Here is the tutorial:
I confirmed with the author that it was the TextureProperty node, and then you select TexelSize from dropdown.
What confused me was that you need to convert from a vector4 to 3, which at the time I didn’t know how to do, so was getting errors that I didn’t know how to solve. But all that is necessary is to mask RGB (component mask node).
Also one thing hemming me up is that if you make a lerp node and plug in a vector4, it assumes that type for the node. So if you plug in something, change your mind in plug in something else, the type for the lerp node will still remain and give you errors. (for those familiar with blueprint, same thing sometimes happens with array related nodes, for instance, except there you usually have some colors which make it easy to see) Just confusing stuff for beginner with material graph.