95   readonly top: number;  property
131   readonly top: number;  property in Rect2D
149       top: Math.min(a.y, b.y),
167       top: y,
174   constructor({left, top, right, bottom}: Bounds2D) {
176     this.top = this.y = top;
180     this.height = bottom - top;
192       top: Math.max(this.top, bounds.top),
211         top: this.top - amount,
219         top: this.top - height,
237       top: this.top - point.y,
250       bounds.top < this.top ||
265       point.y >= this.top &&
282       this.top < bounds.bottom &&
283       this.bottom > bounds.top
295       top: this.top + point.y,
304       bounds.top === this.top &&