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並前往https://w3c-test.org/html/semantics/embedded-content/the-iframe-element/document-getters-return-null-for-cross-origin.html

return null for a cross-origin document.

Result, Test Name, Message. Pass, HTMLIFrameElement.contentDocument for cross-origin document, Asserts run. Pass, assert_equals(null, null) at Test.

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查詢 「contentDocument null」的人也找了：

  1. contentDocument
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  2. contentDocument null
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  3. Iframe contentDocument
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  4. Cannot read property 'contentwindow' of null
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  5. contentWindow contentDocument
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  6. Iframe contentWindow
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  7. Object contentDocument null
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  8. contentdocument body null
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