HTML anchor tel tag formating

Question

I have a small question about the anchor tel: tag in HTML.

Is this valid, or are there any standards on how to write it properly?

<a href="tel:+358 50 11 22 33"></a>

It has bugged me about the spaces and the prefix, are they allowed?

Answer 1

The standards pretty much say that you can't have spaces. So this:

<a href="tel:+358 50 11 22 33"></a>

Is valid HTML.