jQuery Tools
jQuery Tools became part of Plone with 4.0 (and maybe added to Plone 3.x via plone.app.jquerytools).
Use jQuery Tools for tabs, tooltips, overlays, masking and scrollables.
Masking, in which most of the page is shaded in order to highlight the part of the page that most needs attention, should be minimized — though we do use masking for popup forms in order to emphasize their modal character.

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