Declarative shadow DOMThe shadowrootmode attribute on <template> creates a shadow root without the use of JavaScript. It is a declarative alternative to the attachShadow() method.htmlHTMLwidely2024-02-202026-08-20https://html.spec.whatwg.org/multipage/scripting.html#attr-template-shadowrootmodedeclarative-shadow-domhttps://developer.mozilla.org/docs/Web/API/HTMLTemplateElement/shadowRootModeapi.HTMLTemplateElement.shadowRootClonableapi.HTMLTemplateElement.shadowRootDelegatesFocusapi.HTMLTemplateElement.shadowRootModeapi.HTMLTemplateElement.shadowRootSerializableapi.HTMLTemplateElement.shadowRootSlotAssignmenthtml.elements.template.shadowrootclonablehtml.elements.template.shadowrootdelegatesfocushtml.elements.template.shadowrootmodehtml.elements.template.shadowrootserializablehttps://nowyoucanuse.com/features--declarative-shadow-dom.html