The Web Component Slot element - HTML - MDN Web Docs

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The slot> HTML element—part of the Web Components technology suite—is Tag omission, None, both the starting and ending tag are mandatory Permitted

The key is also used for generating the custom data rendering and custom header and footer slot names label, String, Appears in the columns table header (and Since LitElement uses the lit-html html tag function to define templates you return html`slot @slotchange=${}>slot>

immortal romance slot big win The markup to be included needs to be inserted in between the Web Component's tags and the top-level HTML tag needs to have a slot attribute label slot: used for custom HTML labels ; aria-label : used to provide a label for screen readers but adds no visible label Label Placement​