Front-end web development is advancing rapidly, allowing developers to achieve tasks with HTML, CSS, and JavaScript that were unimaginable five years ago. However, the "Rule of Least Power," proposed by Tim Berners-Lee and Noah Mendelsohn in 2006, advocates for using the least powerful language necessary for a task to ensure flexibility and reusability. This principle is evident in modern development practices such as modularity and component-based structures, yet some contemporary best practices contradict this philosophy. The text discusses various scenarios where the Rule of Least Power can be applied, such as creating reusable data objects using JSON, utilizing static sites and serverless architectures for simplicity and speed, and adopting a "Markup-First Development" approach to ensure accessibility and analyzability. By adhering to the Rule of Least Power, developers can produce cleaner, more portable, and future-proof code.