Is this jQuery?

If you hover the images, an orange magnifier pops up.

http://disqus.com/features/

Clicking on the images opens a pop up.

Is that a jQuery plugin that does this and the orange magnifier on hove开发者_StackOverflow社区r?

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No. it's just CSS's property (pseudo-class) :hover

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The magnifier is plain css :hover, while the popup is done using Facebox, which is a jQuery plugin.

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You can see the css for that effect here: http://mediacdn.disqus.com/1308880185/css/marketing.css

Search for #feature-explorer ul li:hover .frame span