TypeScript definition for HTMLDialogElement based on MDN documentation

HTMLDialogElement.d.ts

/**
 * HTMLDialogELement
 * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLDialogElement
 */
interface HTMLDialogElement extends HTMLElement {
    /**
     * Reflects the open HTML attribute,
     * indicating that the dialog is available for interaction.
     */
    open:boolean;
    /**
     * Gets/sets the return value for the dialog.
     */
    returnValue:string;
    /**
     * Closes the dialog. An optional DOMString may be passed as an argument,
     * updating the returnValue of the the dialog.
     */
    close():void
    /**
     * Displays the dialog modelessly, i.e. still allowing interaction with content outside of the dialog.
     * An optional Element or MouseEvent may be passed as an argument,
     * to specify an anchor point to which the dialog is fixed.
     */
    show():void
    /**
     * Displays the dialog for exclusive interaction, over the top of any other dialogs that might be present.
     * An optional Element or MouseEvent may be passed as an argument,
     * to specify an anchor point to which the dialog is fixed.
     */
    showModal():void
}