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Reference
Glossary
FilterA filter is a program that receives a specified kind of data, then
manipulates and outputs the results. Visual filters as a part of dHTML
modify the appearance of a control. In fact, a visual filter can have
complete authority over the control's visual output. An Alpha filter, for
example, can control the opacity of its target, while the author controls
the amount of opacity expressed as a percentage. Currently, visual filters
are only supported by Microsoft Internet Explorer.
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