Do SVG docs support custom data- attributes?

Question

In HTML5, elements can have arbitrary metadata stored in XML attributes whose names start with data- such as

. Is th

Answer 1

The data-* attribute is part of HTML5. It’s not a generic XML attribute.

The current SVG W3C Recommendation is SVG 1.1 (from 2011-08). It doesn’t allow this attribute, as you can check in the attributes list.

The same is the case for the SVG 2 Working Draft (from 2012-08). Update (2015): It seems that it’s intended to support data-* attributes in SVG 2 (currently still a Working Draft).