Parameters
integer
Target tab id from browser_tabs, which lists tabs across all windows. Defaults to the agent’s most recently opened usable tab, or the only usable tab. Otherwise select a listed tabId.
enum
required
One of:
device, viewport, cpu, network, geolocation, media, locale, vision, animations, status, reset.string
device: iphone-14, iphone-se, pixel-7, ipad, desktop · network: none, offline, slow3g, fast3g, 4g
integer
integer
number
boolean
boolean
string
number
cpu: slowdown factor, 1 = none
number
number
number
boolean
enum
One of:
light, dark.enum
One of:
reduce, no-preference.enum
One of:
active, none.enum
One of:
more, less, no-preference.enum
One of:
screen, print.string
string
enum
One of:
none, achromatopsia, blurredVision, deuteranopia, protanopia, tritanopia, reducedContrast.number
boolean
device/viewport: also resize the browser window to the device size so the emulated viewport fills it (default true). reset restores the window.
Example
Device preset
Custom viewport
Dark mode and reduced motion
Throttle the CPU 4x