javascript - What's the difference between deferred scripts and scripts placed at the end of the page body? -


HTML 5 can be locked in HTMLMax, introduced the defer attribute for scripts

is not ready before you mess with someone may be using defer script that does not need to be loaded before the DOM (aka Dom).

For a long time, Web developers have been advised that all scripts do not need to be loaded before the dot, instead of in the page head and body at the end tag

defer what is the difference between use and long practice advice? What is the latter option?

I appreciate any answers. Thank you.

Both async and defer script start downloading immediately without parsing the parser and both

, so this behavior is not the same in all browsers. Therefore, performance will be better if the script is still at the end, because later it will be downloaded.

Edit 2017: Browser support is better now, so you can probably get away with async / Difr script in the head. It is still a safe option to possibly put them on the bottom; New browsers will still download them fast, even if they are not in the head.

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