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invalid-links

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Use when auditing a page's link elements for crawlability, reviewing JavaScript-heavy SPAs where navigation may not use `<a href>` tags, or checking that dynamically generated links have valid href values.

skills/invalid-links/SKILL.md

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# Fix invalid links

Google can only follow links declared as valid `<a href>` elements with crawlable URL values. Invalid links — empty hrefs, JavaScript voids, or non-URL content — prevent PageRank from flowing to linked pages and stop Googlebot from discovering those destinations.

## Quick Reference

- Invalid `<a>` tags (empty href, JavaScript voids, non-URL values) are not crawlable — Googlebot cannot follow them
- Links must use crawlable `<a href='...'>` elements with valid absolute or relative URLs to pass PageRank and be followed
- JavaScript-only navigation (onClick handlers without `href`) is invisible to search engine crawlers

## Check

Parse all `<a>` elements on the page. Flag links where `href`: (1) is empty (`href=''` or `href='#'` with no meaningful target). (2) starts with `javascript:` (e.g., `href='javascript:void(0)'`). (3) starts with `mailto:` or `tel:` — these are valid but not crawlable for page discovery. (4) contains only a fragment identifier that references an anchor not present on the page. (5) is absent entirely (`<a>` without any href attribute). Report the count per type.
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