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Commit87467a6

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Selector: Only attach the unload handler in IE & Edge Legacy
Both IE & Edge Legacy need the workaround of calling `setDocument()` in an`unload` handler to avoid "permission denied" errors. However, due to not beingpossible to feature-detect this issue, the handler has been applied in allbrowsers for windows different than the one in which jQuery was loaded.jQuery 4.0, which drops Edge Legacy support, guards this workaround witha `document.documentMode` check. This won't work in the 3.x line due to stillsupporting Edge Legacy but we can check for`document.documentElement.msMatchesSelector` instead as that API issupported in IE 9+ and all Edge Legacy versions.Fixesgh-5281Closesgh-5282Refgh-4792
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‎src/selector.js

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Original file line numberDiff line numberDiff line change
@@ -523,12 +523,17 @@ function setDocument( node ) {
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documentElement.msMatchesSelector;
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// Support: IE 9 - 11+, Edge 12 - 18+
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// Accessing iframe documents after unload throws "permission denied" errors (see trac-13936)
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// Support: IE 11+, Edge 17 - 18+
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// IE/Edge sometimes throw a "Permission denied" error when strict-comparing
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// two documents; shallow comparisons work.
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// eslint-disable-next-line eqeqeq
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if(preferredDoc!=document&&
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// Accessing iframe documents after unload throws "permission denied" errors
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// (see trac-13936).
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// Limit the fix to IE & Edge Legacy; despite Edge 15+ implementing `matches`,
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// all IE 9+ and Edge Legacy versions implement `msMatchesSelector` as well.
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if(documentElement.msMatchesSelector&&
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// Support: IE 11+, Edge 17 - 18+
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// IE/Edge sometimes throw a "Permission denied" error when strict-comparing
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// two documents; shallow comparisons work.
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// eslint-disable-next-line eqeqeq
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preferredDoc!=document&&
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(subWindow=document.defaultView)&&subWindow.top!==subWindow){
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// Support: IE 9 - 11+, Edge 12 - 18+

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