hpricot：An Hpricot Showcase：Hpricot CSS Search：Selecting by ID

everyday Ruby 
>> require "hpricot"
=> true
>> doc = Hpricot('<div id="menu"></div>')
=> #<Hpricot::Doc {emptyelem <div id="menu">}>
>> doc.search('#menu')
=> #<Hpricot::Elements[{emptyelem <div id="menu">}]>
>> doc = Hpricot('<div id="menu"></div><div id="menu"></div>')
=> #<Hpricot::Doc {emptyelem <div id="menu">} {emptyelem <div id="menu">}>
>> doc.search('#menu')
=> #<Hpricot::Elements[{emptyelem <div id="menu">}]>
>> doc = Hpricot('<div id="menu2"></div>')
=> #<Hpricot::Doc {emptyelem <div id="menu2">}>
>> doc.search('#menu')
=> #<Hpricot::Elements[]>