1. ::part() css pseudo-element is useful for 'allowing shadow hosts to selectively expose chosen elements from their shadow tree to the outside page for styling purposes.' The tab example here (https://developer.mozilla.org/en-US/docs/Web/CSS/::part) is a perfect situation for
3. Shadow DOM is used primarily to modularize styling.
4. ShadowRoot.
5. <slot> can be used to dynamically add html.
::part().
2. connectedCallback is invoked each time the custom element is appended into a document-connected element so its useful when initializing. 3. Shadow DOM is used primarily to modularize styling.
4. ShadowRoot.
5. <slot> can be used to dynamically add html.