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Selector: Use Sizzle
:has
if CSS.supports(selector(...))
non-comp…
…liant Sizzle has followed the following logic for selector handling for ages: 1. Modify the selector to adhere to scoping rules jQuery mandates. 2. Try `qSA` on the modified selector. If it succeeds, use the results. 3. If `qSA` threw an error, run the Sizzle custom traversal instead. It worked fine so far but now CSS has a concept of forgiving selector lists that some selectors like `:is()` & `:has()` use. That means providing unrecognized selectors as parameters to `:is()` & `:has()` no longer throws an error, it will just return no results. That made browsers with native `:has()` support break selectors using jQuery extensions inside, e.g. `:has(:contains("Item"))`. Detecting support for selectors can also be done via: ```js CSS.supports( "selector(SELECTOR_TO_BE_TESTED)" ) ``` which returns a boolean. There was a recent spec change requiring this API to always use non-forgiving parsing: w3c/csswg-drafts#7280 (comment) However, no browsers have implemented this change so far. To solve this, two changes are being made: 1. In browsers supports the new spec change to `CSS.supports( "selector()" )`, use it before trying `qSA`. 2. Otherwise, add `:has` to the buggy selectors list. Fixes jquery/jquery#5098 Closes gh-486 Ref jquery/jquery#5107 Ref w3c/csswg-drafts#7676
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