This feature relies on URL.createObjectURL, which is supported by
- Firefox 4
- Chrome 8
- Opera 15
- Internet Explorer 10
If the feature is missing, it falls back to downloading from the server.
The environment-specific code are put in ifdef's. Two methods are
defined:
- noData
This function is used as a fallback in case of failure, it triggers
a download directly from the server.
- triggerSaveAs(String url, optional String blob)
This function attempts to show a Save As dialog for a given URL.
It attempts to use the a.download attribute, if available, and
falls back to window.open(<url>, '_parent') if unavailable.
See also http://caniuse.com/download
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