On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 61 on 2017-09-05 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Chrome Android version 61 on 2017-09-05 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Edge version 79 on 2020-01-15 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Firefox version 60 on 2018-05-09
In Firefox for Android version 60 on 2018-05-09
Not in Internet Explorer
In Quest Browser version 5.0 on undefined Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Opera version 48 on 2017-09-27 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Opera Android version 45 on 2018-02-15 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In Safari version 10.1 on 2017-03-27 Note: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).
In Safari on iOS version 10.3 on 2017-03-27 Note: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).
In Samsung Internet version 8.0 on 2018-07-18 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In WebView Android version 61 on 2017-09-05 Note: Module scripts without the async attribute do not load when the page is served as XHTML (application/xhtml+xml). See bug 40518469.
In WebView on iOS version 10.3 on 2017-03-27 Note: Module scripts do not load when the page is served as XHTML (application/xhtml+xml).