What functionality do Local Actions primarily utilize when executing on client machines?

Local Actions primarily utilize the execution of JavaScript code on client machines to enhance user interactions and experiences. This functionality allows developers to create dynamic and responsive interfaces within Salesforce applications. By leveraging JavaScript, Local Actions can manipulate the Document Object Model (DOM), respond to user inputs in real-time, and seamlessly incorporate custom logic that enhances the overall functionality while providing immediate feedback to users.

This client-side execution is particularly beneficial for tasks that require rapid interaction without incurring the latency associated with server calls, as it allows developers to perform tasks like data validation, calculations, and even UI modifications locally. By placing this execution power on the client-side, Local Actions improve performance and streamline the user experience.