A web wart is a type of Modal, Popup, Drop-down, Slide-in, Banner, Useless widget or other Annoying element that comes to greet you on your visit to a web page; there are many shapes and sizes. First time visitors are particularly susceptible to wart attacks. Many such warts can be removed by striking their weak spot, often a small [x]. If you do not pay attention to them, they persist, eat page space and proliferate. Web warts tend to reappear after a few days and can be hard to fully get rid of. Some you cannot remove, and some of those even tag along as you scroll the page.
A very common type of web wart is the Cookie Monster Modal that begs of you to Accept all. Such warts offer several options for you to annihilate them, but if you do not choose their own preferred way of dying, they will often come back the next day or next week or next month.
Every day the warts of the web increase in numbers. Landing on a new web site is like encountering an impenetrable wall of weeds. Your mission, should you choose to accept it, is to whack it all away, equipped with a pointy weapon. More often than not, your best bet is to just leave. There are many sources of truth these days.
I hate Web Warts.