Sadly the current one. Most web apps that have a backend database do all of the aforementioned. See e.g. https://amazon.com https://amazon.com Also, https://w

Sadly the current one. Most web apps that have a backend database do all of the aforementioned. See e.g. https://amazon.com https://amazon.com Also, https://www.ebay.com/b/Digital-Cameras/31388/bn_779 https://www.ebay.com/b/Digital-Cameras/31388/bn_779 -- try choosing a brand https://www.bestbuy.com/site/video-games/video-games-accessories/abcat0715000.c?id=abcat0715000 https://www.bestbuy.com/site/video-games/video-games-accesso... -- only loses scroll, probably a winner https://www.newegg.com/p/pl?N=50001157%20100007671%20601393085%20601351801%20601298157%20601304866%20600565702%20600095610%20600005864%20600005862%20600005860%20600005851%20600005846%20600005857 https://www.newegg.com/p/pl?N=50001157%20100007671%206013930... -- uses "Apply" button, out of competition, but still better https://www.levi.com/US/en_US/sale/mens-sale/c/levi_clothing_men_sale_us https://www.levi.com/US/en_US/sale/mens-sale/c/levi_clothing... -- a winner of the "wtf is going on after I click my size" category