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Ilya Kantor 2017-04-23 12:38:54 +03:00
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2-ui/3-event-details/10-onload-ondomcontentloaded/article.md
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@ -67,9 +67,9 @@ There are two differences between them.
| | `async` | `defer` |
|---------|---------|---------|
| Order | Scripts with `async` execute *in the load-first order*. Their document order doesn't matter -- which loads first runs first. | Scripts with `defer` always execute *in the document order* (as they go in the document). |
| `DOMContentLoaded` | Scripts with `async` may load and execute *before `DOMContentLoaded`*: if they are small, and the document is big, they load faster. | Scripts with `defer` always execute *after `DOMContentLoaded`*: they wait for it if needed. |
| `DOMContentLoaded` | Scripts with `async` may load and execute while the document has not yet been fully downloaded. | Scripts with `defer` execute after the document is loaded and parsed (they wait if needed), right before `DOMContentLoaded`. |
So `async` is used for totally independent scripts, and `defer` is used where we want some order.
So `async` is used for totally independent scripts.
```