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Fig. 4 —Sample Web page from a teaching file written by the author.
The yellow banner at the top of the page (black arrow) notifies the
user that ActiveX (Microsoft) content (i.e., the ability to scroll) has been
blocked by the browser. Clicking on this banner allows the user to allow the
content. Also, notice the organization of the teaching file as evidenced in
the address bar (white arrow). This organization is discussed in
Figure 3.
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