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Website navigation menus often include dropdown or flyout menus, where submenus are hidden by default and appear visibly when mouse users hover over or click a top-level menu item. These sorts of menus can major present accessibility challenges for many groups of users unless they are coded properly.
The University of Washington's Technology Accessibility Specialist Terrill Thompson has explored this problem in depth and provides recommendations in his blog post Accessible Dropdown Menus Revisited.