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Nest the boxes
Build a simple page: the html element holds a head and a body. The head holds the title. The body holds a heading and a paragraph. Drag each tile under its parent.
Tiles
Drag a card, or tap it and then tap where it goes.
The page
Start with the outermost box.
Drop it here.
Drop it here.
The HTML your tree makes
<!-- empty page -->Next unlocks when this is right.