I'm trying to set a specific line width on a line series, in a chart which has styledMode switched on. (Styled mode is necessary for us, to eliminate in-line styles which are causing Content-Security-Policy errors.)
I find that the stroke color from my style is correctly applied to the line, but the stroke-width setting is ignored, even if I mark it as !important.
Jsfiddle: http://jsfiddle.net/tsjLg95w/
You can edit the stroke value to prove that the style is being applied.