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Hover and focus events should not obscure content and should be dismissible.
Content that appears and disappears in coordination with keyboard focus or pointer hover, such as custom tooltips, sub-menus, overlays and other non-modal popups, often lead to accessibility issues. Therefore, content that appears and disappears on hover or focus must be designed in a way that meets the following conditions:
This guideline does not apply to custom modal dialogs since they are typically triggered on click events and content that is controlled by the user agent (such as a tooltip displayed via the HTML title attribute) and is not modified by the author.