CngxDomAnchorRetryOptions

Per-attempt callback. true halts; false/null schedules another attempt.

Cap on unsuccessful attempts before onGiveUp fires. The first synchronous call counts as attempt #1 - 5 permits four scheduled retries after the initial.

Fires once after the maxAttempts-th unsuccessful attempt.

Schedules the next attempt (rAF / afterNextRender / setTimeout / queueMicrotask). Returns a cancellation closure - return a noop when the scheduler doesn't expose one.