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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
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 <div> in conjunction with CSS columns.
Browser compatibility
This non-standard element is not supported in any major browser.
Note that up to Firefox 22, though not supported, a <multicol> element was associated with the HTMLSpanElement interface. It was then fixed and is now associated with the HTMLUnknownElement interface as requested by the specification.
See also
- CSS columns: The correct technology to use for multi-column layouts
- Using CSS multi-column layouts