js

// We create a closed shadow root, that is not accessible
let element = document.createElement("div");
element.attachShadow({ mode: "closed" });
element.shadowRoot; // null as the shadow root is closed

// We create an open shadow root, that is accessible
let element2 = document.createElement("div");
element2.attachShadow({ mode: "open" });
console.log(`The shadow is ${element2.shadowRoot.mode}`); // logs "The shadow is open"
element2.shadowRoot.textContent("Opened shadow"); // The shadow is open, we can access it from outside