[css] Same font except its weight seems different on different browsers

I collected and tested discussed solutions:

Windows10 Prof x64:

* FireFox v.56.0 x32 
* Opera v.49.0
* Google Chrome v.61.0.3163.100 x64-bit

macOs X Serra v.10.12.6 Mac mini (Mid 2010):

* Safari v.10.1.2(12603.3.8)
* FireFox v.57.0 Quantum
* Opera v49.0

Semi (still micro fat in Safari) solved fatty fonts:

text-transform: none; // mac ff fix
-webkit-font-smoothing: antialiased; // safari mac nicer
-moz-osx-font-smoothing: grayscale; // fix fatty ff on mac

Have no visual effect

line-height: 1;
text-rendering: optimizeLegibility; 
speak: none;
font-style: normal;
font-variant: normal;

Wrong visual effect:

-webkit-font-smoothing: subpixel-antialiased !important; //more fatty in safari
text-rendering: geometricPrecision !important; //more fatty in safari

do not forget to set !important when testing or be sure that your style is not overridden

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