An HTML scrollbar is a user interface element that allows users to shift the visible area of an HTML document. It can be generated automatically or forced to be displayed or hidden with HTML code and CSS. It has a general appearance of the default system scrollbar GUI element and can be manipulated by clicking arrows or dragging the visible indicator box. It can be customized with CSS and scripting languages.
An HTML (HyperText Markup Language) scrollbar is a user interface element that can appear within the viewable frame displaying an HTML document. Allows a user to shift the visible area by one area of the screen while leaving the surrounding areas intact. In many cases, an HTML scrollbar can be generated automatically by the HTML document viewer, although some HTML code and cascading style sheets (CSS) can force a scrollbar to be displayed or hide one. Within a web page, an HTML scrollbar can be a defined formatting fix for content overflow, or it can be a property that can be set on the frames displayed in the main window. It is important to note that an HTML scrollbar that appears within a rendered HTML document is different from the scrollbar element of the operating system graphical user interface (GUI) controlled by the web browser, although some operations may also change the look of the browser’s scrollbar.
When displayed within an HTML document, an HTML scrollbar has the general appearance of the default system scrollbar GUI element. It is usually a vertical or horizontal bar with arrows placed on each end. The bar, also called the track, then has a box at the top that represents the currently viewed area of the document or larger area. The scroll bar can be manipulated by clicking the arrows with the mouse cursor to move the displayed area or by directly dragging the visible indicator box along the trace.
When an area such as a frame is defined in HTML or with CSS, the expected amount of space in pixels is sometimes not available due to a different screen resolution or window size. This causes an overflow, which means that text, images and other elements cannot be fully displayed in the available space. One behavior that can be specified in an HTML document is for the renderer to create an HTML scrollbar so that a user can navigate to different non-visible parts of the area in a limited space. Alternatively, the scrollbar can be disabled, meaning that if only part of an image or block of text is being viewed, the non-visible areas will simply not be displayed and no indication of their existence will be apparent.
Through the use of CSS, an HTML scrollbar can have its own customized look. This usually means changing the sequence of colors that are used to draw the bar, its highlights and shadows. With the use of scripting languages and some non-standard code, the actual graphics used to display an HTML scrollbar can be changed for a more customized look, although not all browsers or operating systems support this feature.
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