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If the slot's content isn't defined when the element is included in the markup, or if the browser doesn't support slots, just contains the fallback content "My default text". To define the slot's content, we include an HTML structure inside the element with a slot attribute whose value is equal to the name of the slot we want it to fill. As before, this can be anything you like, for example: my-paragraph > span slot = " my-text " > Let's have some different text! span > my-paragraph > my-paragraph > ul slot = " my-text " > li > L