show a placeholder for the images until they get loaded

[aguaviva]

Please describe the feature you want to be implemented.
If a size is specified in the img tag, show a placeholder of that size until the picture is loaded

Explain why the feature is useful
This eliminates the images poping up and also the number of layout recalculations on large galleries, this will result on pages loading faster and a predictable layout.

Have you seen it somewhere else?
in Facebook

[gingerchew]

Hey there @aguaviva,

You could probably achieve this with CSS using this article as an example: https://css-tricks.com/building-skeleton-screens-css-custom-properties/ I don't think you'd need to change any of the HTML, but that is also an option available to you (but it is one of the more advanced ones.)

If GLightbox had a plugin system, I feel like it would be a great candidate. I'd love to hear what others have to say about it though!