[wp-trac] [WordPress Trac] #38847: Twenty Seventeen: Header Image used is smaller than 2000x1200px

[WordPress Trac]

#38847: Twenty Seventeen: Header Image used is smaller than 2000x1200px
---------------------------+------------------------
 Reporter:  transl8or      |       Owner:  joemcgill
     Type:  defect (bug)   |      Status:  accepted
 Priority:  normal         |   Milestone:  4.7
Component:  Bundled Theme  |     Version:  trunk
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |     Focuses:  ui
---------------------------+------------------------
Changes (by joemcgill):

 * keywords:   => has-patch
 * owner:   => joemcgill
 * status:  new => accepted
 * milestone:  Awaiting Review => 4.7


Comment:

 Hi @transl8or – thanks for the report!

 This looks to be an issue of the `sizes` attribute being calculated
 incorrectly, resulting in the browser downloading the wrong resource.
 [attachment:38847.diff] adds a filter to the markup generated by
 `get_header_image_tag()` to correct this problem.

 Before the filter, the `img` contained:
 `sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width:
 1071px) 543px, 580px"`

 And after:
 `sizes="100vw"`

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Ticket URL: <https://core.trac.wordpress.org/ticket/38847#comment:1>
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