The page demonstrates how to use the WOFF2 version of Nuosu SIL for web pages, using local copies of the .woff2 files in this archive. For more information on this technique - and how to use the normal TrueType version as a web font - see Using SIL Fonts on Web Pages.
The body of this document is styled using an external stylesheet, with Nuosu SIL set as the default font, and loaded directly as a WOFF2 file using the @font-face rule. If you're seeing a serif font here then it is working. Otherwise the text will be in a sans-serif or your browser default. This technique is supported in all modern browsers.
To see specifically how these techniques are specified in the CSS and HTML view the source to this page and the accompanying CSS file.
ꌒꆏꉘꃅꌒ,
ꉘꃅꌒꂸꐯ,
ꉘꃅꎵꑳꀕ,
ꉘꃅꑌꐥꌒ;
ꌒꆏꅔꐎꌒ,
ꅔꐎꌒꂸꐯ,
ꅔꐎꁤꇅꀕ,
ꅔꐎꏰꐥꌒ。
(Excerpt from the traditional song 《ꀉꂿꅩꌺ》)