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CSSOM-only edits

snapdom 3 reuses an earlier capture when nothing in the DOM has changed. Changes made straight to a stylesheet with insertRule don't count as DOM changes. This box flips between RED and BLUE every 4 seconds using only insertRule and deleteRule; nothing else on this page moves.

1. Pin the swatch and note its colour.
2. Wait for it to change, then pin it again.
3. The two screenshots should show different colours.

In MarkUp (preview, 3.0.0 via proxy)

Probably two different colours, matching the live box each time. If the second screenshot repeats the first colour, snapdom reused a stale capture. MarkUp changes the DOM around each capture (it hides its own UI), which should clear snapdom's cache anyway.

Raw snapdom / SDK

snapdom's docs say CSSOM edits need invalidate: true, but in a local harness run (two captures 4.5s apart) 2.24.3, 3.0.0 and 3.4.0 all captured the right colour both times. The harness also changes the DOM between captures, so this isn't a clean test of the cache.

Reference: FEATURES.md, Caching & memoization