Trying to print an opened document from “onlyoffice documentserver” within the web interface is blocked with the following message in the console tab of the chrome developer tools.
Uncaught DOMException: Blocked a frame with origin “https://my-serverFQDN” from accessing a cross-origin frame.
at HTMLIFrameElement.iframePrint.onload (https://my-serverFQDN/onlyofficeds/5.3.4-3//web-apps/apps/documenteditor/main/app.js:55:10495)
which prevent it of printing the document. the only option is to download and save the document and then to print using other tools which is unpleasant a little bit.