Hi @Patrick,
I think a sprint should include a complete deliverable user increment.
Therefore, I suggest that Epic should break up to Story, while the specific engineering tasks of UX, UI, HTML, DEV should belong to the Story.
If any of the tasks in the Story are not completed, at the end of the Sprint, the entire Story will be moved back to the Backlog waiting for the redefined priorities to be sorted into the next Sprint.
Hope this helps.
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