when you open the website, a full-screen window pops up with a simple description - you can't close it or use the website because there is no such feature
[Re-Titled by Moderator]
Original Title: pop-up windows in safari
Block pop-up ads and windows in Safari - Apple Support describes Safari's built-in feature.
Are you encountering the following perhaps?
Phony "tech support" / "ransomware" popups and web pages - Apple Community
They can monopolize an entire screen and make Safari appear to be unresponsive.
What web site?
Full-screen pop-up window blocks Safari website access
