Instructions: Open DevTools Network panel and Firefox Profiler to observe prefetch behavior.
This link should be prefetched when you hover your mouse over it. Watch the Network panel as you hover (don't click yet).
Subpage 1 (moderate/hover)This link should only be prefetched when you press the mouse button down on it (before releasing). Watch the Network panel as you click.
Subpage 2 (conservative/mousedown)This link has no speculation rule and should never be prefetched automatically.
Subpage 3 (no rule)