Split timeline events into named horizontal lanes while keeping a shared bottom axis.
Define explicit lanes with options.lane.data, place events with ArticleData.lane, and update each lane at runtime through the Lane API.
Use the lane DOM hooks, including histropedia-lane-index-N and histropedia-lane-position-*, for stylesheet-only lane backgrounds and stacking effects. For a smaller starting point, open the simple timeline lanes CodePen.
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