How do you reverse an image in HTML code?

I'm writing several pages for an HTML project, and I'm trying to figure out how to reverse one of the images so that it makes sort of a mirror screen. Does anyone know what kind of tag I have to use?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia��).