Shows x approaching a from the left and right while f(x) approaches a single value L, even when the function’s value at x=a is different (a hole at (a,L) and a filled point at (a,f(a))). The animation slows near a to emphasize “arbitrarily close” without reaching the point, and highlights that the two-sided limit exists when left- and right-hand limits match.
Renders a piecewise visualization with an open circle at (a,L) and a filled square at (a,f(a)); two animated markers approach a from both sides using cubic easing. Uses grid-snapped coordinates for a blocky aesthetic, green-on-black palette, and responsive scaling via baseSize.