Addition of "url" option on Dialog

[kruncher]

When "url" is specified the dialog could automatically generate an IFRAME and present the indicated resource.

I would imagine that the following two options would also be desirable:

• "dialogiframeload" event type that is fired once IFRAME has finished loading.
• Automatically use title of document at "url" when no title (or null) is specified.

Possible usage?

var dialogElement = $.dialog({
    url: "http://www.jqueryui.com",
    // Assume "jQuery UI - Home" for title.
    title: null,
    width: 400,
    height: 200
});

[Scott González]

This is pretty simple to do manually and goes against the typical usage of jQuery UI.

[Scott González]

Also see #5300.