The proper langtags are sr-Cyrl and sr-Latn. For Serbian, MediaWiki has been using sr-EC and sr-EL, but under BCP 47 those tags mean Serbian as spoken in the region EC (Ecuador) and Serbian as spoken in EL (unassigned region). There is some confusion about proper language tags.

The systemLanguage attribute should be a list of IETF langtags. As of October 2018, both Chrome and Firefox fixed their systemLanguage matching Edge still only recognizes the first langtag and ignores the remaining ones. With that convention, both Chrome and Edge will parse the first langtag correctly (Chrome will incorrectly parse the second langtag Edge only recognizes the first langtag and ignores all others). The first langtag should be the public langtag followed by a space. IETF langtagĪs a further complication, as of May 2018, Google Chrome and Microsoft Edge browsers fail to handle systemLanguage attributes correctly, too. To work around that problem, a private-use langtag (one in the range qaa- qtz) can be used to specify the language. For example, RSVG will not distinguish zh-Hans (Chinese using simplified script) and zh-Hant (Chinese using traditional script). RSVG only matches the first subtag (the group of characters before the first hyphen) in the langtag, so RSVG ignores the any country code or script subtags that follow. RSVG does not correctly compare systemLanguage attributes, which SVG specifies is a comma-separated list of IETF language tags (langtag). Private-use langtag qct to select zh-Hant. 3.10.6 Layout with text and tspan elements.3.10.5 Font substitution and fallback fonts.

3.10.3 Bad letter-alignment on small font-size.3.10.1 Not displayed text (Flowed Text bug).3.9 Plain SVG, compressed SVG, generic specifications.3.1 Before you upload: validation and checking image appearance.3 Creating SVG images for Wikimedia Commons.2.1.2 not displayed text / Flow elements.

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