HTML and CSS Reference
your desktop. This technique has some legitimate uses, such as popping up an informa-
tion window containing a larger picture and description of a product when the user
clicks on the product in the main window. Unfortunately, the use of popup windows
has been so abused that most browsers allow users to disable popup windows. This also
means that the useful popup windows are not displayed. Figure 14.2 shows a popup
window that appears when the user clicks the link in the main page.
The smaller popup
when the user clicks
the link in the larger
Detecting the exact Web browser application and version is called browser sniffing and
is sometimes important to the Web developer for determining appropriate features.
about the user's browser.
select a Web page from a select list, and click a button to load the selected Web page.
Figure 14.4 shows this technique.