DriverOptionsAddAdditionalCapability Method WebDriver
Provides a means to add additional capabilities not yet added as type safe options for the specific browser driver.

Namespace: OpenQA.Selenium
Assembly: WebDriver (in WebDriver.dll) Version: 3.1.0
Syntax

public abstract void AddAdditionalCapability(
	string capabilityName,
	Object capabilityValue
)

Parameters

capabilityName
Type: SystemString
The name of the capability to add.
capabilityValue
Type: SystemObject
The value of the capability to add.
Exceptions

ExceptionCondition
ArgumentException thrown when attempting to add a capability for which there is already a type safe option, or when capabilityName is or the empty string.
Remarks

Calling AddAdditionalCapability(String, Object) where capabilityName has already been added will overwrite the existing value with the new value in capabilityValue.
See Also

Reference