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<html><head><style>div { background: yellow; border: 1px solid #cccccc; padding: 10px;}</style></head><body><p>This example uses the addEventListener() method to attach a "show" event to a menu element.</p><div contextmenu="mymenu"><p>Right-click inside this box to see the context menu!<menu type="context" id="mymenu"> <menuitem label="Refresh" onclick="window.location.reload();" icon="ico_reload.html"></menuitem> <menu label="Share on..."> <menuitem label="Twitter" icon="ico_twitter.png" onclick="window.open('//twitter.com/intent/tweet?text=' + window.location.href);"></menuitem> <menuitem label="Facebook" icon="ico_facebook.png" onclick="window.open('http://facebook.com/sharer/sharer.php?u=' + window.location.href);"></menuitem> </menu> <menuitem label="Email This Page" onclick="window.location='mailto:?body='+window.location.href;"></menuitem></menu></div><p><strong>Note:</strong> The show event is currently only supported in Firefox.</p><script>document.getElementById("mymenu").addEventListener("show", myFunction);function myFunction() { alert("The context menu is about to be shown");}</script></body>