Way to cache tabs on Android

How do I pin a tab on Android so that it doesn’t reload the next time I navigate to it? I frequently want to load a page while I have wifi, and KEEP IT IN MEMORY specifically so that it will still be handy later when data is spotty - e.g. bringing up event tickets before checking in at a crowded event where the bandwidth is saturated. This shouldn’t be that hard, but I can’t figure out how to do it.