Edit in JSFiddle

<p lang="zh-Nshu">𛆁𛈬</p>
@font-face {
    font-family: 'Unicode Nushu';
    src:
        local('Unicode Nushu'),
        url(https://nushuscript.org/fonts/Uni1B170Nushu.woff2) format("woff2"),
        url(https://nushuscript.org/fonts/Uni1B170Nushu.woff) format("woff"),
        url(https://nushuscript.org/fonts/Uni1B170Nushu.ttf) format("truetype");
    unicode-range: U+16FE1, U+1B170-1B2FB;
}

:lang(zh-Nshu) {
    font-family: 'Unicode Nushu', sans-serif;
}

p {
    font-size: 400%;
}