For each input on the left, this table lists what happens when you pass it into a CSS property and retrieve its value back. The third column indicates whether the value was round-tripped faithfully.
Basic floats
'0.0001' 0.0001 pass
0.0001 0.0001 pass
'123456.123456' 123456 pass
'1234567.1234567' 1.23457e+06 pass
'12345678.12345678' 1.23457e+07 pass
Trailing zeros
'0.00100000' 0.001 pass
'0.001000001' 0.001 pass
'0.12345000001' 0.12345 pass
'0.12304567' 0.123046 pass
'0.12340567' 0.123406 pass
'0.12345067' 0.123451 pass
'0.12345607' 0.123456 pass
'0.12345670' 0.123457 pass
Repeating decimals
1/3 0.333333 pass
123 + 1/3 123.333 pass
13/99 0.131313 pass
123 + 13/99 123.131 pass
100/999 0.1001 pass
123 + 100/999 123.1 pass
Large numbers
12345678 1.23457e+07 pass
123456789 1.23457e+08 pass
1234567890 1.23457e+09 pass
12345678901 1.23457e+10 pass
123456789012 1.23457e+11 pass
1234567890123 1.23457e+12 pass
12345678901234 1.23457e+13 pass
123456789012345 1.23457e+14 pass
1234567890123456 1.23457e+15 pass
12345678901234567 1.23457e+16 pass
Weird numbers
Number.NaN 1.23457e+16 pass
1/0 1.23457e+16 pass
Math.sqrt(-1) 1.23457e+16 pass
1/0.9999 1.0001 pass
1/0.99999 1.00001 pass
1/0.999999 1 pass
1/0.9999999 1 pass
1/0.99999999 1 pass
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