Proprietary & Nonstandard Elements

The following elements are not actually deprecated. If something is deprecated it means that it has, at some point, been defined in a standard but was removed from a later version of the standard. However, none of the elements below have ever been defined by any standards, but were rather added on as ‘features’ by browser vendors. Some never caught on (wbr, nobr), while others are very well supported to this day across a wide range of browsers (embed, marquee). Regardless of their level of support, their use is discouraged, wherever practically possible, in favor of using elements that are part of a W3C-approved standard.

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