This is the Same Origin Policy, which all browsers implement.
这就是所有浏览器都实现了的同源策略（Same Origin Policy）。
Use of the tag to circumvent the Same Origin Policy allows the client to retrieve content from third parties.
使用 标记避开同源策略使客户机能检索来自第三方的内容。
Some of the solutions proposed include relaxing the same-origin policy in the browser coupled with adding additional controls.
一些提出的解决方案包括：在辅以额外控制的同时，放宽同源策略的限制。
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