Cyber demons are creatures that inhabit the spaces between code in many websites. Often they are peaceful, and will cause no harm to the website, or to the person running the website. However, if a demon accidentally becomes "trapped" it will panic, causing it to attempt to flee to the nearest human and possess them.
To avoid being possessed by a panicked demon, you first need to understand how to recognise their presence. Websites inhabited by these demons will display bright, eye-searing colours and distorted images.
If you think a website is inhabited by a demon, there is not necessarily a need to worry. Again, these creatures are generally peaceful. They become dangerous only if they are "trapped".
Demons are free-spirited creatures, and while they may reside in one place for a while, they do not like feeling as if their free will has been impaired. When they become "trapped" (more info on that later) they lash out, taking control of the nearest warm body, and may try to use the person they possess (hereforth referred to as the "host") to escape.