Really tiny spider on prickly pear cactus spines

Here are two shots of a really tiny spider laying down a chaotic web on a prickly pear cactus in the garden. It was going up and down the sides of the cactus connecting the spines with webbing, maybe like the web in this photo from a few years ago. I got these shots in light rain without flash, and I was happy to get them as good as they are! I'm not sure what kind of spider it is, but it might be the smallest spider I've ever managed to photograph - just 230 pixels across in these 1:1 macro shots, which comes to 0.9 mm, about 1/32 inch. (See here for how I figured.) It's a wonder that I ever saw it, but it was moving. (San Marcos Pass, 9 January 2020)

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Uploaded on January 16, 2020
Taken on January 9, 2020