Doubt in Add a box-shadow to a Card-like Element

Hello community,
if The box-shadow property takes values for

  • offset-x (how far to push the shadow horizontally from the element),
  • offset-y (how far to push the shadow vertically from the element),
  • blur-radius ,
  • spread-radius and
  • color , in that order.

then my question is, for which property is zero in the first place assigned in the below example?

box-shadow: 0 10px 20px rgba(0,0,0,0.19);

offset-x has a value of 0
and there is not a spread-radius

look here for more infos:

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