[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:  azaozz
     Type:  enhancement    |      Status:  reopened
 Priority:  normal         |   Milestone:  Future Release
Component:  Script Loader  |     Version:  4.6
 Severity:  normal         |  Resolution:
 Keywords:                 |     Focuses:
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Comment (by markcallen):

 I just wanted to add a comment about filters on output. It is perhaps the
 subject of a new discussion or ticket.

 If any output is a html tag, then I believe it should be an array of
 attribute => value pairs that is filtered.

 This gives full control to developers to add, view, edit or remove
 attributes based on their specific needs. It is more resilient to
 successive filters being used and more importantly it works for any
 attributes - current or future.

 String manipulation which is relied on too much for a lot of filters is
 just ugly and messy and often gets  implemented assuming that no previous
 filter has been called.

 In the case of this ticket, this approach would allow developers to add
 async/defer attributes based on their specific implementations. It
 wouldn't need other updates to core and is future proof to any other cool
 attributes that are created in the future.

 Whether developers use that to enhance or degrade performance is a matter
 for the developer, in my opinion. I agree with @azaozz, better to refactor
 script-loader for 2018 - with my above point above included on eventual
 output :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/12009#comment:53>
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