in lib/helpers/icons_helper.rb [18:32]
def icon(icon_name, size = nil, css_class = nil)
warn(" \e[33mWARN: '#{icon_name}' is not a known icon in @gitlab-org/gitlab-svg. Contact the Technical Writing team for assistance.\e[0m") unless known_sprites.include?(icon_name)
svg_class = [
'gl-icon',
'ml-1',
'mr-1',
"s#{size || 16}",
*css_class
].join(' ')
%(<svg role="img" aria-label="#{GITLAB_SVGS_MAPPING[icon_name]}" class="#{svg_class}"><use href="#{ICONS_SVG}##{icon_name}" /> <title>
end