I opened the STP 246 notes between meetings and ended up writing four little test stylesheets before I closed the tab, which is usually how a release earns its keep. The short version: this preview pushes on the CSS color and image surfaces, gives attr() a longer reach, and quietly turns on two typography knobs in preview. Per the source, this is Safari Technology Preview 246 — a preview build, not a stable Safari release, so treat everything here as engine-specific behaviour you can experiment with today rather than something to ship broadly tomorrow.
What landed in color and images
Two of the additions slot directly into the <image> value type. The first lets you put images on both sides of a theme switch:
background: light-dark(<image>, <image>);
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