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

While other answers are technically correct, they omit the fact that SVG provides an alternative mechanism for data-*. SVG allows any attribute and tag to be included, as long as it doesn't conflict with existing ones (in other words: you should use namespaces).

To use this (equivalent) mechanism:

• use mydata:id instead of data-myid, like this:

• make sure you define the namespace in SVG opening tag, like this:

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EDIT: SVG2, currently W3C Candidate Recommendation (04 October 2018), will support data- directly (without namespaces, the same as HTML). It will take some time before the support is widespread though. Thanks @cvrebert for pointing this out.