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.