Edit in JSFiddle

Ext.onReady(function() {
    new Ext.Panel({
        renderTo: Ext.getBody(),
        title: '3 Ways to render HTML inside of a ExtJS container',
        items: [{
            html: "<a href='#'>1. HTML property of a panel</a>",
            xtype: "panel"},
        {
            xtype: "panel",
            html: new Ext.XTemplate("<a href='#'>{value}").apply({
                value: '2. HTML property of a panel generated by an XTemplate'
            })},
        {
            xtype: 'box',
            autoEl: {
                tag: 'a',
                html: '3. Dom element created by a DomHelper and wrapped as Component',
                href: '#'
            }}]
    });
});