defer attribute for external scripts
defer attribute for external scripts
The boolean defer attribute on script elements allows the external JavaScript file to run when the DOM is loaded, without delaying page load first.
Spec | https://html.spec.whatwg.org/multipage/scripting.html#attr-script-defer |
---|---|
Status | WHATWG Living Standard |
IE | Edge | Firefox | Chrome | Safari | Opera |
---|---|---|---|---|---|
57 | 62 | ||||
56 | 61 | TP | 48 | ||
16 | 55 | 60 | 11 | 47 | |
11 | 15 | 54 | 59 | 10.1 | 46 |
10 | 14 | 53 | 58 | 10 | 45 |
9 (1) | 13 | 52 | 57 | 9.1 | 44 |
8 (1) | 12 | 51 | 56 | 9 | 43 |
Show all | |||||
7 (1) | 50 | 55 | 8 | 42 | |
6 (1) | 49 | 54 | 7.1 | 41 | |
5.5 (1) | 48 | 53 | 7 | 40 | |
47 | 52 | 6.1 | 39 | ||
46 | 51 | 6 | 38 | ||
45 | 50 | 5.1 | 37 | ||
44 | 49 | 5 | 36 | ||
43 | 48 | 4 | 35 | ||
42 | 47 | 3.2 | 34 | ||
41 | 46 | 3.1 | 33 | ||
40 | 45 | 32 | |||
39 | 44 | 31 | |||
38 | 43 | 30 | |||
37 | 42 | 29 | |||
36 | 41 | 28 | |||
35 | 40 | 27 | |||
34 | 39 | 26 | |||
33 | 38 | 25 | |||
32 | 37 | 24 | |||
31 | 36 | 23 | |||
30 (2) | 35 | 22 | |||
29 (2) | 34 | 21 | |||
28 (2) | 33 | 20 | |||
27 (2) | 32 | 19 | |||
26 (2) | 31 | 18 | |||
25 (2) | 30 | 17 | |||
24 (2) | 29 | 16 | |||
23 (2) | 28 | 15 | |||
22 (2) | 27 | 12.1 | |||
21 (2) | 26 | 12 | |||
20 (2) | 25 | 11.6 | |||
19 (2) | 24 | 11.5 | |||
18 (2) | 23 | 11.1 | |||
17 (2) | 22 | 11 | |||
16 (2) | 21 | 10.6 | |||
15 (2) | 20 | 10.5 | |||
14 (2) | 19 | 10.0-10.1 | |||
13 (2) | 18 | 9.5-9.6 | |||
12 (2) | 17 | 9 | |||
11 (2) | 16 | ||||
10 (2) | 15 | ||||
9 (2) | 14 | ||||
8 (2) | 13 | ||||
7 (2) | 12 | ||||
6 (2) | 11 | ||||
5 (2) | 10 | ||||
4 (2) | 9 | ||||
3.6 (2) | 8 | ||||
3.5 (2) | 7 | ||||
3 | 6 | ||||
2 | 5 | ||||
4 |
iOS Safari | Opera Mini | Android Browser | Blackberry Browser | Opera Mobile | Android Chrome | Android Firefox | IE Mobile | Android UC Browser | Samsung Internet | QQ Browser | Baidu Browser |
---|---|---|---|---|---|---|---|---|---|---|---|
11 | |||||||||||
10.3 | all | 56 | 10 | 37 | 59 | 54 | 11 | 11.4 | 5 | 1.2 | 7.12 |
10.0-10.2 | 4.4.3-4.4.4 | 7 | 12.1 | 10 | 4 | ||||||
9.3 | 4.4 | 12 | |||||||||
9.0-9.2 | 4.2-4.3 | 11.5 | |||||||||
Show all | |||||||||||
8.1-8.4 | 4.1 | 11.1 | |||||||||
8 | 4 | 11 | |||||||||
7.0-7.1 | 3 | 10 | |||||||||
6.0-6.1 | 2.3 | ||||||||||
5.0-5.1 | 2.2 | ||||||||||
4.2-4.3 | 2.1 | ||||||||||
4.0-4.1 | |||||||||||
3.2 |
Notes
Partial support in older IE refers to a buggy implementation (see issue).
Deferred scripts may run after DOMContentLoaded - https://bugzilla.mozilla.org/show_bug.cgi?id=688580
Bugs
IE < 10 may interleave execution of scripts, See the discussion.
Resources
Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=script-defer