commit cba438 on Github
As you can see line #1 in index.html is marked as changed:
But as I can see there's no single changed character. Is it up to GitHub or Git? Is it a bug or some hidden character was changed?
Yes, there is a hidden character there, a UTF8 BOM.
$ git show cba438:index.html | od -c | head -1 0000000 357 273 277 < ! d o c t y p e h t m $ git show cba438~1:index.html | od -c | head -1 0000000 < ! d o c t y p e h t m l > \n