[wp-trac] [WordPress Trac] #47510: Developer tool - Best Practice - input comment field Does not use passive listeners

[WordPress Trac]

#47510: Developer tool - Best Practice - input comment field Does not use passive
listeners
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 Reporter:  efilippucci             |       Owner:  (none)
     Type:  defect (bug)            |      Status:  new
 Priority:  normal                  |   Milestone:  5.3.1
Component:  Comments                |     Version:  5.2.1
 Severity:  major                   |  Resolution:
 Keywords:  has-patch needs-        |     Focuses:  javascript, performance
  refresh                           |
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Changes (by andraganescu):

 * keywords:  has-patch => has-patch needs-refresh


Comment:

 Hi @eherman24 the patch looks good but I checked and since we still
 support IE11 there might be a need to check if passive is supported.

 [https://caniuse.com/#feat=passive-event-listener Can I use] tells us IE11
 doesn't support passive listeners and [https://developer.mozilla.org/en-
 US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
 MDN advises] we create some way to detect prior to setting the option.

 Could you please add this to the patch?

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Ticket URL: <https://core.trac.wordpress.org/ticket/47510#comment:12>
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