[wp-trac] [WordPress Trac] #64076: Emoji loader script can be moved to the footer since non-critical

[WordPress Trac]

#64076: Emoji loader script can be moved to the footer since non-critical
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 Reporter:  westonruter  |       Owner:  westonruter
     Type:  enhancement  |      Status:  closed
 Priority:  normal       |   Milestone:  6.9
Component:  Emoji        |     Version:  4.2
 Severity:  normal       |  Resolution:  fixed
 Keywords:  has-patch    |     Focuses:  performance
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Comment (by westonruter):

 Replying to [comment:8 jonsurrell]:
 > This makes me wonder why this emoji script is an inline script instead
 of fetching a remote script. Do you know why it has special treatment?

 That's a great question. I think it was probably originally inlined to
 avoid the blocking external JS request. Also, perhaps it is to reduce the
 chaining, since the emoji detection script loads another script which
 actually then does the loading/rendering of the emoji (via Twemoji). So
 inlining it eliminates a loader of a loader.

 Also, perhaps it was inlined because there was already a need to inline
 some JS to export the settings, and so adding the emoji-loader inline as
 would just be part of that.

 We should investigate further to confirm and then consider whether this
 would be an opportunity to register `wp-emoji-loader` as a script module
 with `fetchpriority=low` (#61734) and `in_footer=true` (#63486).

 It looks like the script was introduced in [31875] to fix #31701, to avoid
 loading an external script unless it was needed. Back then, there was no
 support for `defer` (or script modules), so every script was a blocking
 script, so this was an optimization to avoid external blocking scripts.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64076#comment:9>
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