All you see in the DOM is the element, but it contains a series of buttons and other controls inside its shadow DOM. Think for example of a element, with the default browser controls exposed. Note that the shadow DOM is not a new thing by any means - browsers have used it for a long time to encapsulate the inner structure of an element. The difference is that none of the code inside a shadow DOM can affect anything outside it, allowing for handy encapsulation. You can affect the nodes in the shadow DOM in exactly the same way as non-shadow nodes - for example appending children or setting attributes, styling individual nodes using, or adding style to the entire shadow DOM tree inside a element. Shadow root: The root node of the shadow tree.Shadow boundary: the place where the shadow DOM ends, and the regular DOM begins.Shadow tree: The DOM tree inside the shadow DOM.Shadow host: The regular DOM node that the shadow DOM is attached to.There are some bits of shadow DOM terminology to be aware of: Shadow DOM allows hidden DOM trees to be attached to elements in the regular DOM tree - this shadow DOM tree starts with a shadow root, underneath which you can attach any element, in the same way as the normal DOM. This fragment produces the following DOM structure:
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