HTML: class: what does it mean?

Hello Experts,

when I visit a site, the root element <html> has a sub element called class.
example below:

<html class="js no-touch svg wf-franklinitcprobold-n4-active wf-franklinitcprolight-n4-active wf-georgiapro-n4-active wf-georgiaproblack-n4-active wf-georgiaprocond-n4-active wf-georgiaprolight-n4-active wf-georgiaprosemibold-n4-active wf-active" lang="en" data-useragent="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.122 Safari/537.36 OPR/24.0.1558.64" data-platform="Win32">

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What does it mean and how does it get set?

Thanks for your help....

Regards,
epifanio67Asked:
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GaryCommented:
It's for setting css on the whole page and for use in other things like javascript
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epifanio67Author Commented:
hmmm.... thank you Gary...
I noticed the html class some times it shows
js
no-js
touch
no-touch

how are these set? or part of the html class?
see what I mean?
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GaryCommented:
They are usually set by and for javascript plugins that do different things if the device has touch screen
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epifanio67Author Commented:
Thanks Gary
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