dotnet/src/webdriver/IWritableCapabilities.cs

// <copyright file="IWritableCapabilities.cs" company="Selenium Committers">
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namespace OpenQA.Selenium;

/// <summary>
/// Capabilities of the browser that you are going to use
/// </summary>
public interface IWritableCapabilities : ICapabilities
{
    /// <summary>
    /// Sets a capability of the browser.
    /// </summary>
    /// <param name="capability">The capability to set.</param>
    /// <param name="capabilityValue">The value for the capability.</param>
    void SetCapability(string capability, object capabilityValue);

    /// <summary>
    /// Gets this capabilities object as a read-only object.
    /// </summary>
    /// <returns>The capabilities object as a read-only object.</returns>
    ICapabilities AsReadOnly();
}