Can't transition path's stroke-width

[matt-ts]

selection.transition().style("stroke-width", 10) does nothing. Here is a fiddle illustrating the problem, hovering over the red line should transition it to a wider line. https://jsfiddle.net/t26bn8k9/

I also wired in onclick to set the stroke-width without the transition, to show that this does work as expected.

For reference, here is the same example using d3.v3 and this one works. https://jsfiddle.net/v0a27zay/

Thanks, Matt

[mbostock]

CSS properties require units, so 10 is not a valid value; you must use '10px' instead. I didn't investigate why this worked in the past, but invalid values such as this are not supported.

[matt-ts]

Fabulous, thank you.