halo not transparent when explicit color

[iweindesmedt]

http://jsfiddle.net/LLExL/2680/

i think it would be expected that the halo is transparent

[TorsteinHonsi]

Highcharts is only able to change the opacity of colors given in the hex or rgb(a) formats. See http://www.highcharts.com/docs/chart-design-and-style/colors/.

I've added this information to the API on halo.opacity.

Fixing this would mean that we would have to extend Highcharts with a list of full HTML color alias names, which will add to the filesize.

Another convenient approach would be to supply a plugin that allows implementers to use color names, but that requires a rewrite of the Color object to make it extendable.

[oysteinmoseng]

Seems to be working as expected now (http://jsfiddle.net/LLExL/12425), though I don't remember us adding support for this anywhere @TorsteinHonsi? Looks like fill-opacity is added to the halo, which seems to do the job well, even with named fills.