/*
mp.setAttribute("onpopupshowing", "this.updateMenu();");
mp.setAttribute("oncommand", "if(!event.button) this.handleEvent(event);"); // Ignore middle-click in Firefox 89+
mp.setAttribute("onmousedown", "if(event.button == 0) this.handleEvent(event);");
mp.setAttribute("onclick", "if(event.button > 0) this.handleEvent(event);");
mp.setAttribute("oncontextmenu", "return false;");
mp.setAttribute("onpopuphidden", "this.destroyMenu();");
*/
addEventListener("popupshowing", () => mp.updateMenu(), false, mp);
addEventListener("command", mp.onmousedown = mp.onclick = e => {
	if (!e.button || e.type.endsWith("k")) mp.handleEvent(e);
}, false, mp);
mp.toggleAttribute("context");
addEventListener("popuphidden", () => mp.destroyMenu(), false, mp);