Can an html element have multiple ids?

Question

I understand that an id must be unique within an HTML/XHTML page.

My question is, for a given element, can I assign multiple ids to it?

Answer 1

My understanding has always been:

• ID's are single use and are only applied to one element...

  • Each is attributed as a Unique Identifier to (only) one single element.

• Classes can be used more than once...

  • They can therefore be applied to more than one element, and similarly yet different, there can be more than one class (i.e. multiple classes) per element.