jQuery 3.6.4 Released: Selector Forgiveness

If you’ve been following along with recent jQuery releases, we have been working on how to address the recent addition of some new selectors in browsers, especially :has. jQuery 3.6.3 settled on the strategy of using native CSS.supports to determined whether a selector should be passed directly to querySelectorAll or instead go through jQuery’s selector engine, as might be the case when using jQuery selector extensions, complex :not(), or other selectors that are valid in jQuery but not in the browser. That all technically worked fine, but came with a downside. Fortunately for us, the fix is no longer necessary and we can go back to the old way. More on that below.

As usual, the release is available on our cdn and the npm package manager. Other third party CDNs will probably have it soon as well, but remember that we don’t control their release schedules and they will need some time. Here are the highlights for jQuery 3.6.4.

The Difference Between What Is Right and What Is Allowed

Whenever you use a selector in CSS, or JS, there is more than one spec involved. There’s a spec to determine whether a selector is valid (i.e. Selectors) and there’s a spec to guide implementers in how a selector should be parsed (i.e. the parser algorithm for consuming a simple block). The parser implementation is more forgiving than the selector spec itself, to allow for things like attribute selectors missing the last ] character.

When we addressed an issue with some selectors that were being added to modern browsers—specifically :has—we started making use of another API available in most of our supported browsers—CSS.supports—to determine whether a selector could safely be passed to native querySelectorAll or whether it needed to go through jQuery’s selector engine. Selectors may need to bypass qSA for multiple reasons. It may be a jQuery-only selector extension (:contains), a standard selector that jQuery supports in a more robust way (:not(complex)), or a selector we know to be buggy sometimes (:enabled or :disabled). Whatever the reason, the introduction of “forgiving parsing” in selectors like :has made our previous way of determining that an issue because the browser would no longer throw errors for some truly invalid selectors. For instance, :has(:contains) no longer threw an error when passed to querySelectorAll. Neither did :has(:monkey) for that matter. CSS.supports seemed to be the answer.

And yet, every solution can have a trade-off. The problem now was that selectors that were technically invalid according to the Selectors spec were throwing errors. But these same selectors used to work fine because the parsers were more, for lack of a better term, forgiving. Essentially, CSS.supports is not as forgiving as the parser.

Meanwhile, in our discussions with spec writers and vendors, it was agreed that we needed to prevent issues similar to the one with :has from happening again in the future. What does that mean? It means we can go back to the old way . . . mostly. While the spec has been updated, browsers will need some time to update their implementations. And because of that, we still recommend upgrading jQuery to the latest version.


We do not expect compatibility issues when upgrading from a jQuery 3.0+ version. To upgrade, have a look at the new 3.5 Upgrade Guide. If you haven’t yet upgraded to jQuery 3+, first have a look at the 3.0 Upgrade Guide.

The jQuery Migrate plugin will help you to identify compatibility issues in your code. Please try out this new release and let us know about any issues you experienced.

If you can’t yet upgrade to 3.5+, Daniel Ruf has kindly provided patches for previous jQuery versions.


You can get the files from the jQuery CDN, or link to them directly:



You can also get this release from npm:

npm install [email protected]

Slim build

Sometimes you don’t need ajax, or you prefer to use one of the many standalone libraries that focus on ajax requests. And often it is simpler to use a combination of CSS and class manipulation for web animations. Along with the regular version of jQuery that includes the ajax and effects modules, we’ve released a “slim” version that excludes these modules. The size of jQuery is very rarely a load performance concern these days, but the slim build is about 6k gzipped bytes smaller than the regular version. These files are also available in the npm package and on the CDN:



These updates are already available as the current versions on npm and Bower. Information on all the ways to get jQuery is available at https://jquery.com/download/. Public CDNs receive their copies today, please give them a few days to post the files. If you’re anxious to get a quick start, use the files on our CDN until they have a chance to update.


Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including Michal Golebiowski-Owczarek and the whole jQuery team.

We’re on Mastodon!

jQuery now has its very own Mastodon account. We will be cross posting to both Twitter and Mastodon from now on. Also, you may be interested in following some of our team members that have Mastodon accounts.

jQuery: https://social.lfx.dev/@jquery

mgol: https://hachyderm.io/@mgol

timmywil: https://hachyderm.io/@timmywil


Full changelog: 3.6.4


Update Sizzle from 2.3.9 to 2.3.10 (#5194, dbe09e39)
Updating the 3.6-stable version to 3.6.4-pre. (a0d68b84)

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Sing App React and Light Blue React Admin templates Update

We are happy to announce an update of one of our first React Admin TemplatesSing App React and Light Blue React!

What react admins are affected by the update?

Current 5 React Admin boilerplates are affected by updates:

Sing App React
Sing App React Node.js
Sing App React Java
Light Blue React
Light Blue React Node.js

What has changed?

Now the admin boilerplates use React 17, and Bootstrap 5. Additionally, we have updated the colors, typography, and some minor UI parts.

And also we made several minor changes that make this admin dashboard template up-to-date.

Updated Amcharts to the latest version
Updated Fullcalendar to the latest version
Updated Axios
Updated Sortable library to the latest stable version
Updated Awesome Bootstrap checkbox that it now supports Bootstrap 5

Thus now, Sing App React and Light Blue React Admin Templates are one of the most modern react admin on the market in terms of technologies used under the hood and the look of the boilerplate.

Summing Up

For the rest of our React templates, check our marketplace. If you face any difficulties setting up this or that template or admin dashboard, please feel free to leave us a message on our forumTwitter or Facebook. We will respond to your inquiry as quickly as possible!

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How to Upgrade to the React 18 Release Candidate

Our next major version, React 18, is available today as a Release Candidate (RC). As we shared at React Conf, React 18 introduces features powered by our new concurrent renderer, with a gradual adoption strategy for existing applications. In this post, we will guide you through the steps for upgrading to React 18.

If you’d like to help us test React 18, follow the steps in this upgrade guide and report any issues you encounter so we can fix them before the stable release.

Note for React Native users: React 18 will ship in React Native with the New React Native Architecture. For more information, see the React Conf keynote here.


To install the latest React 18 RC, use the @rc tag:

Or if you’re using yarn:

Updates to Client Rendering APIs

When you first install React 18, you will see a warning in the console:

ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it’s running React 17. Learn more: https://reactjs.org/link/switch-to-createroot

React 18 introduces a new root API which provides better ergonomics for managing roots. The new root API also enables the new concurrent renderer, which allows you to opt-into concurrent features.

// Before
import { render } from ‘react-dom’;
const container = document.getElementById(‘app’);
render(<App tab=home />, container);

// After
import { createRoot } from ‘react-dom/client’;
const container = document.getElementById(‘app’);
const root = createRoot(container);
root.render(<App tab=home />);

We’ve also changed unmountComponentAtNode to root.unmount:

// Before

// After

We’ve also removed the callback from render, since it usually does not have the expected result when using Suspense:

// Before
const container = document.getElementById(‘app’);
ReactDOM.render(<App tab=home />, container, () => {

// After
function AppWithCallbackAfterRender() {
useEffect(() => {

return <App tab=home />

const container = document.getElementById(‘app’);
const root = ReactDOM.createRoot(container);
root.render(<AppWithCallbackAfterRender />);

Note: There is no one-to-one replacement for the old render callback API — it depends on your use case. See the working group post for Replacing render with createRoot for more information.

Finally, if your app uses server-side rendering with hydration, upgrade hydrate to hydrateRoot:

// Before
import { hydrate } from ‘react-dom’;
const container = document.getElementById(‘app’);
hydrate(<App tab=home />, container);

// After
import { hydrateRoot } from ‘react-dom/client’;
const container = document.getElementById(‘app’);
const root = hydrateRoot(container, <App tab=home />);
// Unlike with createRoot, you don’t need a separate root.render() call here.

For more information, see the working group discussion here.

Updates to Server Rendering APIs

In this release, we’re revamping our react-dom/server APIs to fully support Suspense on the server and Streaming SSR. As part of these changes, we’re deprecating the old Node streaming API, which does not support incremental Suspense streaming on the server.

Using this API will now warn:

renderToNodeStream: Deprecated ⛔️️

Instead, for streaming in Node environments, use:

renderToPipeableStream: New ✨

We’re also introducing a new API to support streaming SSR with Suspense for modern edge runtime environments, such as Deno and Cloudflare workers:

renderToReadableStream: New ✨

The following APIs will continue working, but with limited support for Suspense:

renderToString: Limited ⚠️

renderToStaticMarkup: Limited ⚠️

Finally, this API will continue to work for rendering e-mails:


For more information on the changes to server rendering APIs, see the working group post on Upgrading to React 18 on the server, a deep dive on the new Suspense SSR Architecture, and Shaundai Person’s talk on Streaming Server Rendering with Suspense at React Conf 2021.

Automatic Batching

React 18 adds out-of-the-box performance improvements by doing more batching by default. Batching is when React groups multiple state updates into a single re-render for better performance. Before React 18, we only batched updates inside React event handlers. Updates inside of promises, setTimeout, native event handlers, or any other event were not batched in React by default:

// Before React 18 only React events were batched

function handleClick() {
setCount(c => c + 1);
setFlag(f => !f);
// React will only re-render once at the end (that’s batching!)

setTimeout(() => {
setCount(c => c + 1);
setFlag(f => !f);
// React will render twice, once for each state update (no batching)
}, 1000);

Starting in React 18 with createRoot, all updates will be automatically batched, no matter where they originate from. This means that updates inside of timeouts, promises, native event handlers or any other event will batch the same way as updates inside of React events:

// After React 18 updates inside of timeouts, promises,
// native event handlers or any other event are batched.

function handleClick() {
setCount(c => c + 1);
setFlag(f => !f);
// React will only re-render once at the end (that’s batching!)

setTimeout(() => {
setCount(c => c + 1);
setFlag(f => !f);
// React will only re-render once at the end (that’s batching!)
}, 1000);

This is a breaking change, but we expect this to result in less work rendering, and therefore better performance in your applications. To opt-out of automatic batching, you can use flushSync:

import { flushSync } from ‘react-dom’;

function handleClick() {
flushSync(() => {
setCounter(c => c + 1);
// React has updated the DOM by now
flushSync(() => {
setFlag(f => !f);
// React has updated the DOM by now

For more information, see the Automatic batching deep dive.

New APIs for Libraries

In the React 18 Working Group we worked with library maintainers to create new APIs needed to support concurrent rendering for use cases specific to their use case in areas like styles, external stores, and accessibility. To support React 18, some libraries may need to switch to one of the following APIs:

useId is a new hook for generating unique IDs on both the client and server, while avoiding hydration mismatches. This solves an issue that already exists in React 17 and below, but it’s even more important in React 18 because of how our streaming server renderer delivers HTML out-of-order. For more information see the useId post in the working group.

useSyncExternalStore is a new hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. This new API is recommended for any library that integrates with state external to React. For more information, see the useSyncExternalStore overview post and useSyncExternalStore API details.

useInsertionEffect is a new hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this. This hook will run after the DOM is mutated, but before layout effects read the new layout. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. For more information, see the Library Upgrade Guide for <style>.

React 18 also introduces new APIs for concurrent rendering such as startTransition and useDeferredValue, which we will share more about in the upcoming stable release post.

Updates to Strict Mode

In the future, we’d like to add a feature that allows React to add and remove sections of the UI while preserving state. For example, when a user tabs away from a screen and back, React should be able to immediately show the previous screen. To do this, React would unmount and remount trees using the same component state as before.

This feature will give React better performance out-of-the-box, but requires components to be resilient to effects being mounted and destroyed multiple times. Most effects will work without any changes, but some effects assume they are only mounted or destroyed once.

To help surface these issues, React 18 introduces a new development-only check to Strict Mode. This new check will automatically unmount and remount every component, whenever a component mounts for the first time, restoring the previous state on the second mount.

Before this change, React would mount the component and create the effects:

* React mounts the component.
* Layout effects are created.
* Effect effects are created.

With Strict Mode in React 18, React will simulate unmounting and remounting the component in development mode:

* React mounts the component.
* Layout effects are created.
* Effect effects are created.
* React simulates unmounting the component.
* Layout effects are destroyed.
* Effects are destroyed.
* React simulates mounting the component with the previous state.
* Layout effect setup code runs
* Effect setup code runs

For more information, see the Working Group posts for Adding Strict Effects to Strict Mode and How to Support Strict Effects.

Configuring Your Testing Environment

When you first update your tests to use createRoot, you may see this warning in your test console:

The current testing environment is not configured to support act(…)

To fix this, set global.IS_REACT_ACT_ENVIRONMENT to true before running your test:

// In your test setup file

The purpose of the flag is to tell React that it’s running in a unit test-like environment. React will log helpful warnings if you forget to wrap an update with act.

You can also set the flag to false to tell React that act isn’t needed. This can be useful for end-to-end tests that simulate a full browser environment.

Eventually, we expect testing libraries will configure this for you automatically. For example, the next version of React Testing Library has built-in support for React 18 without any additional configuration.

More background on the the act testing API and related changes is available in the working group.

Dropping Support for Internet Explorer

In this release, React is dropping support for Internet Explorer, which is going out of support on June 15, 2022. We’re making this change now because new features introduced in React 18 are built using modern browser features such as microtasks which cannot be adequately polyfilled in IE.

If you need to support Internet Explorer we recommend you stay with React 17.

Other Changes

Update to remove the “setState on unmounted component” warning
Suspense no longer requires a fallback prop to capture
Components can now render undefined
Deprecated renderSubtreeIntoContainer
StrictMode updated to not silence double logging by defaultFlatlogic Admin Templates banner

.NET 7 Preview 1 Has Been Released

This past week, NET 7 Preview 1 was released! By extension, this also means that Entity Framework 7 and ASP.NET Core 7 preview versions shipped at the same time.

So what’s new? In all honesty not a heck of a lot that will blow your mind! As with most Preview 1 releases, it’s mostly about getting that first version bump out of the way and any major blockers from the previous release sorted. So with that in mind, skimming the release notes I can see :

Progress continues on MAUI (The multi platform UI components for .NET), but we are still not at an RC (Although RC should be shipping with .NET 7)
Entity Framework changes are almost entirely bugs from the previous release
There is a slight push (And I’ve also seen this on Twitter), to merge in concepts from Orleans, or more broadly, having .NET 7 focus on quality of life improvements that lend itself to microservices or independent distributed applications (Expect to hear more about this as we get closer to .NET 7 release)
Further support for nullable reference types in various .NET libraries
Further support for file uploads and streams when building API’s using the Minimal API framework
Support for nullable reference types in MVC Views/Razor Pages
Performance improvements for header parsing in web applications

So nothing too ground breaking here. Importantly .NET 7 is labelled as a “Current” release which means it only receives 18 months of support. This is normal as Microsoft tend to alternate releases between Life Time Support and Current.

You can download .NET 7 Preview 1 here : https://dotnet.microsoft.com/en-us/download/dotnet/7.0

And you will require Visual Studio 2022 *Preview*!

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.NET December 2021 Updates – 6.0.1, 5.0.13 and 3.1.22

Today, we are releasing the .NET December 2021 Updates. These updates contain reliability and security improvements. See the individual release notes for details on updated packages.

You can download 6.0.1, 5.0.13 and 3.1.22 versions for Windows, macOS, and Linux, for x86, x64, Arm32, and Arm64.

Installers and binaries: 6.0.1 | 5.0.13 | 3.1.22

Release notes: 6.0.1 | 5.0.13 | 3.1.22

Container images
Linux packages: 6.0.1 | 5.0.13 | 3.1.22

Release feedback/issue
Known issues: 6.0 | 5.0 | 3.1


ASP.NET Core: 6.0.1 | 5.0.13 | 3.1.22

EF Core: 6.0.1

Runtime: 6.0.1 | 5.0.13

Winforms: 6.0.1 | 5.0.13


CVE-2021-43877: ASP.NET Core Information Disclosure Vulnerability

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET and .NET Core. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

An elevation of privilege vulnerability exists in ASP.NET Core Module (ANCM) that could allow elevation of privilege when .NET Core, .NET 5 and .NET 6 applications are hosted within IIS.

Deployment Update

Customers that have opted to receive .NET Core updates via the Microsoft Update channel will be offered updates to the Hosting Bundle starting with the December 2021 update. Updates for other .NET Core bundles (.NET Core Runtime, ASP.NET Core Runtime, Windows Desktop Runtime, and SDK) have been offered via Microsoft Update to customers that opt in since December 2020. See this blog post for more information.

Visual Studio

See release notes for Visual Studio compatibility for .NET 6.0, .NET 5.0, and .NET Core 3.1.

The post .NET December 2021 Updates – 6.0.1, 5.0.13 and 3.1.22 appeared first on .NET Blog.

.NET 6 / C# 10 Top New Features Recap

Over the past few months, I’ve been publishing posts around new features inside .NET 6 and C# 10. I put those as two separate feature lanes but in reality, they somewhat blur together now as a new release of .NET generally means a new release of C#. And features built inside .NET, are typically built on the back of new C# 10 features.

That being said, I thought it might be worthwhile doing a recap of the features I’m most excited about. This is not an exhaustive list of every single feature we should expect come release time in November, but instead, a nice little retrospective on what’s coming, and what it means going forward as a C#/.NET Developer.

Minimal API Framework

The new Minimal API framework is in full swing, and allows you to build an API without the huge ceremony of startup files. If you liked the approach in NodeJS of “open the main.js file and go”, then you’ll like the new Minimal API framework. I highly suggest that everyone take a look at this feature because I suspect it’s going to become very very popular given the modern day love for microservices architectures.


DateOnly and TimeOnly Types

This is a biggie in my opinion. The ability to now specify types as being *only* a date or *only* a time is huge. No more rinky dink coding around using a DateTime with no time portion for example.


LINQ OrDefault Enhancements

Not as great as it sounds on the tin, but being able to specify what exactly the “OrDefault” will return as a default can be handy in some cases. S


Implicit Using Statements

Different project types can now implicitly import using statements globally so you don’t have to. e.g. No more writing “using System;” at the top of every single file. However, this particular feature has slightly been walked back to not be turned on by default. Still interesting none the less.


IEnumerable Chunk

Much handier than it sounds at first glance. More sugar than anything, but the ability for the framework to handle “chunking” a collection for you will see a lot of use in the future.


SOCKS Proxy Support

Somewhat surprisingly, .NET has never supported SOCKS proxies until now. I can’t say I’ve ever run into this issue myself, but I could definitely see this being a right pain when you are half way down a project build and realize that you can’t use SOCKS. But it’s here now atleast!


Priority Queue

Another feature that is surprising it’s never been here till now. The ability to have a priority on queue items will be a huge help to many. This is likely to see a whole heap of use in the coming years.



How have we lived without this until now? The ability to find the “max” of a property on a complex object, but then return the complete object. Replaces the cost of doing a full order by then picking the first item. Very handy!


Global Using Statements

The feature that makes Implicit Using Statements possible. Essentially the ability to declare a using statement once in your project, and not have to clutter the top of every single file importing the exact same things over and over again. Will see use from day 1.


File Scoped Namespaces

More eye candy than anything. Being able to declare a namespace without braces services to save you one tab to the right.


What’s Got You Excited?

For me, I’m super pumped about the minimal API framework. The low ceremony is just awesome for quick API’s that need be shipped yesterday. Besides that, I think the DateOnly and TimeOnly will see a tonne of use from Day 1, and I imagine that new .NET developers won’t even think twice that we went 20 odd years with only DateTime.

How about you? What are you excited about?

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