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Summary
The HTML <multicol>
element was an experimental element designed to allow multi-column layouts. It never got any significant traction and is not implemented in any major browsers.
Do not use this! In order to implement a multi-column layout, you should be using the regular HTML elements, like {{HTMLElement("div")}} in conjounction with the CSS Column feature.
Note that up to Firefox 22, though not supported, a <multicol>
element was associated with an {{domxref("HTMLSpanElement")}}. It was then fixed and is now associationd with a {{domxref("HTMLUnknownElement")}} as requested by the specification.