Grid rows automatically created when no template rows defined?

Hey, I have 3 items in a grid container and haven't defined any grid-template-rows however it's automatically created some (3) to hold the content.

1. Is this normal behavior?
2. Are these automatic rows something you can do things with such as make the elements share the same grid cell etc?

https://codepen.io/deerCabin/pen/MWMgmGL

Thanks in advance.
CodePenR
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grid query
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