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# jQuery UI API Category - UI Core Features provided by jquery.ui.core.js. | API | Description | Also Belongs to Category | | :--- | :--- | :--- | | [:data() Selector](#) | Selects elements where data is stored under a specified key. | (#) | | [.disableSelection()](#) | Disables selection of text content within matched elements. | (#) | | [.enableSelection()](#) | Enables selection of text content within matched elements. | (#) | | [.focus()](#) | Asynchronously focuses an element. | (#) | (#) | | [:focusable Selector](#) | Selects elements that can be focused. | (#) | | [jQuery.ui.keyCode](#) | A mapping of key code descriptions to their numeric values. | | | [.removeUniqueId()](#) | Removes the Id set by .uniqueId() from matched elements. | (#) | | [.scrollParent()](#) | Gets the closest scrollable ancestor. | (#) | | [:tabbable Selector](#) | Selects elements that can be focused by the user via the tab key. | (#) | | [.uniqueId()](#) | Generates and applies a unique Id to matched elements. | (#) | | [.zIndex()](#) | Gets the z-index for an element. | (#) | [](#)[jQuery UI API Category – Theming](#) [jQuery UI API Category – Utilities](#)[](#)