Question

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HTML5 <script> declarations

I’ve heard a few people say that you don’t need to specify a type="text/javascript" in a <script> tag, as this is the default type.

Is there any downside if I open my script tags as <script> instead of the more verbose <script type="text/javascript">?

Answer 1

In HTML4 the type attribute is required:

http://www.w3.org/TR/html401/interact/scripts.html#h-18.2.1

In HTML5 it is not.

http://dev.w3.org/html5/markup/script.html

If you are going to use HTML4, then good practice certainly includes adhering to its specifications. If you’re using HTML5, then it’s pretty clear that <script> without a type is text/javascript, so you can safely omit it.