Async in HTML5

How to use the Async attribute in HTML5?

Async attribute is the Boolean attribute. Async means the script downloads asynchronously while the pages continue to parse.

<head>
    <script src="asyncMyJavaScript.js" async onload="GreetUser()"></script>
</head>

<body>
    <h1>Hello hello hello, this is async attribute of script element.</h1>
    
    async - The script downloads asynchrnously while the page continue to parse.

    <h2>Defer</h2>
    The script is executed when the page is finished parsing.

    <button onclick="SometOtherFunction()">Click me to test.</button>
</body>

When the page finishes loading, GreetUser() function is called.

Output

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Async in HTML5

How to use the Async attribute in HTML5?

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