Unexpected result with html tag and body tag

~~~

describe 'unexpected wrong result' do
  it 'MUST be TRUE with negative and html' do
    expect("<p>My paragraph.</p>").not_to have_tag 'html' # => failure !ERROR!
  end
  it 'MUST be TRUE with negative and body' do
    expect("<p>My paragraph.</p>").not_to have_tag 'body' # => failure !ERROR!
  end
end

~~~
