Update src/H5F.js
Update src/H5F.js

- pattern method should return false (success) if val = placeholder
- valueMissing should return true (error) if type is checkbox/radio but is not checked
ourai/H5F,ourai/H5F,bowlinguru299/H5F,ganlanyuan/H5F,bowlinguru299/H5F,ganlanyuan/H5F,Banasura/H5F,ryanseddon/H5F,Banasura/H5F,ryanseddon/H5F,outfound/H5F,outfound/H5F