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Blocking Pop-ups

Pop-ups are ads that are displayed in their own browser windows. There are two classes of pop-up ads: a pop-up, which displays on top of everything and has focus, and a pop-under, which is placed behind the browser, lurking and waiting for you to find it later. The logic behind pop-under ads is that you might not know from which site they originated. In this chapter we’ll refer to both as pop-up ads, even though some are pop-unders.

Another related technique is called a pop-over. These ads are displayed using JavaScript and are part of the web page (no separate browser window). Pop-overs are usually animated, covering the content you want to see.


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