Configuration:

Save Filter State (filter keeps selection after page reload)
Auto-apply (callback is executed automatically on each filter change)
JSON output: 
Position Material Weight Symbol
1 Hydrogen 1.0079 H
2 Helium 4.0026 He
3 Lithium 6.941 Li
4 Beryllium 9.0122 Be
5 Boron 10.811 B
6 Carbon 12.0107 C
7 Nitrogen 14.0067 N
8 Oxygen 15.9994 O
9 Fluorine 18.9984 F
10 Neon 20.1797 Ne
11 Sodium 22.9897 Na
12 Magnesium 24.305 Mg
13 Aluminum 26.9815 Al
14 Silicon 28.0855 Si
15 Phosphorus 30.9738 P
16 Sulfur 32.065 S
17 Chlorine 35.453 Cl
18 Argon 39.948 Ar
19 Potassium 39.0983 K
20 Calcium 40.078 Ca