[wp-trac] [WordPress Trac] #55126: Twenty Sixteen: Replace frontend jQuery usage with vanilla JS

[WordPress Trac]

#55126: Twenty Sixteen: Replace frontend jQuery usage with vanilla JS
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 Reporter:  sergiomdgomes  |      Owner:  sergiomdgomes
     Type:  enhancement    |     Status:  assigned
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Bundled Theme  |    Version:
 Severity:  normal         |   Keywords:  needs-patch
  Focuses:  javascript     |
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 `jQuery` is a large library, at around 90KB uncompressed, or 30KB gzipped.
 To make matters worse, it's usually enqueued in the head, and thus becomes
 part of the critical path, delaying first paint and subsequent metrics.

 Nowadays, the library is being enqueued for relatively little gain in many
 situations, given that the platform supports much of the functionality.
 Twenty Sixteen is an example of this, as it's relatively trivial to
 reimplement its functionality in native JS.

 This ticket focuses on removing jQuery as a frontend dependency for Twenty
 Twelve - specifically the frontend, as for example in the Customizer
 `jQuery` is loaded anyway (and performance is a bit less of a concern
 there).

 See also #54171 and #54172, which do the same for other themes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55126>
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