2012-08-28 UTC
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tantek the element with class="value-title" MUST be the first child of the element you're using for the microformats property, and in order for the tooltip to not display / be spoken, you must put only a plain space " " in that first child span. The plain space *is* required for maximum robustness with various markup transformation systems/services, e.g. Tidy, some CMSs etc.