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Home / Miscellaneous / Tell the browser when to run your JavaScript code

Tell the browser when to run your JavaScript code

Tell the browser when to run your JavaScript code

In HTML5, you can tell the browser when to run your JavaScript code.

//Without async or defer, browser will run your script immediately, before rendering the elements that's below your script tag.
<script src="myscript.js"></script>

//With async (asynchronous), browser will continue to load the HTML page and render it while the browser load and execute the script at the same time.
//Async is more useful when you really don't care when the script loads and nothing else that is user dependent depends upon that script loading.(for scripts likes Google analytics)
<script async src="myscript.js"></script>

//With defer, browser will run your script when the page finished parsing. (not necessary finishing downloading all image files. 
<script defer src="myscript.js"></script>

Source

https://github.com/roeib/JavaScript-snippets#in-html5-you-can-tell-the-browser-when-to-run-your-javascript-code

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