What is $H^1([0,1]) \otimes H^1([0,1])$?

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Let $H^1([0,1])$ denote the Sobolev space $H^1$ on the interval $[0,1]$. What is $H^1([0,1]) \otimes H^1([0,1])$?

Here, $\otimes$ the tensor product of Hilbert spaces. In particular, how is that object related to $H^1([0,1]^2)$?