[wp-trac] [WordPress Trac] #55146: WP5.9 Customizer partially white-screens in Safari browser

[WordPress Trac]

#55146: WP5.9 Customizer partially white-screens in Safari browser
----------------------------+-----------------------------
 Reporter:  schmedia@…      |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  General         |    Version:  5.9
 Severity:  normal          |   Keywords:
  Focuses:  administration  |
----------------------------+-----------------------------
 Running (Mac) Safari 13.1.2, WordPress 5.9, on multiple sites.

 When loading the Customizer, I get a partial white screen – no left-column
 menu items (although the frame is there) and no page preview. Screenshot
 attached, and console error messages as follow:

 [Error] Failed to load resource: the server responded with a status of 404
 (Not Found) (gutenberg.css, line 0)
 [Error] TypeError: o.addEventListener is not a function. (In
 'o.addEventListener("change",function(e){r=e.matches})',
 'o.addEventListener' is undefined)
         (anonymous function) (load-scripts.php:6:132)
         Global Code (load-scripts.php:6:111258)
 [Error] TypeError: undefined is not an object (evaluating
 'c.Panel.extend')
         (anonymous function) (customize-nav-menus.min.js:2:10976)
         Global Code (customize-nav-menus.min.js:2:45601)
 [Error] TypeError: undefined is not an object (evaluating
 'wp.customize.Control.extend')
         Global Code (slider-customizer.js:1:92)
 [Error] TypeError: undefined is not an object (evaluating
 'wp.customize.Control.extend')
         Global Code (slider-control.js:1:86)
 [Error] TypeError: undefined is not an object (evaluating
 'api.Control.extend')
         (anonymous function) (spacing-customizer.js:4)
         Global Code (spacing-customizer.js:160)
 [Error] TypeError: undefined is not an object (evaluating
 'api.Control.extend')
         (anonymous function) (backgrounds-customizer.js:2)
         Global Code (backgrounds-customizer.js:31)
 [Error] TypeError: undefined is not an object (evaluating
 'api.Control.extend')
         (anonymous function) (copyright-customizer.js:2)
         Global Code (copyright-customizer.js:12)
 [Error] TypeError: undefined is not an object (evaluating
 'api.Section.extend')
         (anonymous function) (upsell-control.js:2)
         Global Code (upsell-control.js:12)
 [Error] TypeError: undefined is not an object (evaluating
 'wp.customize.Control.extend')
         s (customizer.js:1:121358)
         (anonymous function) (customizer.js:1:131873)
         o (customizer.js:1:863)
         t (customizer.js:1:729)
         (anonymous function) (customizer.js:1:1826)
         Global Code (customizer.js:1:1829)
 [Error] Error: Minified React error #200; visit https://reactjs.org/docs
 /error-decoder.html?invariant=200 for the full message or use the non-
 minified dev environment for full errors and additional helpful warnings.
         (anonymous function) (react-dom.min.js:243:307)
 [Error] TypeError: The superclass is not an object.
         Oe (customize-widgets.min.js:2:28659)
         ke (customize-widgets.min.js:2:32932)
         (anonymous function) (customize.php:3105)
 [Error] TypeError: undefined is not a function (near
 '...wp.customize.section...')
         (anonymous function) (load-scripts.php:2:31711)
 > Selected Element
 < <div id="customize-preview" class="wp-full-overlay-main">…</div>

 :Benjamin

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Ticket URL: <https://core.trac.wordpress.org/ticket/55146>
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