tabler.tabler/shared/includes/docs/ui/icon.html

{%- assign icon-name = include.icon -%}
{%- assign replace-to = "icon" -%}

{%- if include.class -%}
{%- assign replace-to = replace-to | append: ' ' | append: include.class -%}
{%- endif -%}

{%- assign replace-to = 'class="' | append: replace-to | append: '"' -%}

{%- assign svg-icon = icons[icon-name].svg.outline | default: '' -%}
{%- assign svg-icon = svg-icon | replace: '<path stroke="none" d="M0 0h24v24H0z" fill="none" />', '' -%}
{{ svg-icon | replace_regex: 'class=\"[^"]+\"', replace-to }}