under MacOS the HABPanel chart widget is not working (and was also not available ind widget list) in Safari and Chrome. It seems to be a a problem on MacOS - however I analyzed a bit further and found on Safari’s console following message
SyntaxError: Strict mode does not allow function declarations in a lexically nested statement.
I cloned HABPanel from git and commented the ‘use strict’ in chart.widget.js:2 out - as a “quick n dirty work around” - having done that the Chart widget seem to work.
May it is better to have a real fix and follow “use strict” ECMA rules ? (unfortunately i have no time/knowledge to fix it on myself )