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See ReportHover 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.