I want to add the
async attribute to a script tag in the
<head> block. I've successfully added the script tag to the
default_head_blocks.xml file in
Magento_Theme as per the example in the Devdocs, but can't work out how to add an additional attribute to the tag with Magento 2.
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js" src_type="url" async="async"/>
but this doesn't work.