Why writes that the GMAIL signature is too long?

Question

gmail

created a site, a signature generator for the company,
when we copy and paste the signature into an email, it says that it is too long a
limit of 10,000 characters, although the code itself has 3600 characters
, all links to pictures from google drive
and social networks are normal when you remove 40 characters from the signature, it passes the HTML
limit
layout + css3 + jquery connected json via ajax

Answer 1

I'm betting on the fact that in utf the Cyrillic alphabet takes up several times more space) That's the whole secret