Instead of a single hash in the left gutter, draw <n> hashes where <n> is the heading level. All of these hashes are part of the anchor text.  | 
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| .. | ||
| 000_reset.css | ||
| 010_anchors.css | ||
| 010_colors.css | ||
| 010_spacing.css | ||
| 010_structure.css | ||
| 010_typography.css | ||
| 099_breadcrumb.css | ||
| 099_content.css | ||
| 099_footnotes.css | ||
| 099_page_navigation.css | ||
| 099_page_summary.css | ||
| 099_site_header.css | ||