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Could you clarify what you are referring to.
What is an ‘image holder’? – Do you mean a Gallery or Portfolio?
Do you have some HTML & CSS you could share in Codepen?
I don’t see how.
Are you suggesting that you would provide an image placeholder service that would provide images but they would have percentage widths based on…I don’t know what?.
Confused as to how this would work or even what the requirement would be.
I can already do this with the existing services and using CSS.