It seems the :first-letter don't work

[garyyan]

It seem the :first-letter don't work,for example:

var html="<h3>1abc</h3>"
var css="h3:first-letter{color:red}"
output=juice.inlineContent(html, css,{inlinePseudoElements:true});

but don't find the the output include the first-letter style.
have any other additional things I want to do?please give me some advise,thanks a lot.