How do I install a visitor ID tag on 11ty (Eleventy)?
On 11ty (Eleventy), your visitor identification tag goes in: Template file (Nunjucks/Liquid) or eleventy.config.js via addNunjucksTag() / addLiquidTag() for custom tags. The install itself takes minutes; the part that goes wrong on 11ty (Eleventy) is below.
Where the tag goes
- Template file (Nunjucks/Liquid) or eleventy.config.js via addNunjucksTag() / addLiquidTag() for custom tags.
- Paste your vendor’s tag snippet exactly as issued. Do not wrap it in extra script tags or reformat it.
- Publish or deploy, then verify (below) before trusting data.
What breaks visitor tracking on 11ty (Eleventy)?
Custom tags in 11ty are template-syntax level; for HTML script tags, place directly in template or use shortcodes instead.
How do you verify the tag fires?
npm run build, inspect _site/*.html for <script> tag, serve and check DevTools.
Then run through the labeled QA checklist before you rely on the numbers, and set expectations with the match-rate calculator — no vendor identifies every visitor.