Where jquery-ui-1.x.x.custom.min.js plugin come from ？

http://jqueryui.com/download/#!version=1.10.4 Download Builder Quick downloads: Stable (Themes) (1.12.1: for jQuery1.7+) | Legacy (Themes) (1.11.4: for jQuery1.6+) | Legacy (Themes) (1.10.4: for jQuery1.6+) | Legacy (Themes) (1.9.2: for jQuery1.6+) All jQuery UI Downloads   Version 1.12.1(Stable, for jQuery1.7+) 1.11.4(Legacy, for jQuery1.6+) 1.10.4(Legacy, for jQuery1.6+) 1.9.2(Legacy, for jQuery1.6+) Components  Toggle All UI Core  Toggle All A required dependency, contains basic functions and initializers. CoreThe core of jQuery UI, required for all interactions and widgets. WidgetProvides a factory for creating stateful widgets with a common API. MouseAbstracts mouse-based interactions to assist in creating certain widgets. PositionPositions elements relative to other elements. Interactions  Toggle All These add basic behaviors to any element and are used by many components below. DraggableEnables dragging functionality for any element. DroppableEnables drop targets for draggable elements. ResizableEnables resize functionality for any element. SelectableAllows groups of elements to be selected with the mouse. SortableEnables items in a list to be sorted using the mouse. Widgets  Toggle All Full-featured UI Controls - each has a range of options and is fully themeable. AccordionDisplays collapsible content panels for presenting information in a limited amount of space. AutocompleteLists suggested words as the user is typing. ButtonEnhances a form with themeable buttons. DatepickerDisplays a calendar from an input or inline for selecting dates. DialogDisplays customizable dialog windows. MenuCreates nestable menus. ProgressbarDisplays a status indicator for loading state, standard percentage, and other progress indicators. SliderDisplays a flexible slider with ranges and accessibility via keyboard. SpinnerDisplays buttons to easily input numbers via the keyboard or mouse. TabsTransforms a set of container elements into a tab structure. TooltipShows additional information for any element on hover or focus. Effects  Toggle All A rich effect API and ready to use effects. Effects CoreExtends the internal jQuery effects. Includes morphing and easing. Required by all other effects. Blind EffectBlinds the element. Bounce EffectBounces an element horizontally or vertically n times. Clip EffectClips the element on and off like an old TV. Drop EffectMoves an element in one direction and hides it at the same time. Explode EffectExplodes an element in all directions into n pieces. Implodes an element to its original wholeness. Fade EffectFades an element. Fold EffectFolds an element first horizontally and then vertically. Highlight EffectHighlights the background of an element in a defined color for a custom duration. Pulsate EffectPulsates an element n times by changing the opacity to zero and back. Scale EffectGrows or shrinks an element and its content. Restores an elemnt to its original size. Shake EffectShakes an element horizontally or vertically n times. Slide EffectSlides an element in and out of the viewport. Transfer EffectDisplays a transfer effect from one element to another. Theme Select the theme you want to include or design a custom theme   No Theme   Base   UI lightness   UI darkness   Smoothness   Start   Redmond   Sunny   Overcast   Le Frog   Flick   Pepper Grinder   Eggplant   Dark Hive   Cupertino   South Street   Blitzer   Humanity   Hot Sneaks   Excite Bike   Vader   Dot Luv   Mint Choc   Black Tie   Trontastic   Swanky Purse   Theme Folder Name: CSS Scope: If you're having trouble downloading a custom package or theme, please report the issue on GitHub. .