What's a 3D doing in this HTML?

Question

I'm trying to duplicate a mailer I got into my gmail by taking a look at its code. I see a lot of this in multiple source viewers:

=A0

Is 3D some sort of mail rendering thing I don't know about?

user_15581701 · Answer

Folks from Google using Laravel, you can stop the Mail facade from adding all this weird 3D stuff by setting your encoder to raw:

$message->setEncoder(new Swift_Mime_ContentEncoder_RawContentEncoder);