If you are an Internet Explorer user than hopefully you don’t place valuable data on your clipboard. A default option in Internet Explorer allows Web sites to access your clipboard without any user intervention. You can easily disable Web sites from having access to this information by following these two steps:
- Go to Tools -> Internet Options -> Security
- Click on the Custom Level Security Setting and uncheck the option “Allow Paste Operations via Script.“
Once you performed those two steps above then you should get an “undefined” result from this test. If you use a browser besides Internet Explorer then you don’t have to worry because this only affects Internet Explorer, like always.