Test embed: Office Viewer + Google Docs Viewer

Microsoft Office Viewer (Office Online)

Embed URL: https://view.officeapps.live.com/op/embed.aspx?src=https%3A%2F%2Fu412156.stronazen.pl%2FKopiaEMUaktualne.xlsx

Embed URL: https://docs.google.com/viewer?url=https%3A%2F%2Fu412156.stronazen.pl%2FKopiaEMUaktualne.xlsx&embedded=true