core/html/HTMLDialogElement.idl

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// https://html.spec.whatwg.org/#the-dialog-element

interface HTMLDialogElement : HTMLElement {
    [Reflect] attribute boolean open;
    attribute DOMString returnValue;
    // FIXME: show() and showModal() should take an anchor argument.
    void show();
    [RaisesException] void showModal();
    // FIXME: The returnValue argument should have no default value.
    [RaisesException] void close(optional DOMString returnValue = null);
};