Last February, we released the first beta of jQuery 4.0.0. We’re now ready to release a second, and we expect a release candidate to come soon™. This release comes with a major rewrite to jQuery’s testing infrastructure, which removed all deprecated or under-supported dependencies. But the main change that warranted a second beta was a fix to the exports field for bundlers. More on that and other changes below.

Many of the breaking changes in jQuery 4.0.0 are ones the team has wanted to make for years, but couldn’t in a patch or minor release. We’ve trimmed legacy code (including removing support for IE before version 11), removed some previously-deprecated APIs, removed some internal-only parameters to public functions that were never documented, and dropped support for some “magic” behaviors that were overly complicated.

We will publish a comprehensive upgrade guide before final release, to outline the removed code and how to migrate. The jQuery Migrate plugin will also be ready to assist. For now, please try out this release and let us know if you encounter any issues.

As usual, the release is available on our CDN and the npm package manager. Third party CDNs will not be hosting this beta release, but will host the 4.0.0 final release later. Here are some highlights for jQuery 4.0.0 beta.2.

CommonJS + ESM: Strange Bedfellows

There are many different ways to include jQuery in a project. Supporting all of them can be difficult, especially when the environment supports both CommonJS and ESM modules. We wanted to support all of the ways jQuery might be included, whether using a named export or the default export. Also, we wanted to ensure jQuery was only ever included once, even when jQuery was both imported using ESM and required using CommonJS in the same environment or bundle. We think we’ve worked out a solution that supports Node.js and bundlers like rollup, webpack, and parcel. More details can be found in the PR. Also, we created a wiki page to explain how the exports property in jQuery’s package.json will work in 4.0.

Boolean Attributes: To Be Or …

The HTML spec defines boolean attributes that often correlate with boolean properties. If the attribute is missing, it correlates with the false property value, if it’s present – the true property value. The only valid values for boolean content attributes are empty string or the full attribute name (e.g. checked="checked").

jQuery has historically tried to be helpful here and treated boolean attributes in a special way in the .attr() API:

1. For the getter, as long as the attribute was present, it was returning the
   attribute name lowercased, ignoring the value.
2. For the setter, it was removing the attribute when false was passed;
   otherwise, it was ignoring the passed value and set the attribute –
   interestingly, in jQuery >=3 not lowercased anymore.

The problem is the spec occasionally converts boolean attributes into ones with additional attribute values with special behavior – one such example is the new "until-found" value for the hidden attribute. Our setter normalization meant passing those values was impossible with .attr() (.prop() was unaffected). Also, new boolean attributes were introduced occasionally and jQuery could not easily add them to the list without incurring breaking changes.

This patch removes any special handling of boolean attributes – the getter returns the value as-is and the setter sets the provided value, with one exception. To maintain backwards compatibility, this patch makes the false boolean value trigger attribute removal for ALL non-ARIA attributes. For example, .attr( "checked", false ) will continue to remove the checked attribute, which is the only way the corresponding property will be set to false. ARIA attributes are exempt from the rule since many of them recognize the string "false" as a valid value with semantics different than the attribute missing. To remove an ARIA attribute, use .removeAttr() or pass null as the value to .attr().

Position of Elements In Tables

jQuery 4.0.0-beta.2 also fixes some inconsistent behavior when finding the position of elements within tables. The offset parent on which the position was based could change depending on whether the element’s position style was static or relative.

<div id="container" style="position: relative;">
    <table>
        <tr>
            <td>
                <span id="static"></span>
                <span id="relative" style="position: relative;"></span>
            </td>
        </tr>
    </table>
</div>

Previously, $('#static').position() was returning the position relative to the containing <td> element, while $('#relative').position() was returning the position relative to #container.

Now, both elements return their position relative to #container.

Download

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

https://code.jquery.com/jquery-4.0.0-beta.2.js

https://code.jquery.com/jquery-4.0.0-beta.2.min.js

You can also get this release from npm:

npm install jquery@4.0.0-beta.2

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. Finally, all of jQuery’s supported browsers (except for IE11) now have support for native Promises across the board, so Deferreds and Callbacks are no longer needed in most cases. Along with the regular version of jQuery that includes everything, 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 8k gzipped bytes smaller than the regular version. These files are also available in the npm package and on the CDN:

https://code.jquery.com/jquery-4.0.0-beta.2.slim.js

https://code.jquery.com/jquery-4.0.0-beta.2.slim.min.js

These updates are already available as the current versions on npm. 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.

Thanks

Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including Michał Gołębiowski-Owczarek, J.Son, Liam James and the whole jQuery team.

We’re on Mastodon!

jQuery has a Mastodon account! We now post releases and other updates to both X and Mastodon. Also, you may be interested in following some of our team members that have Mastodon accounts.

Changelog

Full changelog: 4.0.0-beta.2

jQuery 4.0.0 has been in the works for a long time, but it is now ready for a beta release! There’s a lot to cover, and the team is excited to see it released. We’ve got bug fixes, performance improvements, and some breaking changes. We removed support for IE<11 after all! Still, we expect disruption to be minimal.

Many of the breaking changes are ones the team has wanted to make for years, but couldn’t in a patch or minor release. We’ve trimmed legacy code, removed some previously-deprecated APIs, removed some internal-only parameters to public functions that were never documented, and dropped support for some “magic” behaviors that were overly complicated.

We will publish a comprehensive upgrade guide before final release, to outline the removed code and how to migrate. The jQuery Migrate plugin will also be ready to assist. For now, please try out the beta release and let us know if you encounter any issues.

As usual, the release is available on our CDN and the npm package manager. Third party CDNs will not be hosting this beta release, but will host the 4.0.0 final release later. Here are some highlights for jQuery 4.0.0 beta.

Goodbye IE<11

jQuery 4.0 drops support for IE 10 and older. Some may be asking why we didn’t remove support for IE 11. We plan to remove support in stages, and the next step will be released in jQuery 5.0. For now, we’ll start by removing code specifically supporting IE versions older than 11, giving us a size reduction of 867 gzipped bytes in one PR!

We also dropped support for other very old browsers, including Edge Legacy, iOS <11, Firefox <65, and Android Browser. No changes should be required on your end. If you need to support any of these browsers, simply stick with jQuery 3.x.

Deprecated APIs removed

These functions have been deprecated for several versions. It’s time to remove them now that we’ve reached a major release. These functions were either always meant to be internal or ones that now have native equivalents in all supported browsers. The removed functions are:

• jQuery.cssNumber
• jQuery.cssProps
• jQuery.isArray
• jQuery.parseJSON
• jQuery.nodeName
• jQuery.isFunction
• jQuery.isWindow
• jQuery.camelCase
• jQuery.type
• jQuery.now
• jQuery.isNumeric
• jQuery.trim
• jQuery.fx.interval

push, sort, and splice removed

The jQuery prototype has long had Array methods that did not behave like any other jQuery methods and were always meant for internal-use only. These methods are push, sort, and splice. We switched our uses of these methods to Array functions instead of the jQuery prototype. For example, $elems.push( elem ) became [].push.call( $elems, elem ). We’re mentioning it here in case there are any plugins out there that may have relied on these methods.

Updated slim build

The slim build has gotten even smaller in jQuery 4.0.0 with the removal of Deferreds and Callbacks (now below 20k bytes gzipped!). Deferreds have long-supported the Promises A+ standard, so native Promises can be used instead in most cases and they are available in all of jQuery’s supported browsers except IE11. Deferreds do have some extra features that native Promises do not support, but most usage can be migrated to Promise methods. If you need to support IE11, it’s best to use the main build or add a polyfill for native Promises.

Download

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

https://code.jquery.com/jquery-4.0.0-beta.js

https://code.jquery.com/jquery-4.0.0-beta.min.js

You can also get this release from npm:

npm install jquery@4.0.0-beta

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. Finally, all of jQuery’s supported browsers (except for IE11) now have support for native Promises across the board, so Deferreds and Callbacks are no longer needed in most cases. Along with the regular version of jQuery that includes everything, 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 8k gzipped bytes smaller than the regular version. These files are also available in the npm package and on the CDN:

https://code.jquery.com/jquery-4.0.0-beta.slim.js

https://code.jquery.com/jquery-4.0.0-beta.slim.min.js

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.

Thanks

Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including Alex, Ahmed S. El-Afifi, fecore1, Dallas Fraser, Richard Gibson, Michał Gołębiowski-Owczarek, Pierre Grimaud, Gabriela Gutierrez, Jonathan, Necmettin Karakaya, Anders Kaseorg, Wonseop Kim, Simon Legner, Shashanka Nataraj, Pat O’Callaghan, Christian Oliff, Dimitri Papadopoulos Orfanos, Wonhyoung Park, Bruno PIERRE, Baoshuo Ren, Beatriz Rezener, Sean Robinson, Ed Sanders, Timo Tijhof, Tom, Christian Wenz, ygj6 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.

Changelog

Full changelog: 4.0.0-beta

jQuery 3.7.1 has been released! This release fixes a regression from jQuery 3.6.0 that resulted in rounded dimensions for <tr /> elements in Chrome and Safari. Also, a (mostly) internal Sizzle method, jQuery.find.tokenize that was on the jQuery object was accidentally removed when we removed Sizzle in jQuery 3.7.0. That method has been restored.

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 3.7.1.

Support Test for Table Rows

jQuery 3.6.0 introduced a change to a support test to account for a sudden failure from Firefox, which started including table borders in computed dimensions for <tr /> elements. That may be actually be correct, but Firefox is the only browser doing it. However, that new support test didn’t account for pages with * { box-sizing: border-box; } in CSS. And so, the support test failed on those pages in all browsers. The result was a fallback to use outerWidth and outerHeight, which unfortunately doesn’t return fractional values. The support test has now been fixed and previous behavior has been restored for Chrome and Safari, but Firefox and IE will continue to return integers.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.7.1.js

https://code.jquery.com/jquery-3.7.1.min.js

You can also get this release from npm:

npm install jquery@3.7.1

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:

https://code.jquery.com/jquery-3.7.1.slim.js

https://code.jquery.com/jquery-3.7.1.slim.min.js

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.

Thanks

Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including Gabriela Gutierrez, Michal Golebiowski-Owczarek, Timo Tijhof, Dimitri Papadopoulos Orfanos 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.

Changelog

Full changelog: 3.7.1

jQuery 3.7.0 is now available! This release has it all: bug fixes, a new method, and a performance improvement! We even dropped our longtime selector engine: Sizzle. Or, I should say, we moved it into jQuery. jQuery no longer depends on Sizzle as a separate project, but has instead dropped its code directly into jQuery core. This helps us prepare for the major changes coming to selection in future jQuery versions. That doesn’t mean much right now, but jQuery did drop a few bytes because Sizzle supports even older browsers than jQuery. As an aside, we do plan on archiving Sizzle, but we’ll have more details on that in a future blog post.

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 3.7.0.

New method: .uniqueSort()

Some APIs, like .prevAll(), return elements in reverse order, which can result in some confusing behavior when used with wrapping methods. For example,

$elem.prevAll().wrapAll("<p/>")

The above would wrap all of the elements as expected, but it would write those elements to the DOM in reverse order. To solve this in a way that prevented breaking existing code, we’ve documented that .prevAll() and similar methods return reverse-order collections, which is still desirable in many cases. But we’ve also added a new method to make things easier: a chainable .uniqueSort(), which does the equivalent of the existing but static jQuery.uniqueSort().

So, our previous example would become:

$elem.prevAll().uniqueSort().wrapAll("<p/>")

and the element order in the DOM would remain the same.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.7.0.js

https://code.jquery.com/jquery-3.7.0.min.js

You can also get this release from npm:

npm install jquery@3.7.0

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:

https://code.jquery.com/jquery-3.7.0.slim.js

https://code.jquery.com/jquery-3.7.0.slim.min.js

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.

Thanks

Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including fecore1, 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.

Changelog

Full changelog: 3.7.0

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.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.6.4.js

https://code.jquery.com/jquery-3.6.4.min.js

You can also get this release from npm:

npm install jquery@3.6.4

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:

https://code.jquery.com/jquery-3.6.4.slim.js

https://code.jquery.com/jquery-3.6.4.slim.min.js

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.

Thanks

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.

Changelog

Full changelog: 3.6.4

Last week, we released jQuery 3.6.2. There were several changes in that release, but the most important one addressed an issue with some new selectors introduced in most browsers, like :has(). We wanted to release jQuery 3.6.3 quickly because an issue was reported that revealed a problem with our original fix. More details 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 3.6.3.

Using CSS.supports the right way

After the issue with :has that was fixed in jQuery 3.6.2, we started using CSS.supports( "selector(SELECTOR)") to determine whether a selector would be valid if passed directly to querySelectorAll. When CSS.supports returned false, jQuery would then fall back to its own selector engine (Sizzle). Apparently, our implementation had a bug. In CSS.supports( "selector(SELECTOR)"), SELECTOR needed to be a <complex-selector> and not a <complex-selector-list>. For example:

CSS.supports("selector(div)"); // true
CSS.supports("selector(div, span)"); // false

This meant that all complex selector lists were passed through Sizzle instead of querySelectorAll. That’s not necessarily a problem in most cases, but it does mean that some level 4 selectors that were supported in browsers but not in Sizzle, like :valid, no longer worked if it was part of a selector list (e.g. "input:valid, div"). It should be noted this currently only affects Firefox, but it will be true in all browsers as they roll out changes to CSS.supports.

This has now been fixed in jQuery 3.6.3 and it is the only functional change in this release.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.6.3.js

https://code.jquery.com/jquery-3.6.3.min.js

You can also get this release from npm:

npm install jquery@3.6.3

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:

https://code.jquery.com/jquery-3.6.3.slim.js

https://code.jquery.com/jquery-3.6.3.slim.min.js

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.

Thanks

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.

Changelog

Full changelog: 3.6.3

You probably weren’t expecting another release so soon, but jQuery 3.6.2 has arrived! The main impetus for this release was the introduction of some new selectors in Chrome. 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 3.6.2.

undefined and whitespace-only CSS variables

jQuery 3.6.1 introduced a minor regression where attempting to retrieve a value for a custom CSS property that didn’t exist (i.e. $elem.css("--custom")) threw an error instead of returning undefined. This has been fixed in 3.6.2. Related to that, we also made sure that whitespace-only values return the same thing across all browsers. The spec requires that CSS variable values be trimmed, but browsers are inconsistent in their trimming. We now return undefined for whitespace-only values to make it consistent with older jQuery and across the different browsers.

.contains() with <template>

An issue was recently reported that showed that a <template>‘s document had its documentElement property set to null, in compliance with the spec. While it made sense semantically for a template to not yet be tied to a document, it made for an unusual case, specifically in jQuery.contains() and any methods relying on it. That included manipulation and selector methods. Fortunately, the fix was simple.

It wasn’t Ralph that broke the internet

The internet experienced a bit of a rumble when Chrome recently introduced some new selectors, the most pertinent of which being :has(). It was a welcome addition, and one celebrated by the jQuery team, but a change to the spec meant that :has() used what’s called “forgiving parsing”. Essentially, even if the arguments for :has() were invalid, the browser returned no results instead of throwing an error. That was problematic in cases where :has() contained another jQuery selector extension (e.g. :has(:contains("Item"))) or contained itself (:has(div:has(a))). Sizzle relied on errors like that to know when to trust native querySelectorAll and when to run the selector through Sizzle. Selectors that used to work were broken in all jQuery versions dating back to the earliest jQuery versions.

And yet, this little drama didn’t last long. The Chrome team quickly implemented a workaround to fix previous jQuery versions in the vast majority of cases. Safari handled their implementation of :has() a little differently and didn’t have the same problem. But, there’s still an important issue open to determine how to address this in the CSS spec itself. The CSSWG has since resolved the issue.

jQuery has taken steps to ensure that any forgiving parsing doesn’t break future jQuery versions, even if previous jQuery versions would still be affected.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.6.2.js

https://code.jquery.com/jquery-3.6.2.min.js

You can also get this release from npm:

npm install jquery@3.6.2

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:

https://code.jquery.com/jquery-3.6.2.slim.js

https://code.jquery.com/jquery-3.6.2.slim.min.js

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.

Thanks

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

Changelog

Full changelog: 3.6.2

jQuery 3.6.1 has been released! It’s been a while since our previous release. We were looking at fixing some elusive edge cases related to focus and blur, but we never quite got the fix right. If there’s any area of jQuery that’s hard to change, it’s likely related to focus somehow. We’re leaving those as-is for now and will address them in the future, especially since the changes may end up warranting a major version release. See gh-4856 and gh-4950 for more details.

That said, this release still comes with some important fixes, detailed 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 3.6.1:

Infrastructure Improvements

We’ve done a lot of work in this release to update some of our testing and build infrastructure, including migrating CI from Travis CI to GitHub Actions, testing on Node 16 instead of Node 15, loading our testing listener over https, and adding more accurate testing for custom builds. We also removed some old links from comments in some files in the repo. These links were to URLs that have since been compromised. While these files were never distributed in a release, they still existed in the GitHub source and have been removed.

Not losing focus

There’s still one fix related to focus in this release. Our special event handling for focus remained attached even after jQuery focus handlers were removed, which broke any subsequent manual focus triggers. For example,

$elem
  .on("focus", function() {})
  .off("focus")
  .trigger("focus");

would not trigger focus.

Skipping falsey in addClass( array )

Without any size increase, we added support for skipping over any falsey values in an array passed to addClass or removeClass.

This makes code like:

elem.addClass( [ "a", "", "b" ] );

add both the a & b classes.

Aligning with the spec for custom CSS property values

A change to the CSS spec requires that custom properties be trimmed. Whitespace is now trimmed for custom CSS property values. Before, something like --prop: value ; would retain the leading and trailing spaces in the value, returning ” value “.

Appending scripts with HTML comments

An issue was discovered with our regex that strips HTML comments from scripts when they are appended, which ended up removing parts of the executable script in certain edge cases. Fortunately, our fix was to rely more on the browsers, but we still need to strip CDATA sections for IE in the 3.x branch. That will be removed in 4.0.

A performance boost for jQuery.trim

While jQuery.trim has already been removed on the main branch in favor of native String#trim in preparation for the next major release, it’s still needed on the 3.x branch for some browsers that branch supports, such as Android 4.0. There were certain edge cases that were incredibly slow due to the structure of our regex. That has since been changed and the speed-up is significant.

Upgrading

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.

Download

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

https://code.jquery.com/jquery-3.6.1.js

https://code.jquery.com/jquery-3.6.1.min.js

You can also get this release from npm:

npm install jquery@3.6.1

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:

https://code.jquery.com/jquery-3.6.1.slim.js

https://code.jquery.com/jquery-3.6.1.slim.min.js

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.

Thanks

Thank you to all of you who participated in this release by submitting patches, reporting bugs, or testing, including fecore1, Richard Gibson, Simon Legner, Michal Golebiowski-Owczarek, Vladimir Sitnikov, Timo Tijhof, Christian Oliff, ygj6, and the whole jQuery team.

Changelog

Full changelog: 3.6.1