where is documentation of Rspec?

I saw have_selector first time today. I want to learn it's options, so I went to official site.

But I can't find it anywhere.

• rspec-core
• rspec-expectation
• rspec-rails
• Relish

I used the search feature in each of the above sites, but in vain.

It's just a small, common method, right? But I can't even read it's API... where is it?

Edit: I use Webr开发者_C百科at. Now I know have_selector is from it. But seems no useful documentation.

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That is one of Capybara's Rspec matchers: Capybara::RSpecMatchers#have_selector.

You can use that method for querying the page for the existence of certain elements using css or xpath notation (examples from Capybara's Readme):

page.should have_selector('table tr')
page.should have_selector(:xpath, '//table/tr')