Defining IDs in XHTML, Classs are all used, mainly the aspect CSS defines the style to be able to wear at a glance. So, CSS naming is for reference only.
(1) Page structure class
Container: Container
Page Header: Header
Content: Content/container
Page body: Main
Page End: Footer
Navigation: Nav
Sidebar: Sidebar
Column: Column
Page perimeter control overall layout width: Wrapper
(2) Navigation class
Navigation: Nav
Main navigation: Mainnav
Sub-navigation: Subnav
Top Navigation: Topnav
Edge Navigation: Sidebar
Left navigation: Leftsidebar
Right navigation: Rightsidebar
Location Navigation: Crumb
Menus: Menu
Sub-menu: submenu
Breadcrumbs: breadcrumb (that is, the location of the page navigation tips)
(3) Web content class
Titles: Title
Summary: summary
Arrows: Arrow
Trademarks: Label
Website Logo: Logo
Corner/Fillet: Corner
Banner ad: Banner
Column: Column
Sub-menu: submenu
Search on: Search
Search box: SearchBox
Login: Login
Tool bar: Toolbar
Dropdown: Drop
tab page: Tab
Currently: current
Lists: List
Scrolling: Scroll
Services: Service
Tip Message: Msg
News
Tips: Tips
Download: Download
Column Title: Title
Hotspot: Hot
Add: Joinus
Registration: Regsiter
Guide: Guide
Friendship Link: friendlink
State: Status
Copyrights: Copyright
Button: BTN
PARTNER: Partner
Vote: Vote