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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://www.keycdn.com/support/prefer-async-resources
Oct 04, 2018 · The script is downloaded in the background and executed upon completion; As we can see by the differences mentioned between synchronous and asynchronous loading, async is more efficient as it does not interrupt web page parsing as the script is …
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function
The async function declaration defines an asynchronous function — a function that returns an AsyncFunction object. Asynchronous functions operate in a separate order than the rest of the code via the event loop, returning an implicit Promise as its result. But the syntax and structure of code using async functions looks like standard synchronous functions.52%
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
Compatibility notes. In older browsers that don't support the async attribute, parser-inserted scripts block the parser; script-inserted scripts execute asynchronously in IE and WebKit, but synchronously in Opera and pre-4 Firefox. In Firefox 4, the async DOM property defaults to true for script-created scripts, so the default behaviour matches the behaviour of IE and WebKit.
https://www.w3schools.com/tags/att_script_defer.asp
If neither async or defer is present: The script is fetched and executed immediately, before the browser continues parsing the page Browser Support The numbers in the table specify the first browser version that fully supports the attribute.
https://davidwalsh.name/html5-async
Sep 22, 2010 · WebKit recently implemented HTML5's async attribute for SCRIPT tags. We've been accomplishing this task with a variety of JavaScript hacks but this new attribute will allow us to prevent blocking in an easy way.
Nov 04, 2019 · "Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers. The site was built and is maintained by Alexis Deveria, with occasional updates provided by the web development community. The design used as of 2014 was largely created by Lennart Schoors. FAQ
https://javascript.info/async-await
There’s a special syntax to work with promises in a more comfortable fashion, called “async/await”. It’s surprisingly easy to understand and use. Async functions. Let’s start with the async keyword. It can be placed before a function, like this:
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