I was thinking of making a 'load on scroll' image gallery plugin, i.e. I do not want the image to load until it is in view in the viewport. That got me thinking in terms of implementation.
I don't want to use markup that would mean that the images were not indexed by Google, but the question is, what can you do?
You can't have img tags but then stop the files from being loaded because that defeats the purpose completely.
You could not care about the markup and use
image site maps instead, but that makes life harder for the person using the plugin.
What, if anything, can one do?