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Selector: Only attach the unload handler in IE & Edge Legacy - #5282
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Both IE & Edge Legacy need the workaround of calling `setDocument()` in an `unload` handler to avoid "permission denied" errors. However, due to not being possible to feature-detect this issue, the handler has been applied in all browsers for windows different than the one in which jQuery was loaded. jQuery 4.0, which drops Edge Legacy support, guards this workaround with a `document.documentMode` check. This won't work in the 3.x line due to still supporting Edge Legacy but we can check for `document.documentElement.msMatchesSelector` instead as that API is supported in IE 9+ and all Edge Legacy versions. Fixes jquerygh-5281 Ref jquerygh-4792
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timmywil
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Jul 10, 2023
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Summary
Both IE & Edge Legacy need the workaround of calling
setDocument()in anunloadhandler to avoid "permission denied" errors. However, due to not being possible to feature-detect this issue, the handler has been applied in all browsers for windows different than the one in which jQuery was loaded.jQuery 4.0, which drops Edge Legacy support, guards this workaround with a
document.documentModecheck. This won't work in the 3.x line due to still supporting Edge Legacy but we can check fordocument.documentElement.msMatchesSelectorinstead as that API is supported in IE 9+ and all Edge Legacy versions.Fixes gh-5281
Ref gh-4792
+6 bytes
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If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com