/renderer/canvas/layer.js b/src/ol/renderer/canvas/layer.js
index fecbb784f1..7ff2f07e65 100644
--- a/src/ol/renderer/canvas/layer.js
+++ b/src/ol/renderer/canvas/layer.js
@@ -13,6 +13,7 @@ goog.require('ol.transform');
 
 /**
  * @constructor
+ * @abstract
  * @extends {ol.renderer.Layer}
  * @param {ol.layer.Layer} layer Layer.
  */
diff --git a/src/ol/renderer/map.js b/src/ol/renderer/map.js
index a136ab52af..6a3373334e 100644
--- a/src/ol/renderer/map.js
+++ b/src/ol/renderer/map.js
@@ -13,6 +13,7 @@ goog.require('ol.transform');
 
 /**
  * @constructor
+ * @abstract
  * @extends {ol.Disposable}
  * @param {Element} container Container.
  * @param {ol.Map} map Map.
diff --git a/src/ol/renderer/webgl/layer.js b/src/ol/renderer/webgl/layer.js
index 40bf6fd2a6..80bd79d7e7 100644
--- a/src/ol/renderer/webgl/layer.js
+++ b/src/ol/renderer/webgl/layer.js
@@ -17,6 +17,7 @@ if (ol.ENABLE_WEBGL) {
 
   /**
    * @constructor
+   * @abstract
    * @extends {ol.renderer.Layer}
    * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
    * @param {ol.layer.Layer} layer Layer.
diff --git a/src/ol/renderer/webgl/tilelayer.js b/src/ol/renderer/webgl/tilelayer.js
index 45667be6c5..ef575668c9 100644
--- a/src/ol/renderer/webgl/tilelayer.js
+++ b/src/ol/renderer/webgl/tilelayer.js
@@ -97,15 +97,7 @@ if (ol.ENABLE_WEBGL) {
 
 
   /**
-   * Create a function that adds loaded tiles to the tile lookup.
-   * @param {ol.source.Tile} source Tile source.
-   * @param {ol.proj.Projection} projection Projection of the tiles.
-   * @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
-   *     tiles by zoom level.
-   * @return {function(number, ol.TileRange):boolean} A function that can be
-   *     called with a zoom level and a tile range to add loaded tiles to the
-   *     lookup.
-   * @protected
+   * @inheritDoc
    */
   ol.renderer.webgl.TileLayer.prototype.createLoadedTileFinder = function(source, projection, tiles) {
     var mapRenderer = this.mapRenderer;
diff --git a/src/ol/source/image.js b/src/ol/source/image.js
index e9e2383844..9e07a935ce 100644
--- a/src/ol/source/image.js
+++ b/src/ol/source/image.js
@@ -17,6 +17,7 @@ goog.require('ol.source.Source');
  * Base class for sources providing a single image.
  *
  * @constructor
+ * @abstract
  * @extends {ol.source.Source}
  * @param {ol.SourceImageOptions} options Single image source options.
  * @api
@@ -56,6 +57,7 @@ ol.inherits(ol.source.Image, ol.source.Source);
 
 /**
  * @return {Array.<number>} Resolutions.
+ * @override
  */
 ol.source.Image.prototype.getResolutions = function() {
   return this.resolutions_;
diff --git a/src/ol/source/raster.js b/src/ol/source/raster.js
index 0ef86ebe39..2ebcc06937 100644
--- a/src/ol/source/raster.js
+++ b/src/ol/source/raster.js
@@ -485,6 +485,14 @@ ol.source.Raster.Event = function(type, frameState, data) {
 ol.inherits(ol.source.Raster.Event, ol.events.Event);
 
 
+/**
+ * @override
+ */
+ol.source.Raster.prototype.getImageInternal = function() {
+  return null; // not implemented
+};
+
+
 /**
  * @enum {string}
  * @private
diff --git a/src/ol/source/source.js b/src/ol/source/source.js
index 596794566c..b5f355d687 100644
--- a/src/ol/source/source.js
+++ b/src/ol/source/source.js
@@ -16,6 +16,7 @@ goog.require('ol.source.State');
  * A generic `change` event is triggered when the state of the source changes.
  *
  * @constructor
+ * @abstract
  * @extends {ol.Object}
  * @param {ol.SourceSourceOptions} options Source options.
  * @api stable
diff --git a/src/ol/source/tile.js b/src/ol/source/tile.js
index 3873841270..32f9e6c8bb 100644
--- a/src/ol/source/tile.js
+++ b/src/ol/source/tile.js
@@ -18,6 +18,7 @@ goog.require('ol.tilegrid');
  * Base class for sources providing images divided into a tile grid.
  *
  * @constructor
+ * @abstract
  * @extends {ol.source.Source}
  * @param {ol.SourceTileOptions} options Tile source options.
  * @api
diff --git a/src/ol/source/tiledebug.js b/src/ol/source/tiledebug.js
index a62d962da0..3e301386cc 100644
--- a/src/ol/source/tiledebug.js
+++ b/src/ol/source/tiledebug.js
@@ -91,6 +91,7 @@ ol.inherits(ol.source.TileDebug.Tile_, ol.Tile);
 /**
  * Get the image element for this tile.
  * @return {HTMLCanvasElement} Image.
+ * @override
  */
 ol.source.TileDebug.Tile_.prototype.getImage = function() {
   if (this.canvas_) {
@@ -112,3 +113,9 @@ ol.source.TileDebug.Tile_.prototype.getImage = function() {
     return context.canvas;
   }
 };
+
+
+/**
+ * @override
+ */
+ol.source.TileDebug.Tile_.prototype.load = function() {};
diff --git a/src/ol/source/tileutfgrid.js b/src/ol/source/tileutfgrid.js
index f79f3e5978..0166caace1 100644
--- a/src/ol/source/tileutfgrid.js
+++ b/src/ol/source/tileutfgrid.js
@@ -320,6 +320,7 @@ ol.inherits(ol.source.TileUTFGrid.Tile_, ol.Tile);
 /**
  * Get the image element for this tile.
  * @return {Image} Image.
+ * @override
  */
 ol.source.TileUTFGrid.Tile_.prototype.getImage = function() {
   return null;
@@ -479,7 +480,7 @@ ol.source.TileUTFGrid.Tile_.prototype.onXHRError_ = function(event) {
 
 
 /**
- * Load not yet loaded URI.
+ * @override
  */
 ol.source.TileUTFGrid.Tile_.prototype.load = function() {
   if (this.preemptive_) {
diff --git a/src/ol/source/urltile.js b/src/ol/source/urltile.js
index 56768d6868..4cd74e521f 100644
--- a/src/ol/source/urltile.js
+++ b/src/ol/source/urltile.js
@@ -12,6 +12,7 @@ goog.require('ol.source.TileEventType');
  * Base class for sources providing tiles divided into a tile grid over http.
  *
  * @constructor
+ * @abstract
  * @fires ol.source.Tile.Event
  * @extends {ol.source.Tile}
  * @param {ol.SourceUrlTileOptions} options Image tile options.
diff --git a/src/ol/source/vector.js b/src/ol/source/vector.js
index 8c6315d79f..09c8704036 100644
--- a/src/ol/source/vector.js
+++ b/src/ol/source/vector.js
@@ -652,6 +652,12 @@ ol.source.Vector.prototype.getOverlaps = function() {
 };
 
 
+/**
+ * @override
+ */
+ol.source.Vector.prototype.getResolutions = function() {};
+
+
 /**
  * Get the url associated with this source.
  *
diff --git a/src/ol/style/circle.js b/src/ol/style/circle.js
index 6b67d83920..acf8512ce5 100644
--- a/src/ol/style/circle.js
+++ b/src/ol/style/circle.js
@@ -33,6 +33,7 @@ ol.inherits(ol.style.Circle, ol.style.RegularShape);
 /**
  * Clones the style.  If an atlasmanager was provided to the original style it will be used in the cloned style, too.
  * @return {ol.style.Circle} The cloned style.
+ * @override
  * @api
  */
 ol.style.Circle.prototype.clone = function() {
diff --git a/src/ol/style/icon.js b/src/ol/style/icon.js
index 1628fec65c..8a6a823940 100644
--- a/src/ol/style/icon.js
+++ b/src/ol/style/icon.js
@@ -275,6 +275,7 @@ ol.style.Icon.prototype.getColor = function() {
  * Get the image icon.
  * @param {number} pixelRatio Pixel ratio.
  * @return {Image|HTMLCanvasElement} Image or Canvas element.
+ * @override
  * @api
  */
 ol.style.Icon.prototype.getImage = function(pixelRatio) {
@@ -283,8 +284,7 @@ ol.style.Icon.prototype.getImage = function(pixelRatio) {
 
 
 /**
- * Real Image size used.
- * @return {ol.Size} Size.
+ * @override
  */
 ol.style.Icon.prototype.getImageSize = function() {
   return this.iconImage_.getSize();
@@ -292,7 +292,7 @@ ol.style.Icon.prototype.getImageSize = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.style.Icon.prototype.getHitDetectionImageSize = function() {
   return this.getImageSize();
@@ -300,7 +300,7 @@ ol.style.Icon.prototype.getHitDetectionImageSize = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.style.Icon.prototype.getImageState = function() {
   return this.iconImage_.getImageState();
@@ -308,7 +308,7 @@ ol.style.Icon.prototype.getImageState = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.style.Icon.prototype.getHitDetectionImage = function(pixelRatio) {
   return this.iconImage_.getHitDetectionImage(pixelRatio);
@@ -366,7 +366,7 @@ ol.style.Icon.prototype.getSize = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.style.Icon.prototype.listenImageChange = function(listener, thisArg) {
   return ol.events.listen(this.iconImage_, ol.events.EventType.CHANGE,
@@ -379,6 +379,7 @@ ol.style.Icon.prototype.listenImageChange = function(listener, thisArg) {
  * When rendering a feature with an icon style, the vector renderer will
  * automatically call this method. However, you might want to call this
  * method yourself for preloading or other purposes.
+ * @override
  * @api
  */
 ol.style.Icon.prototype.load = function() {
@@ -387,7 +388,7 @@ ol.style.Icon.prototype.load = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.style.Icon.prototype.unlistenImageChange = function(listener, thisArg) {
   ol.events.unlisten(this.iconImage_, ol.events.EventType.CHANGE,
diff --git a/src/ol/style/image.js b/src/ol/style/image.js
index 894a88f960..9ba000d07e 100644
--- a/src/ol/style/image.js
+++ b/src/ol/style/image.js
@@ -8,6 +8,7 @@ goog.provide('ol.style.Image');
  * {@link ol.style.RegularShape}.
  *
  * @constructor
+ * @abstract
  * @param {ol.StyleImageOptions} options Options.
  * @api
  */
diff --git a/src/ol/style/regularshape.js b/src/ol/style/regularshape.js
index e84815c68e..0303dc86a4 100644
--- a/src/ol/style/regularshape.js
+++ b/src/ol/style/regularshape.js
@@ -293,19 +293,19 @@ ol.style.RegularShape.prototype.getStroke = function() {
 /**
  * @inheritDoc
  */
-ol.style.RegularShape.prototype.listenImageChange = ol.nullFunction;
+ol.style.RegularShape.prototype.listenImageChange = function(listener, thisArg) {};
 
 
 /**
  * @inheritDoc
  */
-ol.style.RegularShape.prototype.load = ol.nullFunction;
+ol.style.RegularShape.prototype.load = function() {};
 
 
 /**
  * @inheritDoc
  */
-ol.style.RegularShape.prototype.unlistenImageChange = ol.nullFunction;
+ol.style.RegularShape.prototype.unlistenImageChange = function(listener, thisArg) {};
 
 
 /**
diff --git a/src/ol/tile.js b/src/ol/tile.js
index 33960638fd..c329c33017 100644
--- a/src/ol/tile.js
+++ b/src/ol/tile.js
@@ -11,6 +11,7 @@ goog.require('ol.events.EventType');
  * Base class for tiles.
  *
  * @constructor
+ * @abstract
  * @extends {ol.events.EventTarget}
  * @param {ol.TileCoord} tileCoord Tile coordinate.
  * @param {ol.TileState} state State.
diff --git a/src/ol/vectortile.js b/src/ol/vectortile.js
index b32e339af6..78598ff023 100644
--- a/src/ol/vectortile.js
+++ b/src/ol/vectortile.js
@@ -88,7 +88,7 @@ ol.VectorTile.prototype.getContext = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.VectorTile.prototype.getImage = function() {
   return this.replayState_.renderedTileRevision == -1 ?
@@ -139,7 +139,7 @@ ol.VectorTile.prototype.getProjection = function() {
 
 
 /**
- * Load the tile.
+ * @inheritDoc
  */
 ol.VectorTile.prototype.load = function() {
   if (this.state == ol.TileState.IDLE) {
diff --git a/src/ol/webgl/shader.js b/src/ol/webgl/shader.js
index da3ebcdc8a..7daf7ae4f8 100644
--- a/src/ol/webgl/shader.js
+++ b/src/ol/webgl/shader.js
@@ -8,6 +8,7 @@ if (ol.ENABLE_WEBGL) {
 
   /**
    * @constructor
+   * @abstract
    * @param {string} source Source.
    * @struct
    */
diff --git a/tasks/build-ext.js b/tasks/build-ext.js
index 62b9ead8c7..72b58ea039 100644
--- a/tasks/build-ext.js
+++ b/tasks/build-ext.js
@@ -58,7 +58,7 @@ function wrapModule(mod, callback) {
         'constantProperty, deprecated, duplicate, es5Strict, ' +
         'fileoverviewTags, missingProperties, nonStandardJsDocs, ' +
         'strictModuleDepCheck, suspiciousCode, undefinedNames, ' +
-        'undefinedVars, unknownDefines, uselessCode, visibility}\n' +
+        'undefinedVars, unknownDefines, unusedLocalVariables, uselessCode, visibility}\n' +
         ' */\n' + code + '\n' +
         'ol.ext.' + mod.name + ' = module.exports;\n' +
         '})();\n';