[wp-trac] [WordPress Trac] #54172: Replace frontend jQuery usage with vanilla JS in Twenty Fifteen

[WordPress Trac]

#54172: Replace frontend jQuery usage with vanilla JS in Twenty Fifteen
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 Reporter:  flixos90       |      Owner:  flixos90
     Type:  enhancement    |     Status:  assigned
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Bundled Theme  |    Version:
 Severity:  normal         |   Keywords:  needs-patch
  Focuses:  javascript     |
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 Using jQuery for a few simple JS interactions in WordPress themes is a
 common performance problem, which is in most cases relatively
 straightforward to address: Vanilla JavaScript has for the better part of
 a decade included enough APIs that work across all popular browsers so
 that the remaining benefits of jQuery are around a few utility functions,
 that could be re-implemented in a few lines of code. Using jQuery for such
 simple use-cases results in around 80% more JS code being loaded in the
 frontend.

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

 Also see #54171, which does the same for Twenty Twelve.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54172>
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