{% macro book_cover(book, alt=None) -%} {%- set image_title = book.title if
book.title else book.name -%} {%- set image_alt = alt if alt else image_title
-%} {% set srcset = book|get_cover_srcset %}
{%- endmacro %} {% macro series(series, alt=None) -%} {%- set image_alt = alt if
alt else image_title -%} {% set srcset = series|get_series_srcset %}
{%- endmacro %}