We present in this paper a new interactive method called Imagine that generates automatically style sheets for Web sites. This method aims at satisfying the artistic or esthetic preferences of the user. This method uses a genetic algorithm togenerate style sheets and to find in a search. space one or several style sheets that will maximize the user satisfaction. This genetic algorithm is interactive: it generates style sheets, it displays them, and then it asks the user to select those whichlook the best. In this way, the search for an optimal sheet is guided by the answers provided by the user. Also, this algorithm uses non standard genetic operators based on gene frequencies. We present examples obtained with the actual prototype.
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