{%- assign default_paths = site.pages | map: "path" -%}
{%- assign page_paths = site.header_pages | default: default_paths -%}
{%- assign titles_size = site.pages | map: 'title' | join: '' | size -%}
{%- for path in page_paths -%}
{%- assign my_page = site.pages | where: "path", path | first -%}
{%- if my_page.title -%}
{{ my_page.title | escape }}
{%- endif -%}
{%- endfor -%}