utf-8 bomとは - SERP Analysis

https://qiita.com/mitsutoyo32104/items/76335bb6e783d55f311c

https://uxmilk.jp/48923

https://funfairfanfare.com/%E3%83%86%E3%82%AD%E3%82%B9%E3%83%88%E3%82%A8%E3%83%87%E3%82%A3%E3%82%BF-utf-8-bom%E7%84%A1%E3%81%97-bom%E4%BB%98%E3%81%8D/

https://ja.wikipedia.org/wiki/%E3%83%90%E3%82%A4%E3%83%88%E9%A0%86%E3%83%9E%E3%83%BC%E3%82%AF

https://blog.framinal.life/entry/2020/03/28/052906

https://rishuntrading.co.jp/blog/programing/utf-8-bom-change/

https://idealump.com/service/lab/434

https://en.wikipedia.org/wiki/Byte_order_mark

https://ascii.jp/elem/000/004/058/4058837/

http://ths.ashigeki.net/2008/01/utf-8bom.php