Support percentage font sizing
Per discussion in https://forum.highcharts.com/post136670.html#p136670, it would be helpful if percentage font sizing was supported. It is good that dynamic sizing with the W3C-recommended "em" sizing is now supported. However, percentage sizing is also very common and may make even more sense conceptually for proportional sizing in dynamically sized charts. Internal support could either be direct percentage support or automatic conversion to currently supported em sizing.
Highcharts in Styled mode seems to work well with percentage font sizes: http://jsfiddle.net/highcharts/0pc7rvut/
I see. As of now, the font size itself works with percentage, but the bounding boxes seem to be handled wrong, so the chart layout is not optimal.
Actually that seems to be the case with em too: http://jsfiddle.net/highcharts/0pc7rvut/2/
Gary Geniesse commented
I understand your point of view with the shift to "styled mode". However, realistically, it's not practical to change entire legacy projects to "styled mode" simply to get around gaps in "non-styled mode".