Ido ISO code for HTML Lang

ISO 639-1 code for Ido is io.

<html lang="io">

You can use it in the lang attribute inside the <html> tag on your website to declare its language. This may be important for search engines and User Experience.

Example HTML Skeleton for Ido (io):

<!doctype html>
<html lang="io">
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>My website</title>