# Bone Flow #121 Timeline

Status: Development / Candidate
Runtime: BoneTimeline 1.0.0
HTML Functional Class: `bf-timeline`
DOC: DOC-0121

Formal responsibilities: Delay, Duration, Loop, Repeat, Sequence, Parallel.

Formal shared guide sources:
- `docs/doc/content/DOC-0121/ja.md`
- `docs/doc/content/DOC-0121/en.md`

Start-source relationship:
- #021 Shape / TIME JOB / SCHEDULE_TRIGGER may start #121 from schedule conditions.
- #120 Trigger may start #121 from event conditions.
- #121 manages time after the start request; it does not own the absolute start condition.
- Start-source connection images added to #121 are normal-path only.

Responsibility boundaries:
- #120 Trigger owns event start conditions.
- #122 KeyFrame owns intermediate values/states.
- #117 Animation owns a single Animation's behavior.
- #054 Display Timeline owns display UI; #121 does not implement a graphical display timeline.

User localhost confirmation is required before Completed / Specification Frozen.