# Field notes
> Field notes is the Device Lab's study series. The first study covers a dated iOS 18.6.2 run on an iPhone 16 Pro, with method, results, limits and open data.
import LabStudies from '@components/lab/LabStudies.astro';
import LabProvenance from '@components/lab/LabProvenance.astro';
Field notes is the series of studies written from Device Lab runs. A study describes what was tested, how it was tested, and the evidence behind the results on the [behaviour pages](/lab/behaviour/). It also records mistakes during the run and the limits of the results. The first study includes a data package of reads, screenshots, a recording, and file hashes. Each result identifies its evidence as an instrumented read, a screenshot or recording, or the operator's report alone.
## Studies
The first study covers the iOS 18.6.2 baseline on an iPhone 16 Pro (build 22G100), run on 2026-10-20. The [study page](/research/2026-10-ios18-home-screen-web-apps/) holds the method, the results tables and the limitations; the [data package](/research/2026-10-ios18-home-screen-web-apps/data/) holds the notebook (entries N01 to N66), the raw reads, the probe scripts, the screenshots and the recording, under CC BY 4.0. The article [Testing Home Screen web apps on iOS 18.6.2](/news/testing-home-screen-web-apps-on-ios-18-6-2/) describes the same run for a general reader. The prior-art check found no earlier description of two findings: `'onnotificationclick' in self` is true in a worker controlled by a Home Screen app and false in the same worker controlled by a Safari tab, and `window.pushManager` exists in a plain Safari tab. Most of the other results confirm published descriptions with dated measurements.