Conditional liquid code not working

Store Design
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2

try with elseif

{%- when 'popup' -%}
              {% comment %} MGO: Show Chart Table if not empty {% endcomment %}            
              {%- if product.metafields.custom.size_chart != blank -%}
                
                              
                
                  {{- block.settings.text -}}
                

             {%- elsif product.metafields.custom._handmade_and_custom_made_to_order != blank -%}
                
                              
                
                  {{- block.settings.text -}}
                
            {%- endif -%}