this is a bug fix,my vim version is v7.3.547,os is ubuntu
13.04,zencoding version is the latest code of master on github.
when I use <c-y>a/A to make an anchor from URL,the tag 'a' do not have
 'href' attribute.that is,your website http://mattn.kaoriya.net/ will
become '<a>Big Sky<a>' instead of '<a
href="http://mattn.kaoriya.net/">Big Sky</a>'.I don't familiar with the
sourcecode of zen-coding and not very good at vimscript,so I only read
the relate functions :
function! zencoding#anchorizeURL(flag),function! zencoding#toString(...)
  in /autoload/zencoding.vim,
function! zencoding#lang#html#toString(settings, current, type, inline,
    filters, itemno, indent) in /autoload/zencoding/lang/html.vim,
function! zencoding#util#unique(arr) in autoload/zencoding/util.vim.I
find the reason why 'href' attribute is missed is because the
attrs_order array is empty,this variable is not assigned,I assign the
variable in the function zencoding#anchorizeURL(flag) in
/autoload/zencoding.vim,it works,the tag is correct.
but I do not know whether is this a common problem or the best way to
fix the bug,please pay some attention to the <c-y>a/A problem.
This is my first time to fork project and push code,I'm not sure whether
it is the proper way to do this to report the bug.
By the way,I like this plugin,it's really cool.
I'm not very good at English,hope you can know what I mean.