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https://www.w3schools.com/tags/att_script_defer.asp
The defer attribute is a boolean attribute. When present, it specifies that the script is executed when the page has finished parsing. Note: The defer attribute is only for external scripts (should only be used if the src attribute is present). Note: There are several ways an external script can be executed:
https://stackoverflow.com/questions/42985437/correctly-adding-defer-attribute-to-script-tag-with-pure-javascript
I would change it to: script.setAttribute("defer", "defer"); They usually behave the same (although the docs technically state the value of an attribute such as defer should not be "true" or false") - or at least in any browser I've used boolean attributes in.
https://apimirror.com/browser_support_tables/script-defer
browser_support_tables defer attribute for external scripts. The boolean defer attribute on script elements allows the external JavaScript file to run when the …
https://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html
Support. IE9 and below have some pretty bad bugs in their implementation of defer such that the execution order isn’t guaranteed. If you need to support <= IE9 I recommend not using defer at all and include your scripts with no attribute if the execution order matters. Read the specifics here.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
Scripts with the defer attribute will execute in the order in which they appear in the document.. This attribute allows the elimination of parser-blocking JavaScript where the browser would have to load and evaluate scripts before continuing to parse. async has a similar effect in this case. integrity This attribute contains inline metadata that a user agent can use to verify that a fetched ...
https://www.w3schools.com/tags/att_script_async.asp
The async attribute is a boolean attribute. When present, it specifies that the script will be executed asynchronously as soon as it is available. Note: The async attribute is only for external scripts (and should only be used if the src attribute is present).
https://api.jquery.com/category/deferred-object/
The Deferred object, introduced in jQuery 1.5, is a chainable utility object created by calling the jQuery.Deferred() method. It can register multiple callbacks into callback queues, invoke callback queues, and relay the success or failure state of any synchronous or asynchronous function.
https://www.w3schools.com/jsref/prop_script_defer.asp
The defer property sets or returns whether a script should be executed when a page has finished parsing, or not. This property reflects the defer attribute of the <script> tag. Note: The defer attribute is only for external scripts (and should only be used if the src attribute is present).
https://wordpress.org/plugins/async-javascript/
Async JavaScript gives you full control of which scripts to add an ‘async’ or ‘defer’ attribute to or to exclude to help increase the performance of your WordPress website. Installation Upload the zip-file and unzip it in the /wp-content/plugins/ directory
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