Shadow DOM

Shadow DOM is a web technology that allows developers to create self-contained parts of a webpage. These parts, called "shadow trees," have their own DOM (structure) and styles, isolated from the rest of the page. This means the inside of a Shadow DOM won’t be affected by external styles or scripts, and vice versa. It’s useful for building reusable, modular components—like custom widgets—that behave consistently, without interference from the webpage's main code. In essence, Shadow DOM ensures that complex UI parts stay encapsulated and predictable, making web development more manageable and organized.