Summary: HTML elements have a .dataset property that allows convenient
somewhat structured access to data-* attributes. The proposal is to add
this to SVG elements too, following corresponding changes in the SVG
specification.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=921834
Link to standard:
https://svgwg.org/svg2-draft/types.html#__svg__SVGElement__dataset
(draft so far)
Platform coverage: All.
Estimated or target release: Firefox 51
Preference behind which this will be implemented: None.
WebKit and Blink before Chrome version 45 support .dataset on all
elements. Current Blink and Edge do not support this.
I'm adding some basic web platform tests in the patch in the bug.
-Boris
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