[wp-trac] [WordPress Trac] #50933: Lazy loading in 5.5 causes flashing of custom logo in Firefox

[WordPress Trac]

#50933: Lazy loading in 5.5 causes flashing of custom logo in Firefox
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 Reporter:  demetris      |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.5.1
Component:  Media         |     Version:  5.5
 Severity:  normal        |  Resolution:
 Keywords:  2nd-opinion   |     Focuses:
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Comment (by demetris):

 Thanks for having a look, Kevin.

 Here is a screencast of what I am seeing:

 https://vimeo.com/449575076

 Using Firefox 80 (Beta channel) I click 17 times to navigate from page to
 page. The flashing happens 3 times. Usually, it happens more often.

 The layout shift along with the flashing is, I think, a by-product of the
 issue I am seeing. It does not happen if the logo dimensions are specified
 in the stylesheet.

 Here is the test website:

 https://0.kikizas.net/

 It is on WordPress 5.5 and has two active plugins: GitHub Updater and Two
 Factor.

 And here is a plugin I just made (can be installed with GitHub Updater) to
 quickly disable native lazy loading in WordPress 5.5:

 https://github.com/demetris/disable-native-lazy-loading

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Ticket URL: <https://core.trac.wordpress.org/ticket/50933#comment:5>
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