ifhascontent compatibility

[NikkyAI]

are ifhascontent and if `elsif compatible
or is there a elsif equivalent?

or can i do for example this?

 {% ifhascontent background or page.background_enabled %}
    <div id="{{id}}" class="parallax__layer parallax__layer--back1">
        {% contentblock background | markdownify %}
    </div>
    {% endifhascontent %}

or

 {% ifhascontent background %}
 {% elsifhasconent %}
 {% endifhascontent %}

and can those tags be made useable in the if tag ?