You can also create a new window visible only on the taskbar using this workaround:
window.open(path.html,'_blank', 'toolbar=no,status=no,menubar=no,scrollbars=no,resizable=no,left=10000, top=10000, width=10, height=10, visible=none', '');
which open the window at a position not visible to the user. I used this trick at different times.
Tonino
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