diff --git a/examples/device-orientation.html b/examples/device-orientation.html
index 1b1a3d87c4..02ae67bf07 100644
--- a/examples/device-orientation.html
+++ b/examples/device-orientation.html
@@ -8,7 +8,7 @@ docs: >
   normalize the events from the browser.
 tags: "device, orientation, gyronorm"
 resources:
-  - https://cdn.rawgit.com/dorukeker/gyronorm.js/v2.0.6/dist/gyronorm.complete.min.js
+  - https://unpkg.com/gyronorm@2.0.6/dist/gyronorm.complete.min.js
 ---
 <div id="map" class="map"></div>
 <p>
diff --git a/examples/jsts.html b/examples/jsts.html
index 937e08a818..bb6db6f424 100644
--- a/examples/jsts.html
+++ b/examples/jsts.html
@@ -7,6 +7,6 @@ docs: >
   with OpenLayers.
 tags: "vector, jsts, buffer"
 resources:
-  - https://cdn.rawgit.com/bjornharrtell/jsts/gh-pages/1.6.0/jsts.min.js
+  - https://unpkg.com/jsts@2.0.2/dist/jsts.min.js
 ---
 <div id="map" class="map"></div>
diff --git a/examples/resources/mapbox-streets-v6-style.js b/examples/resources/mapbox-streets-v6-style.js
index c19a63be25..eb9b496c87 100644
--- a/examples/resources/mapbox-streets-v6-style.js
+++ b/examples/resources/mapbox-streets-v6-style.js
@@ -15,7 +15,7 @@ function createMapboxStreetsV6Style(Style, Fill, Stroke, Icon, Text) {
     var icon = iconCache[iconName];
     if (!icon) {
       icon = new Style({image: new Icon({
-        src: 'https://cdn.rawgit.com/mapbox/maki/master/icons/' + iconName + '-15.svg',
+        src: 'https://unpkg.com/@mapbox/maki@4.0.0/icons/' + iconName + '-15.svg',
         imgSize: [15, 15]
       })});
       iconCache[iconName] = icon;
diff --git a/examples/topolis.html b/examples/topolis.html
index cb02eb4ce3..396d380ba0 100644
--- a/examples/topolis.html
+++ b/examples/topolis.html
@@ -7,7 +7,7 @@ docs: >
   with OpenLayers, enabling creating and editing topological geometry. Standard interaction draws edges, snapping to existing edges. Delete an edge by drawing a new edge crossing the one to delete.
 tags: "draw, edit, vector, topology, topolis"
 resources:
-  - https://cdn.rawgit.com/bjornharrtell/topolis/releases/0.1.1/topolis.min.js
+  - https://unpkg.com/topolis@0.2.5/dist/topolis.js
   - https://code.jquery.com/jquery-3.1.1.min.js
   - https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.js
   - https://cdnjs.cloudflare.com/ajax/libs/toastr.js/2.1.3/toastr.min.css
diff --git a/src/ol/TileRange.js b/src/ol/TileRange.js
index af137bd4a1..e2cf3b37ca 100644
--- a/src/ol/TileRange.js
+++ b/src/ol/TileRange.js
@@ -92,30 +92,30 @@ class TileRange {
   }
 
   /**
-  * @return {number} Height.
-  */
+   * @return {number} Height.
+   */
   getHeight() {
     return this.maxY - this.minY + 1;
   }
 
   /**
-  * @return {import("./size.js").Size} Size.
-  */
+   * @return {import("./size.js").Size} Size.
+   */
   getSize() {
     return [this.getWidth(), this.getHeight()];
   }
 
   /**
-  * @return {number} Width.
-  */
+   * @return {number} Width.
+   */
   getWidth() {
     return this.maxX - this.minX + 1;
   }
 
   /**
-  * @param {TileRange} tileRange Tile range.
-  * @return {boolean} Intersects.
-  */
+   * @param {TileRange} tileRange Tile range.
+   * @return {boolean} Intersects.
+   */
   intersects(tileRange) {
     return this.minX <= tileRange.maxX &&
        this.maxX >= tileRange.minX &&
diff --git a/src/ol/source/Source.js b/src/ol/source/Source.js
index 858c0e9d9c..8aac80563b 100644
--- a/src/ol/source/Source.js
+++ b/src/ol/source/Source.js
@@ -32,8 +32,8 @@ import SourceState from './State.js';
  * @typedef {Object} Options
  * @property {AttributionLike} [attributions]
  * @property {import("../proj.js").ProjectionLike} projection
- * @property {SourceState} [state]
- * @property {boolean} [wrapX]
+ * @property {SourceState} [state='ready']
+ * @property {boolean} [wrapX=false]
  */
 
 
@@ -64,7 +64,7 @@ class Source extends BaseObject {
      * @private
      * @type {?Attribution}
      */
-    this.attributions_ = this.adaptAttributions_(options.attributions);
+    this.attributions_ = adaptAttributions(options.attributions);
 
     /**
      * This source is currently loading data. Sources that defer loading to the
@@ -88,30 +88,6 @@ class Source extends BaseObject {
 
   }
 
-  /**
-   * Turns the attributions option into an attributions function.
-   * @param {AttributionLike|undefined} attributionLike The attribution option.
-   * @return {?Attribution} An attribution function (or null).
-   */
-  adaptAttributions_(attributionLike) {
-    if (!attributionLike) {
-      return null;
-    }
-    if (Array.isArray(attributionLike)) {
-      return function(frameState) {
-        return attributionLike;
-      };
-    }
-
-    if (typeof attributionLike === 'function') {
-      return attributionLike;
-    }
-
-    return function(frameState) {
-      return [attributionLike];
-    };
-  }
-
   /**
    * Get the attribution function for the source.
    * @return {?Attribution} Attribution function.
@@ -167,7 +143,7 @@ class Source extends BaseObject {
    * @api
    */
   setAttributions(attributions) {
-    this.attributions_ = this.adaptAttributions_(attributions);
+    this.attributions_ = adaptAttributions(attributions);
     this.changed();
   }
 
@@ -195,4 +171,29 @@ class Source extends BaseObject {
 Source.prototype.forEachFeatureAtCoordinate = VOID;
 
 
+/**
+ * Turns the attributions option into an attributions function.
+ * @param {AttributionLike|undefined} attributionLike The attribution option.
+ * @return {?Attribution} An attribution function (or null).
+ */
+function adaptAttributions(attributionLike) {
+  if (!attributionLike) {
+    return null;
+  }
+  if (Array.isArray(attributionLike)) {
+    return function(frameState) {
+      return attributionLike;
+    };
+  }
+
+  if (typeof attributionLike === 'function') {
+    return attributionLike;
+  }
+
+  return function(frameState) {
+    return [attributionLike];
+  };
+}
+
+
 export default Source;