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> Javascript has no way to output data that is then saved to disk.

First, there's HTML5 window.saveAs which apparently nobody has implemented. Second, you can always fall back to some swf.

http://stackoverflow.com/questions/2897619/using-html5-javas...



https://github.com/eligrey/FileSaver.js

FileSaver.js implements the W3C saveAs() FileSaver interface in browsers that do not natively support it.

No IE support, but what’s the intersection of Mega users and IE users?


People routinely download GB+ messages - neither of those options are practical for files of that size.




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