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This repository was archived by the owner on Dec 4, 2017. It is now read-only.
As the message says, the element does not have a colspan property. It has the "colspan" attribute, but interpolation and property binding can set only properties, not attributes.
This is technically correct, but according to MDN table cells do have a colSpan property that maps to the colspan attribute, so this seems like a poor example of when an attr. attribute binding is required.