"When authors use the
canvaselement, they must also provide content that, when presented to the user, conveys essentially the same function or purpose as the bitmap
canvas. This content may be placed as content of the
canvaselement. The contents of the
canvaselement, if any, are the element's fallback content." - WHATWG HTML5 Specification
What happens if someone viewing your brilliant new
canvas application is using an older browser and is unable to recognize your coding genius? Or what happens when someone uses assistive technologies? Let's take a look.
If, for some reason, a user's browser won't support the new
canvas element, it's up to us as developers to give them something valuable instead.