Questions about the character Latin capital letters sharp S "ß" (u+1e9e) display

Today when testing the product, encountered the German character ß on the Web page as "SS", looked up some relevant information found that the character is generally replaced with "SS" or "SS".

It is important to note that this character differs from its lowercase characters Latin Small Letter sharp S "ß" Unicode is U+00DF

RELATED links:

Http://graphemica.com/%E1%BA%9E

Https://en.wikipedia.org/wiki/Capital_%E1%BA%9E

Questions about the character Latin capital letters sharp S "ß" (u+1e9e) display