Detect web-vitals
The web-vitals JavaScript is a tiny, modular library for measuring all the web vitals metrics on real users.
Detection looks at script sources, javascript globals, inline scripts across 3 fingerprint rules among the site's public responses.
01
Websites using web-vitals
Loading website list…
02
Signal classes
PluginView evaluates public page signals in these classes when identifying web-vitals. Individual fingerprint rule bodies are proprietary and are not published.
- Script sources
- JavaScript globals
- Inline scripts
03
Example public indicators for web-vitals
Illustrative indicators derived from public catalog metadata for web-vitals. A live scan may match additional proprietary rules beyond these examples.
- web-vitals@/dist/web-vitals.*.js
- webVitals
- 89999999999991e12largest-contentful-paintfirst-inputlayout-shiftlargest…
04
What a detection means
- Establishes
- One or more public signals on the scanned page matched a known web-vitals signature (3 rules) at the time of the scan.
- Does not establish
- A sitewide install of web-vitals, an active vendor contract, exclusive use, or that web-vitals is still in place today.
05
How to check a site for web-vitals
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest web-vitals signals.
- 2. PluginView reads only public responses (script sources, javascript globals, inline scripts) and scores them against the web-vitals signature set (3 rules).
- 3. Review the confidence score and text explanation for web-vitals on the results page.
06
FAQ: detecting web-vitals
- Can PluginView detect web-vitals without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for web-vitals — typically script sources, javascript globals, inline scripts. It does not bypass authentication or paywalls.
- What category is web-vitals?
- web-vitals is classified under JavaScript libraries, RUM in the PluginView directory.
- How many fingerprint rules cover web-vitals?
- This reference currently tracks 3 fingerprint rules across script sources, javascript globals, inline scripts. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses web-vitals?
- Illustrative public indicators for web-vitals include web-vitals@/dist/web-vitals.*.js; webVitals; 89999999999991e12largest-contentful-paintfirst-inputlayout-shiftlargest…. A live scan may match additional proprietary rules beyond these examples.
