[wp-trac] [WordPress Trac] #36822: srcset is added to <img /> even if media file is not present in media library

[WordPress Trac]

#36822: srcset is added to <img /> even if media file is not present in media
library
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 Reporter:  temmokan          |       Owner:  joemcgill
     Type:  defect (bug)      |      Status:  reviewing
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Media             |     Version:  4.5.2
 Severity:  normal            |  Resolution:
 Keywords:  responsive media  |     Focuses:
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Comment (by joemcgill):

 HI @temmokan,

 Thanks for the report. The `srcset` and `sizes` attributes are added on
 the front end if the image contains a `wp-image-{{id}}` class, based on
 the attachment metadata. It's not immediately clear to me based on your
 example what might be happening here. Could you outline the steps you've
 going through to reproduce this issue? In other words, how are those
 images being added to the posts if they're not in the media library, and
 how are you changing the `src` attribute to point to an external source?

 Thanks.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36822#comment:3>
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