Update useCORS documentation (Fix #1323)

docs/configuration.md

@@ -21,6 +21,7 @@ These are all of the available configuration options.
 | proxy | `null` | Url to the [proxy](/proxy/) which is to be used for loading cross-origin images. If left empty, cross-origin images won't be loaded.
 | removeContainer | `true` | Whether to cleanup the cloned DOM elements html2canvas creates temporarily
 | scale | `window.devicePixelRatio` | The scale to use for rendering. Defaults to the browsers device pixel ratio.
+| useCORS | `false` | Whether to attempt to load images from a server using CORS
 | width | `Element` width | The width of the `canvas`
 | height | `Element` height | The height of the `canvas`
 | x | `Element` x-offset | Crop canvas x-coordinate

src/Clone.js

@@ -182,6 +182,7 @@ export class DocumentCloner {
                             removeContainer: this.options.removeContainer,
                             scale: this.options.scale,
                             foreignObjectRendering: this.options.foreignObjectRendering,
+                            useCORS: this.options.useCORS,
                             target: new CanvasRenderer(),
                             width,
                             height,

src/index.js

@@ -20,6 +20,7 @@ export type Options = {
     removeContainer: ?boolean,
     scale: number,
     target: RenderTarget<*>,
+    useCORS: boolean,
     width: number,
     height: number,
     x: number,
@@ -72,6 +73,7 @@ const html2canvas = (element: HTMLElement, conf: ?Options): Promise<*> => {
         foreignObjectRendering: false,
         scale: defaultView.devicePixelRatio || 1,
         target: new CanvasRenderer(config.canvas),
+        useCORS: false,
         x: left,
         y: top,
         width: Math.ceil(width),