我们如何限制用户点击或打开浏览器窗口直到他们关闭打开的弹出窗口?

I am making a web application which takes the exam related programming languages, and i am opening a pop up window for test when a user click to start a test , but i want to restrict them to go on the main broweser window until they submit the exam(pope up window closed automatically) or they will close manualyI am making a web application which takes the e