Edit in JSFiddle

<p>Click to select one or several item</p>
<d-linear-layout id="container">
    <d-list selectionMode="multiple">
    { "label" : "first item" },
    { "label" : "second item" },
    { "label" : "third item" },
    { "label" : "fourth item" },
    { "label" : "fifth item" }
    </d-list>
</d-linear-layout>

require.config({
    baseUrl: "http://ibm-js.github.io/libraries/master/"
});
require(["deliteful-build/layer"], function () {
    require([
        "deliteful/list/List",
        "deliteful/LinearLayout",
        "requirejs-dplugins/css!delite/themes/defaultapp.css",
        "requirejs-domready/domReady!"
    ], function (register) {
        document.body.style.display = "";
    });
});

/* CSS to add a selection mark on the default item renderer */
.d-multiselectable .d-selected .d-list-item-icon::before {
    content: "\2713";
    padding-left: 5px;
}

#container {
    width: 100%;
    height: 100%;
}