Function downloadCanvasElement

downloadCanvasElement(
    element?: null | HTMLElement,
    fileName?: string,
    imageType?: string,
    imageQuality?: number,
): void
Popup a download dialog by creating a fake download link, as image format
Parameters
- Optionalelement: null | HTMLElement
  The element to download
- OptionalfileName: string
  The default file name to save, when popup the download dialog
- imageType: string = 'image/png'
  A string indicating the image format. The default type is image/png
- imageQuality: number = 0.8
  A Number between 0 and 1 indicating the image quality to be used when creating images using file formats that support lossy compression (such as image/jpeg or image/webp)
Returns void
See
"https://developer.mozilla.org/docs/Web/API/HTMLCanvasElement/toDataURL"