Regarding the use of popups in a web-based math text book:
There are two problems that need to be considered:
1. Oclusion: Where will the pop up open? Will it occluded the problem?
2. One or many popups: Will there be one pop-up per example, or will the
user need to choose which of the pop-ups to open?
Yaron Shlomi
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About CHI-WEB: http://www.acm.org/sigchi/web/chi-web.html
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