JP Journal · deterministic simulator + browser-observed probe

ResizeObserver feedback lab

Classify a bounded state graph as stable, cyclic, or cap-exhausted. The separate fixed DOM probe records browser behavior without placing browser timing inside the deterministic hash.

Deterministic simulator

ModeInitial stateRegular sizeCompact sizeEnter thresholdLeave thresholdEpsilonMutation deltaDelivery cap

Status: not run

Real DOM probe (browser-observed, non-deterministic)

This fixed same-document component uses no user selectors, HTML, CSS, or code. Start always tears down an earlier observer, animation frame, and error listener first.

Observed component
regular · expected border box 318

Truth boundary

The simulator explains declared state transitions, not a browser layout engine. requestAnimationFrame, containment, child-only writes, and hysteresis are interventions with trade-offs, not universal cures. Loop-error suppression is never classified as convergence.