Lesson 7. Getting the Point Across with Messaging
HTML5 lets you send messages in a cross-window or cross-domain way; we’ll see how that works in this lesson.
Say, for example, that in page A, page B—which comes from the same directory on the server—appears in an <iframe> element. Now you can send text messages from page A to page B and make use of those messages in page B. That’s cross-window messaging.
In fact, page B can come from an entirely different domain and still appear in the <iframe> in page A, and you can still send messages to page A. That’s called cross-domain messaging, and it used to be prohibited, but now you can do it. So even if page B comes from an entirely different server than page A, you can still send page B messages. ...
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