[wp-trac] [WordPress Trac] #12009: Add support for HTML 5 "async" and "defer" attributes

[WordPress Trac]

#12009: Add support for HTML 5 "async" and "defer" attributes
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 Reporter:  Otto42                           |       Owner:  10upsimon
     Type:  enhancement                      |      Status:  assigned
 Priority:  high                             |   Milestone:  6.3
Component:  Script Loader                    |     Version:  4.6
 Severity:  normal                           |  Resolution:
 Keywords:  has-patch has-unit-tests commit  |     Focuses:  performance
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Comment (by spacedmonkey):

 Replying to [comment:128 azaozz]:

 > Generally speaking the "script after" functionality promotes writing of
 mediocre JS (scripts that require additional JS code snippets to be
 outputted from PHP in order to work). This was somewhat useful ~10 years
 ago as many WP devs had good knowledge of PHP but weren't particularly
 well versed in JS. However in 2023 I'd like to think that most WP devs
 have a deep understanding of JS, and can implement anything they may need
 or want with "pure" JS, with no need of PHP "crutches" :)

 There are many examples of where after is used in core script with great
 success. A couple of scripts that are important include.

 wp-i18n
 heartbeat
 wp-api-fetch
 wp-blocks
 wp-date

 After can be missed used. But in many cases it is correctly used by
 developer to pass data from PHP to javascript. Take for example moment,
 that uses it to setup translated dates.

 {{{#!php
 <script id='moment-js-after'>
 moment.updateLocale( 'en_US',
 {"months":["January","February","March","April","May","June","July","August","September","October","November","December"],"monthsShort":["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],"weekdays":["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],"weekdaysShort":["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],"week":{"dow":1},"longDateFormat":{"LT":"g:i
 a","LTS":null,"L":null,"LL":"F j, Y","LLL":"F j, Y g:i a","LLLL":null}} );
 </script>
 }}}

 Supporting after makes sense to me, as it is widely and correctly used by
 developers.

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Ticket URL: <https://core.trac.wordpress.org/ticket/12009#comment:130>
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