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Marquee element
The marquee tag is a non-standard HTML element which causes text to scroll up, down, left or right automatically. The tag was first introduced in early versions of Microsoft's Internet Explorer, and was compared to Netscape's blink element, as a proprietary non-standard extension to the HTML standard with usability problems. The W3C advises against its use in HTML documents.
== Usability problems ==
Marquee can be distracting. The human eye is attracted to movement, and marquee text is constantly moving.
As with the blink element, because the marquee tagged images or text are not always completely visible, it can make printing such webpages to a paper hard-copy an impossible and inefficient task where the specific printed pages where the messages on screen scroll or blink have to be printed multiple times to capture all the pieces of text that could be displayed at any one given moment in time. The behavior="alternate" version of marquee makes text jitter back and forth but does not obscure any part of it if scrolling widths are set correctly.
Because marquee text moves, links within it are more difficult to click than those in static text, depending on the speed and length of the scrolling. Users only get one chance every time it scrolls past. Also, scrolling text too fast can make it unreadable to some people, particularly those with visual impairments. This can easily frustrate users. To combat this, most client-side scripting allows marquees to be programmed to stop when the mouse is over them.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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