[wp-trac] [WordPress Trac] #31276: Load json2.js only in browsers that need it

[WordPress Trac]

#31276: Load json2.js only in browsers that need it
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 Reporter:  azaozz         |      Owner:
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  4.2
Component:  Script Loader  |    Version:
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 Now that we have IE conditional comments for JS, we should be loading
 json2.js only in browsers that still need it, `lt IE 8`. That would load
 about 18kb less JS.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31276>
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