[parser] properly removed self-closing tag support
[parser] properly removed self-closing tag support

also replaced call to `Array#slice` with setting the stack's `length`
property

frontapp/htmlparser2,mail-apps/htmlparser2,jasonsanjose/htmlparser2,jasonsanjose/htmlparser2,magicode/htmlparser2,frontapp/htmlparser2,mail-apps/htmlparser2,magicode/htmlparser2,kirbysayshi/node-htmlparser,broadly/htmlparser2,broadly/htmlparser2,fasterize/node-htmlparser