多语言SVG中的`systemLanguage`属性到底是什么意思？

Question

The SVG specs describe a systemLanguage attribute ( http://www.w3.org/TR/SVG/struct.html#SystemLanguageAttribute ) that can be used to provide multilingual content (for example when put in a switch that provides cases for different languages).

But what exactly is meant with systemLanguage ? Is it the language of the Browser? The language of operating System? The keyboard layout language? The thing that PHP's $_SERVER['HTTP_ACCEPT_LANGUAGE'] contains? A parameter of the SVG file itself (like foo.svg?en-US )? What "thing" can/should/may I change to actually trigger the element with matching systemLanguage attribute?

Background: I'm about to design a website that has a language switcher. This website will contain SVG images. And the SVG images will contain text. That's why I wonder about what the systemLanguage attribute evaluates exactly. Can I pass the language that is selected by the user of my website to the SVG file or does it only work if the user actually changes some Browser/OS language?

Edit: Just found, on Wikimedia Commons there is an example, where one can actually change the language with a drop down box: https://commons.wikimedia.org/wiki/File:SystemLanguage.svg , but I can't figure out how the language is passed to the SVG file.

Answer 1

In Firefox it matches your preferred language or languages set via about:preferences#content then click on the Choose... button

Chrome has a similar mechanism as do other UAs.

Mediawiki are are displaying a png on that page, they display a different png if you select a different language in the dropdown. If you click on the png you go to a page with an actual svg file that you can change by changing your UA language.