dotnet/src/webdriver/ICapabilities.cs

// <copyright file="ICapabilities.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
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// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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using System;

namespace OpenQA.Selenium;

/// <summary>
/// Capabilities of the browser that you are going to use
/// </summary>
public interface ICapabilities
{
    /// <summary>
    /// Gets the capability value with the specified name.
    /// </summary>
    /// <param name="capabilityName">The name of the capability to get.</param>
    /// <returns>The value of the capability.</returns>
    /// <exception cref="ArgumentException">
    /// The specified capability name is not in the set of capabilities.
    /// </exception>
    object this[string capabilityName] { get; }

    /// <summary>
    /// Gets a value indicating whether the browser has a given capability.
    /// </summary>
    /// <param name="capability">The capability to get.</param>
    /// <returns>Returns <see langword="true"/> if the browser has the capability; otherwise, <see langword="false"/>.</returns>
    bool HasCapability(string capability);

    /// <summary>
    /// Gets a capability of the browser.
    /// </summary>
    /// <param name="capability">The capability to get.</param>
    /// <returns>An object associated with the capability, or <see langword="null"/>
    /// if the capability is not set on the browser.</returns>
    object? GetCapability(string capability);
}