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The `<template/>` element `contents` property is a document fragment that may have a `null` `documentElement`. In Safari 16 this happens in more cases due to recent spec changes - in particular, even if that document fragment is explicitly adopted into an outer document. We're testing both of those cases now. The crash used to happen in `jQuery.contains` which is an alias for `Sizzle.contains` in jQuery 3.x. The Sizzle fix is at jquery/sizzle#490, released in Sizzle `2.3.8`. This version of Sizzle is included in the parent commit. A fix similar to the one from gh-5158 has also been applied here to the `selector-native` version. Fixes gh-5147 Closes gh-5159 Ref jquery/sizzle#490 Ref gh-5158