[wp-trac] [WordPress Trac] #31421: CSS files not loading in IE9 (Customize Component)

[WordPress Trac]

#31421: CSS files not loading in IE9 (Customize Component)
---------------------------+-----------------------------
 Reporter:  saintron       |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Customize      |    Version:  4.1
 Severity:  normal         |   Keywords:
  Focuses:  ui, multisite  |
---------------------------+-----------------------------
 We have a MU install of WordPress.  While testing 4.1, we noticed what we
 think is a bug that only occurs in IE9.  This issue has been replicated in
 4.1 MU, 4.1.1 MU.  It has also been replicated on a fresh, clean install
 of 4.1.1 on our localhost regardless of theme (2013, 2014 & 2015).  The
 issue is with the Customize component and occurs when navigating to any of
 the following:
 Appearance > Customize
 Appearance > Customize > Background (if available)
 Appearance > Customize > Header

 The left sidebar renders fine.  The right sidebar renders very small (see
 screen shot).  The iframe tag does not have the height and width property
 set.  We've done some testing and think the full CSS file isn't getting
 loaded.  We think this is due to the known limitation of 4095 selectors in
 IE9.  Upgrading to IE 10 is out of our control and we're hoping this issue
 can be replicated, documented and verified this issue doesn't occur in
 IE10.

 Thanks.

--
Ticket URL: <https://core.trac.wordpress.org/ticket/31421>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform