The line stroke-draws left→right, the area fills behind it, each point pops as the line reaches it, and the headline figure counts up in step.
The chart is decorative (aria-hidden); the crawlable numbers live in the <table class="fig-table"> beside it. Line-draw + marker are the Codrops ScrollGraph paradigm; the per-point pop + the KPI count are the INFI "by the numbers" generalization.