This zone uses the High template by default and cannot be lowered using the slider, although custom levels can be applied. If you apply a custom level in Windows 10, you will receive a warning notification. Any website that you believe may cause harm, or has done so in the past, should be added to this zone. As well as preventing potentially malicious functions to run on the website, this zone will also warn users if they are downloading potentially malicious content. This zone doesn't have an option that allows you to enforce the use of HTTPS.