Definition
Web Install defines HTMLInstallElement
[Exposed=Window]
interface HTMLInstallElement : HTMLElement {
[HTMLConstructor] constructor();
[CEReactions, ReflectURL] attribute USVString manifest;
[CEReactions, ReflectURL] attribute USVString manifestId;
readonly attribute boolean isValid;
readonly attribute DOMString invalidReason;
attribute EventHandler onvalidationstatuschange;
};