iPhone Duo / iPhone 17
Compare what the browser exposes on first load. Open this same file on each phone with Safari settings at their defaults. On Duo, start closed; then change the screen arrangement and watch the live readings. No settings are changed and no permission prompts are requested.
The initial snapshot is captured once, as soon as this page’s script runs, before interaction. A reload creates a new initial snapshot. Browser differences are leads to investigate, not proof of a device model. This page cannot verify whether feature flags are at their defaults.
Initial snapshot · preserved for this page load
Live readings
Viewport segments
Visual viewport & layout
Screen
CSS support & media queries
Report preview / manual copy fallback
If clipboard access is unavailable for local files, select and copy this report.
All measurements stay on this page until you copy or download them. No external assets or network requests. CSS syntax support alone does not establish that a feature is exposed; computed environment values and matching queries are recorded separately. A missing environment value uses a sentinel and is reported as null.