CSS ID gone, Block Name purpose unclear
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It looks like the ability to specify a CSS ID in the block Design dialog has been removed in 5.7. There is something called "Block Name" but what I specify there doesn't show up in the page source, and I can specify the same Block Name for different blocks (which seems like it shouldn't be allowed?). I've looked over the documentation and the source but I'm not sure how Block Name should be used, except through database interaction. Any insight?
In the future we will be releasing a separate "Advanced" or "developer" menu option for block-level caching options, and we will move block name over to this area.