Though it takes advantage of BIP32 system you'll be able to nonetheless import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There's BIP44 version which some wallet use with the technology of seeds. You are able to see the complete source code in standalone, offline html file. https://bookmarkspiral.com/story18567482/generate-bip39-passphrase-examine-this-report-on-bip39-phrase