Async scripts will download the script without blocking rendering the page and will execute it as soon as the script finishes downloading. You get no guarantee that scripts will run in any specific order, only that they will not stop the rest of the page from displaying. It is best to use
asyncwhen the scripts in the page run independently from each other and depend on no other script on the page.
<script>, or any scripts within the document (including HTML and CSS)?
And if it does mean the later, just to be clear, are the below understandings correct?
async, and loads the .js file once they finish downloading.