'id' attribute in a loop each (3dio-inspector-plugins.js, str 260)

[1flyby]

h1, everyone! I found something strange in code of inspector-plugins,
this is from 3dio-inspector-plugins.js, str 260.

Object.keys(plugins).forEach(function (name) {
	    var pluginButton = el('<div>', {
	      id: 'io3d-inspector-plugins___plugins-menu___button',
	      html: plugins[name].displayTitle,
	      click: function () {
	        showPlugin(name);
	      }
	    });
	    pluginButton.addEventListener('click', function () {

	    });
	    menuEl.append(pluginButton);
	  });

why here is 'id' for each?