[wp-trac] [WordPress Trac] #50328: Enqueue script and style assets only for blocks present on the page

[WordPress Trac]

#50328: Enqueue script and style assets only for blocks present on the page
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 Reporter:  aduth        |       Owner:  gziolo
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  5.5
Component:  Editor       |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  javascript
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Comment (by westonruter):

 Replying to [comment:7 gziolo]:
 > it all edge cases makes me wonder whether the initial approach proposed
 by aduth wouldn't be more reliable in the majority of cases.

 Are you referring to enqueueing the scripts/styles when the blocks are
 rendered and then printing the scripts/styles in the footer? The risk
 there is with [https://en.wikipedia.org/wiki/Flash_of_unstyled_content
 FOUC]. But FOUC is probably better than adding a lot of assets which are
 never used on the page. Nevertheless, FOUC can negatively impact
 [https://web.dev/vitals/ Core Web Vitals], in particular
 [https://web.dev/lcp/ largest contentful paint] (LCP) and
 [https://web.dev/cls/ cumulative layout shift] (CLS).

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Ticket URL: <https://core.trac.wordpress.org/ticket/50328#comment:8>
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