Defering javascript - what is the correct html syntax defer or defer=“defer”

Question

What is the correct syntax for using the defer attribute in your javascript?

I have seen it done two ways:

1:

Answer 1

Since you reference HTML 4.01:

This is a Boolean Attribute. Both forms are correct, but the specification recommends the former.

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If you were using XHTML then you would have to use the longer version.

HTML 5 also allows both versions and removes the recommendation to use one over the other (since for compatibility with XHTML served as text/html, all modern browsers can handle both syntaxes).