Detect Intersection Observer
Intersection Observer is a browser API that provides a way to observe the visibility and position of a DOM element relative to the containing root element or viewport.
Detection looks at script sources across 2 fingerprint rules among the site's public responses.
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Websites using Intersection Observer
Loading website list…
02
Signal classes
PluginView evaluates public page signals in these classes when identifying Intersection Observer. Individual fingerprint rule bodies are proprietary and are not published.
- Script sources
03
Example public indicators for Intersection Observer
Illustrative indicators derived from public catalog metadata for Intersection Observer. A live scan may match additional proprietary rules beyond these examples.
- cdn.jsdelivr.net/npm/intersection-observer@
- assets/.?intersection-observer..js
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Intersection Observer signature (2 rules) at the time of the scan.
- Does not establish
- A sitewide install of Intersection Observer, an active vendor contract, exclusive use, or that Intersection Observer is still in place today.
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How to check a site for Intersection Observer
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Intersection Observer signals.
- 2. PluginView reads only public responses (script sources) and scores them against the Intersection Observer signature set (2 rules).
- 3. Review the confidence score and text explanation for Intersection Observer on the results page.
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FAQ: detecting Intersection Observer
- Can PluginView detect Intersection Observer without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Intersection Observer — typically script sources. It does not bypass authentication or paywalls.
- What category is Intersection Observer?
- Intersection Observer is classified under Performance, JavaScript libraries in the PluginView directory.
- How many fingerprint rules cover Intersection Observer?
- This reference currently tracks 2 fingerprint rules across script sources. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Intersection Observer?
- Illustrative public indicators for Intersection Observer include cdn.jsdelivr.net/npm/intersection-observer@; assets/.?intersection-observer..js. A live scan may match additional proprietary rules beyond these examples.
