animate font weight css

1.weightGrow:hover {
2    text-shadow:
3    -1px -1px 0 #2DD785,
4    1px -1px 0 #2DD785,
5    -1px 1px 0 #2DD785,
6    1px 1px 0 #2DD785;
7    -webkit-transition: all .5s;
8    -moz-transition: all .5s;
9    -o-transition: all .5s;
10    transition: all .5s;
11}