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Made these "floating" shelves for a friend's nursery.
(lemmy.world)
I know, they aren't floating yet.
To echo what the others here have said, long grain to long grain glue is very strong. Dowels/biscuits/dominoes are helpful for alignment, but for a table top it won't do much to increase strength.
Sorry, could be more clear. They will be true floating shelves, but have not yet been delivered to their new home.