Update: The following description was initially written in 2011, but this bug was largely mitigated in H1 2024.
Author: uwestoehr
Description:
I uploaded an SVG image to Wikimedia Commons: http://commons.wikimedia.org/wiki/File:Human-Development-Index-Trends-2011.svg
The MediaWiki software (I guess version 1.18.0) creates a PNG preview of the SVG, but this preview is incorrect: the labels are all misplaced (in fact ignored).
The same happens for all preview sizes.
The original SVG however appears correct in Firefox 8: http://upload.wikimedia.org/wikipedia/commons/d/d7/Human-Development-Index-Trends-2011.svg
I created the SVG using the latest Inkscape and also Adobe Illustrator doesn't find a bug so it must be a bug in the MediaWiki preview generator.
Testcase
Upstream: https://gitlab.gnome.org/GNOME/librsvg/issues/183
See also definition:
https://www.w3.org/TR/SVG11/text.html#TSpanElementXAttribute
https://www.w3.org/TR/SVG11/text.html#TSpanElementDXAttribute