Michał Gołębiowski-Owczarek

css: Document no auto-appending `px` in jQuery 4.0

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Also, document the removal of `jQuery.cssNumber` in jQuery 4.0. `jQuery.cssNumber` is a weird API as it was never deprecated since jQuery `3.x` uses it but jQuery `4.0.0` will not need...

See https://github.com/jquery/jquery/pull/4603

jQuery 3.0.0 stopped auto-executing cross-domain scripts unless an explicit `dataType: "script"` was provided. jQuery 4.0.0 will extend this requirement to same-domain scripts as well. This needs to be documented.

Restore & warn against: * boolean attributes set to something different than their lowercase names * boolean attributes queried when set to something different than their lowercase names * non-boolean...

Migrate 3.x still contains some patches for breaking changes in jQuery 1.9; it should only handle breaking changes in 3.0 or later. In Migrate 3.x, we'll leave it as-is, as...

~~NOTE: Wait for https://github.com/jquery/jquery/pull/5564 to land before merging this PR.~~ Migrate the jQuery Core CONTRIBUTING.md, applying Migrate-specific changes. Fixes gh-486 Fixes gh-492 Ref jquery/jquery#5564

Also: 1. Create the selector module in Migrate. 2. Migrate some selector patches from `core` to `selector`. Fixes gh-544

Warn against legacy selector pseudos, backfill the API

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Ref https://github.com/jquery/jquery/pull/5137

Since 4.0, `.data()` no longer inherits from Object.prototype; the same applies to the `events` object from the private data store. We should not restore the old behavior as that will...