[wp-trac] [WordPress Trac] #54192: `get_header_image_tag` doesn't add `srcset`/`sizes`

[WordPress Trac]

#54192: `get_header_image_tag` doesn't add `srcset`/`sizes`
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 Reporter:  strarsis      |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by strarsis):

 Replying to [comment:1 joyously]:
 > The `srcset` and `sizes` are added later, for all the images that have a
 `wp-image-*` class. The image id is needed to do the lookup for the data
 to use.

 How are these attributes added later? Does WordPress parse the HTML and
 add these directly?
 The function uses a filter, but it doesn't seem to be used elsewhere as
 the secret and sizes attributes are missing.
 https://github.com/WordPress/WordPress/blob/07139653b9f1b8b1cc88195b971e96597fbc8b10
 /wp-includes/theme.php#L1200

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Ticket URL: <https://core.trac.wordpress.org/ticket/54192#comment:2>
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