HTMLDialogElement: showModal() method - Web APIs | MDN
The showModal() method of the HTMLDialogElement interface displays the dialog as a modal, over the top of any other dialogs that might be present. It displays in the top layer, along with a ::backdrop pseudo-element. Elements inside the same document as the dialog, except the dialog and its descendants, become inert (as if the inert attribute is specified). Only the containing document becomes blocked; if the dialog is rendered inside an iframe, the rest of the page remains interactive.| developer.mozilla.org
