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Web Messaging or cross-document messaging, is an API introduced in the WHATWG HTML5 draft specification, allowing documents to communicate with one another across different origins, or source domains.〔 Prior to HTML5, web browsers disallowed cross-site scripting, to protect against security attacks. This practice barred communication between non-hostile pages as well, making document interaction of any kind difficult.〔〔 Cross-document messaging allows scripts to interact across these boundaries, while providing a rudimentary level of security. ==Requirements and attributes== Using the Messaging API's postMessage method, plain text messages can be sent from one domain to another.〔 This requires that the author first obtain the Window object of the receiving document. As a result, messages can be posted to the following:〔* other frames or iframes within the sender document's window * windows the sender document explicitly opens through JavaScript calls * the parent window of the sender document * the window which opened the sender document The message event being received has the following attributes:* data - The data, or actual content, of the incoming message.* origin - The origin of the sender document. This typically includes the scheme, hostname and port. It does not include the path or fragment identifier.〔* source - the WindowProxy of where the document came from (the source window).postMessage is not a blocking call; messages are processed asynchronously〔http://www.w3.org/TR/2010/WD-webmessaging-20101118/#web-messaging〕.抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Web Messaging」の詳細全文を読む スポンサード リンク
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