How do I Invoke Save As... dialogue?

Is there a way to invoke a download with a system/browser file chooser dialogue?

You can do that with the browser object. There's a download action. Also with nwjs exports the nwjs object has save dialogs.

With the browser object, it immediately downloads the file with the filename set in the action and to the browser's download directory without prompting. Maybe it's a Chrome setting as the default action...

I'm looking for an action that simulates the Right click on link -> Save As... functionality.

A quick google search looks like there's a setting in chrome where you can have it ask where to save files each time. Otherwise it looks like a browser controlled behavior, not something you can control from javascript in a html5 export.

I even checked C3 which would likely have this were it possible. No dice.