# Check for a link that has a "disabled" class:
page.should have_css("a.my_link.disabled")
page.should have_xpath("//a[@class='disabled']")

# Check for a link that has a "disabled" attribute:
page.should have_css("a.my_link[disabled]")
page.should have_xpath("//a[@class='disabled' and @disabled='disabled']")

# Check that the element is visible
find("a.my_link").should be_visible
find(:xpath, "//a[@class='disabled']").should be_visible

find('#my_element')['class']
# => "highlighted clearfix some_other_css_class"

find('a#my_element')['href']
# => "http://example.com

# or in general, find any attribute, even if it does not exist
find('a#my_element')['no_such_attribute']
# => ""

# <a href="/clowns?ordered_by=clumsyness" class="weep">View Clowns</a>

page.should have_xpath("//a[@class='weep'][@href='/clowns?ordered_by=clumsyness']", :text => "View Clowns")

page.should have_link('View Clowns', :href => '/clowns?ordered_by=clumsyness')

page.should have_link('This will not work!', :href => '/clowns?ordered_by=clumsyness', :class => "weep")

expect(page).to have_link "Example"
expect(find_link("Example")[:disabled]).to be false

page.should have_link('It will work this way!', {:href => '/clowns?ordered_by=clumsyness', :class => "smile"})

<input type="text" id="disabled-false"            ></div>
<input type="text" id="disabled-true"     disabled></div>
<input type="text" id="disabled-js-true"          ></div>
<input type="text" id="disabled-js-false" disabled></div>
<script>
  document.getElementById('disabled-js-true').disabled = true
  document.getElementById('disabled-js-false').disabled = false
</script>

!all(:field, 'disabled-false',    disabled: false).empty? or raise
 all(:field, 'disabled-false',    disabled: true ).empty? or raise
 all(:field, 'disabled-true',     disabled: false).empty? or raise
!all(:field, 'disabled-true',     disabled: true ).empty? or raise
 all(:field, 'disabled-js-true',  disabled: true ).empty? or raise
 all(:field, 'disabled-js-false', disabled: false).empty? or raise

Capybara.current_driver = :poltergeist
!all(:field, 'disabled-false',    disabled: false).empty? or raise
 all(:field, 'disabled-false',    disabled: true ).empty? or raise
 all(:field, 'disabled-true',     disabled: false).empty? or raise
!all(:field, 'disabled-true',     disabled: true ).empty? or raise
!all(:field, 'disabled-js-true',  disabled: true ).empty? or raise
!all(:field, 'disabled-js-false', disabled: false).empty? or raise

let(:action_items) { page.find('div.action_items') }

it "action items displayed as buttons" do
  action_items.all(:css, 'a').each do |ai|
    expect(ai[:class]).to match(/btn/)
  end
end

expect(page).not_to have_selector(:link_or_button, 'Click here')

page.has_css?('.class_name')

page.has_css?('.class_name') do
  #some code
end

expect(find('#selector').disabled?).to be(true)