It even seems to modify pages that aren't HTML to begin with. On Android, when I open the plain-text pubkey file linked to in my signature, it adds <head> and <body> tags.
-- Michael GPG PubKey: https://www.vigovproductions.net/pubkey.asc (Fingerprint: FAFA F12C 4440 460A 89D0 A67F 8D31 13F7 D36F 833C)
signature.asc
Description: OpenPGP digital signature
