An error was observed in the web based version (which is not in production) relating to valid colour values.

[PeterWithers]

An error occurred: (SyntaxError) : Failed to execute 'addColorStop' on 'CanvasGradient': The value provided ('rgba(0,0,0,0);') could not be parsed as a color.

[PeterWithers]

It seems that Chrome cannot have a ; when using addColorStop.
This works: addColorStop(1, 'hsl(0,100%,50%)');
This does not: addColorStop(1, 'hsl(0,100%,50%);');

Presumably this does not affect the mobile web views that we have developed this app for. So this will only affect some web browsers when using the application as a web app and not affect the mobile app.