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| Pop-up
ad
Pop-up ads or popups are a form of online advertising on the
World Wide Web intended to increase web traffic or capture
email addresses. It works when certain web sites open a new
web browser window to display advertisements. The pop-up window
containing an advertisement is usually generated by JavaScript,
but can be generated by other means as well.
Pop-up blocking
Opera was the first major browser to incorporate tools to
block pop-up ads; the Mozilla browser later improved on this
by blocking only pop-ups generated as the page loads. In the
early 2000s, all major web browsers except Internet Explorer
allowed the user to block unwanted pop-ups almost completely.
In 2004, Microsoft released Windows XP SP2, which added pop-up
blocking to Internet Explorer.
Most modern browsers come with pop-up blocking tools; third-party
tools tend to include other features such as ad filtering.
Blocking of legitimate
"pop-ups"
In some cases a pop-up is desirable and problems can arise
when they are inappropriately blocked.
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· Many websites use pop-ups to display information
without disrupting the page currently open. For example, if you
were to fill in a form on a web page and needed extra guidance,
a pop-up would give you extra information without losing any information
already entered into the form. Most pop-up blockers will allow this
kind of pop-up, however, some will reload the page, losing any information
that was entered.
· Some web based installers such as that
used by McAfee use a pop-up to install software.
· On many internet browsers, holding down
the ctrl key while clicking a link will allow it to bypass the popup
filter.
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