Can I just add “async” to make a script load asynchronously?

For example, I use Skimlinks on my website, and the code is:

Code (Text):

<script type="text/javascript" src="//s.skimresources.com/js/67963X1515853.skimlinks.js"></script>

Can I just change that to the following to make it […]

See original post by invalid@example.com (asabet)