Math
Surprisingly, computers have slightly different ways of calculating. Some calculations utilize inprecise approximations for certain operations. The Math component uses this and instructs the browser to calculate a handful of numbers.
This isn't a great source of entropy, but it does provide some added information.
Example
"math": {
"acos": 1.0471975511965979,
"asin": -9.614302481290016e-17,
"cos": -4.854249971455313e-16,
"largeCos": 0.7639704044417283,
"largeSin": -0.6452512852657808,
"largeTan": -0.8446024630198843,
"sin": -1.9461946644816207e-16,
"tan": 6.980860926542689e-14
},
Code
Check out the implementation