Javascript: async vs async="async" [duplicate]

Question

async is a good way to eliminate render-blocking resources, so I am trying to implement that in one of my projects. However, I see people declaring that in different ways:

<script src="demo_async.js" async></script>

and

<script src="demo_async.js" async="async"></script>

Does it matter which way it is being declared? Especially in terms of browser compatibility...

The accepted answer to that question states "setting async=true, async=false or async=anything all mean the same thing.", which is exactly what the accepted answer to this question states. Don't see how that doesn't answer your question. — Heretic Monkey
– Heretic Monkey, Commented Feb 13, 2020 at 18:18

zero298 · Accepted Answer · 2020-02-13 18:03:32Z

5

No, it's a boolean attribute so it doesn't matter if you give it a value or not.

From MDN:

This is a boolean attribute: the presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.

answered Feb 13, 2020 at 18:03

zero298

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