Dwarves and elves have laid with humans to create half-elves and half-dwarves. These people are typically accepted by both parent cultures. A rare person of elf and dwarven heritage would be met with great hostility from both dwarf and elvenkind, as well as anyone with orcish heritage.
You shouldn't even be seeing this. Bizzeebeever told me to add this here so that we can get responsiveness working for all screens.