code: def element_should_be_visible(self, locator, loglevel='INFO'):
          
          if not self._element_find(locator, True, True).is_displayed():
              self.log_source(loglevel)
              raise AssertionError("Element '%s' should be visible "
                                   "but did not" % locator)
docs: Verifies that element identified with locator is visible.
          
          Key attributes for arbitrary elements are `id` and `name`. See
          `introduction` for details about locating elements.
          
          New in AppiumLibrary 1.4.5