async attribute for external scripts
async attribute for external scripts
The boolean async attribute on script elements allows the external JavaScript file to run when it's available, without delaying page load first.
Spec | https://html.spec.whatwg.org/multipage/scripting.html#attr-script-async |
---|---|
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 | 13 | 52 | 57 | 9.1 | 44 |
8 | 12 | 51 | 56 | 9 | 43 |
Show all | |||||
7 | 50 | 55 | 8 | 42 | |
6 | 49 | 54 | 7.1 | 41 | |
5.5 | 48 | 53 | 7 | 40 | |
47 | 52 | 6.1 | 39 | ||
46 | 51 | 6 | 38 | ||
45 | 50 | 5.1 | 37 | ||
44 | 49 | 5 (1) | 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 | 35 | 22 | |||
29 | 34 | 21 | |||
28 | 33 | 20 | |||
27 | 32 | 19 | |||
26 | 31 | 18 | |||
25 | 30 | 17 | |||
24 | 29 | 16 | |||
23 | 28 | 15 | |||
22 | 27 | 12.1 | |||
21 | 26 | 12 | |||
20 | 25 | 11.6 | |||
19 | 24 | 11.5 | |||
18 | 23 | 11.1 | |||
17 | 22 | 11 | |||
16 | 21 | 10.6 | |||
15 | 20 | 10.5 | |||
14 | 19 | 10.0-10.1 | |||
13 | 18 | 9.5-9.6 | |||
12 | 17 | 9 | |||
11 | 16 | ||||
10 | 15 | ||||
9 | 14 | ||||
8 | 13 | ||||
7 | 12 | ||||
6 | 11 | ||||
5 | 10 | ||||
4 | 9 | ||||
3.6 | 8 | ||||
3.5 | 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
Using script.async = false; to maintain execution order for dynamically-added scripts isn't supported in Safari 5.0
Resources
Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=script-async