Could we define the string a class variable so this selector can accessed from outside the page object?
```ruby
@@heading = 'h1'
element :heading, @@heading
```
It will be useful to force capybara to wait for the full page load (sometimes) with synchronised matcher like ```have_*```.
Currently site_prism check if an element is present on the page by using the ```has_***?``` methods which does not wait for the page to be fully loaded and cause inconsistent test failures.