Category Archives: jQuery

jQuery 3.6.4 Released: Selector Forgiveness

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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.

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

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

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

Changelog

Full changelog: 3.6.4

Build

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

jQuery 3.6.3 Released: A Quick Selector Fix

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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

Build

  • remove stale Insight package from custom builds (81d5bd17)
  • Updating the 3.x-stable version to 3.6.3-pre. (2c5b47c4)

Selector

jQuery 3.6.2 Released!

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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

CSS

  • Return undefined for whitespace-only CSS variable values (#5120) (8bea1dec)
  • Don’t trim whitespace of undefined custom property (#5105, c0db6d70)

Selector

Tests

  • Remove a workaround for a Firefox XML parsing issue (965391ab)
  • Make Ajax tests pass in iOS 9 (d051e0e3)

jQuery 3.6.1 Maintenance Release

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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

CSS

  • Skip falsy values in `addClass( array )`, compress code (#4998, 9b34bdb1)
  • Justify use of rtrim on CSS property values (a1373e2e)
  • Remove a redundant extension from rtrimCSS inclusion in curCSS (509eeb89)
  • Trim whitespace surrounding CSS Custom Properties values (#4926, 219ccf5c)

Deprecated

  • Improve $.trim performance for strings with lots of whitespace (69940100)

Docs

  • Update webpack website in README (410d5cf0)
  • add link to preview the new CLAs (b24e83bd)
  • Replace `#NUMBER` Trac issue references with `trac-NUMBER` (95e34b69)
  • remove expired links from old jquery source (c3c4d207)
  • Remove links to Web Archive from source (#4981, 4b0d8900)
  • Update the URL to the latest jQuery build in CONTRIBUTING.md (4bb7d069)
  • Remove the CLA checkbox in the pull request template (93406490)

Event

  • Don’t break focus triggering after `.on(focus).off(focus)` (#4867, b3e4a7eb)

Manipulation

Tests

  • Exclude tests based on compilation flags, not API presence (3.x version) (#5069, bc165128)
  • Workaround an XML parsing bug in Firefox (be3bd560)
  • lock colors version to 1.4.0 (fa70e8fd)
  • Skip ETag AJAX tests on TestSwarm (81fa1e2a)
  • Allow statusText to be “success” in AJAX tests (7439e221)
  • Disable CSS Custom Properties tests in old Safari/iOS (e9f77267)
  • Make Karma browser timeout larger than the QUnit one (a51eec74)
  • Don’t remove csp.log in the cspClean action of mock.php (ba81326f)
  • Load the TestSwarm listener via HTTPS (f6f07204)
  • Switch background image from online file to local 1×1.jpg (8d20cb97)
  • Strip untypical callback parameter characters from mock.php (b14b62c8)

Infrastructure

  • Update GitHub Actions (0f6c3d9e)
  • Add dependabot.yml config (GitHub Actions) (5a363017)
  • Test on Node 17, update Grunt & `karma-*` packages (9bc0df70)
  • Separate the install step from running tests in GitHub Actions (cb35067f)
  • remove travis.yml and travis mentions from core (#4984) (55669883)
  • Migrate CI to GitHub Actions (b39cfa15)
  • Test on Node.js 16 instead of 15 (f12cac60)
  • Take core-js from the external directory as well (752b8981)
  • Updating the 3.x-stable version to 3.6.1-pre. (3642471e)

jQuery project updates addressing temporary CDN issues

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As part of its ongoing infrastructure updates, the jQuery infrastructure team is making configuration and deployment changes to address intermittent outages reported by some users. The issue is the result of faulty IP allowlisting which affects users downloading jQuery project assets from certain IP addresses.

This issue is expected to be resolved in the next few weeks. In the interim, users can mitigate the issue by downloading and serving the files they need.

CDN migration is part of a package of infrastructure improvement projects the project has been undertaking this year. The infrastructure team plans to provide a full overview of these improvements, which will help support the long-term maintenance of jQuery and its related projects, later this summer.

jQuery continues to be a widely-used open source project with active maintainers. While many sites host jQuery locally, others rely upon the jQuery CDN to deliver the library on demand. On average, the jQuery CDN delivers over 2 petabytes of code per month. The project is hosted at the OpenJS Foundation, the vendor-neutral organization to grow and sustain the JavaScript and web ecosystem.

jQuery 3.6.0 Released!

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jQuery 3.6.0 has been released! In jQuery 3.5.0, the major change was a security fix for the html prefilter. This release does not include a security fix, but does have some good bug fixes and improvements. We still have our eyes on a jQuery 4.0 release, but until then we will continue to support the 3.x branch and address important issues.

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 3.6.0:

Returning JSON even for JSONP errors

You may have guessed from the minor version that a feature snuck into this release. In previous versions, when a JSONP request responded with an error, often the response was still an executable script. We’ve changed the default behavior to try and execute the response in this situation. Normal scripts will still be skipped when an error is encountered. See gh-4771 for more information.

Fixes

One bug worth highlighting has to do with redirecting focus to another element in a focus handler. Take this example where a focus handler is triggered inside another focus handler:

elem1.on( "focus", function() {
  elem2.trigger( "focus" );
} );

Due to their synchronous nature everywhere outside of IE, a fix added in 3.4.0 to leverage native events caused the native .focus() method to be called last for the initial element, making it steal the focus back. While the code continues to leverage native focus and blur events, we were able to fix this by aligning even more with native methods and only propagating the last focus event up the DOM tree.

Other bug fixes and improvements include a fix for retrieving dimensions on table rows in Firefox, a fix for a crash in Chrome when a focusout event was triggered on a removed element, several improvements to some tests, and more. You’ll find the full changelog below.

Upgrading

Aside from the change to no longer ensure XHTML-compliant tags for you, we do not expect other 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-3.6.0.js

https://code.jquery.com/jquery-3.6.0.min.js

You can also get this release from npm:

npm install jquery@3.6.0

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-3.6.0.slim.js

https://code.jquery.com/jquery-3.6.0.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 Dallas Fraser, Michal Golebiowski-Owczarek, Wonseop Kim, Wonhyoung Park, Beatriz Rezener, Natalia Sroka, and the whole jQuery team.

Changelog

Full changelog: 3.6.0

Ajax

Core

Deferred

Dimensions

  • Modify reliableTrDimensions support test to account for FF (#4529, bcd40aa7)

Docs

  • Change JS Foundation mentions to OpenJS Foundation (db43ef0b)

Event

Selector

Support

  • ensure display is set to block for the support div (#4844) (#4832, f8bdb127)

Tests

  • Fix tests for not auto-executing scripts without dataType (7298e04f)
  • Skip the jQuery.parseXML error reporting test in Legacy Edge (bf06dd47)
  • Fix the jQuery.parseXML error reporting test (1ec36332)
  • Recognize callbacks with dots in the Node.js mock server (4c572a7f)
  • Skip the “jQuery.ajax() on unload” test in Safari (4f016c64)
  • Remove an unused local variable (beea433d)
  • Remove remaining obsolete jQuery.cache references (5e028c76)
  • Remove obsolete jQuery data tests (8ad78cdb)

jQuery 3.5.1 Released: Fixing a Regression

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I’ve never gotten to say this on a jQuery release, but May the 4th be with you! A short time ago in a galaxy exactly like this one, we released jQuery 3.5.0. We have a quick fix for a regression in that release.

Specifically, we had changed our internal data object to use Object.create( null ) instead of a plain object ({}). We did that to prevent collisions with keys on Object.prototype properties. However, this also meant that users (especially plugins) could no longer check what was in jQuery data with the native .hasOwnProperty() method, and it broke some code. We’ve reverted that change, but plan to put it back in jQuery 4.0. This change is the only code change in this release. Other changes include some minor updates to our docs and build system.

Security fixes in 3.5.0

jQuery 3.5.0 included fixes for two security issues in jQuery’s DOM manipulation methods, as in .html(), .append(), and the others. Security advisories for both of these issues have been published on GitHub. While we provided all of the details on the first issue in the jQuery 3.5.0 blog post, we did not provide all of the details on the second and would like to do that in this post.

The second issue was very similar to the first. It was an XSS vulnerability that had to do with passing <option> elements to jQuery’s DOM manipulation methods. Essentially, we’re using a regex to wrap <option> elements with <select> elements to ensure those elements get parsed correctly in old IE (IE <= 9 replaces any <option> tags with their contents when inserted outside of a <select> element).

Our fix is to only apply this code where it is needed. Fortunately, because of the different parsing behavior in IE9, we can keep the fix in IE9 without exposing it to the same vulnerability as other browsers. Please upgrade when you get a chance to avoid these vulnerabilities.

Upgrading

If you haven’t yet upgraded to jQuery 3.5, have a look at the 3.5 Upgrade Guide. If you haven’t yet upgraded to jQuery 3+, first have a look at the 3.0 Upgrade Guide. Also, the jQuery Migrate plugin will help you to identify compatibility issues in your code.

If you can’t yet upgrade to 3.5+, Daniel Ruf has kindly provided patches for previous jQuery versions. Please try out this new release and let us know about any issues you experienced.

Download

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

https://code.jquery.com/jquery-3.5.1.js

https://code.jquery.com/jquery-3.5.1.min.js

You can also get this release from npm:

npm install jquery@3.5.1

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-3.5.1.slim.js

https://code.jquery.com/jquery-3.5.1.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 Pierre Grimaud, Michal Golebiowski-Owczarek, Ed S, vanillajonathan, and the whole jQuery team.

Changelog

Full changelog: 3.5.1

Build

  • Test on Node.js 14, stop testing on Node.js 8 & 13 (205dd134)
  • Enable reportUnusedDisableDirectives in ESLint (b21d6710)
  • Updating the 3.x-stable version to 3.5.1-pre. (898784ab)

Data

Docs

Tests

  • Workaround failures in recent XSS tests in iOS 8 – 12 (ea2d0d50)
  • Add tests for recently fixed manipulation XSS issues (58a8e879)
  • Cleanup `window` & `document` handlers in a new event test (c1c0598d)
  • Fix flakiness in the “jQuery.ajax() – JSONP – Same Domain” test (46ba70c5)

jQuery 3.5.0 Released!

Posted on by

jQuery 3.5.0 has been released! 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.

We hope you’re staying healthy and safe while so many of us are stuck at home. With a virus ravaging the planet, we realize that jQuery may not be a high priority for you or the sites you manage. When you do have a moment, we recommend that you review this new version and upgrade.

Security Fix

The main change in this release is a security fix, and it’s possible you will need to change your own code to adapt. Here’s why: jQuery used a regex in its jQuery.htmlPrefilter method to ensure that all closing tags were XHTML-compliant when passed to methods. For example, this prefilter ensured that a call like jQuery("<div class='hot' />") is actually converted to jQuery("<div class='hot'></div>"). Recently, an issue was reported that demonstrated the regex could introduce a cross-site scripting (XSS) vulnerability.

The HTML parser in jQuery <=3.4.1 usually did the right thing, but there were edge cases where parsing would have unintended consequences. The jQuery team agreed it was necessary to fix this in a minor release, even though some code relies on the previous behavior and may break. The jQuery.htmlPrefilter function does not use a regex in 3.5.0 and passes the string through unchanged.

If you absolutely need the old behavior, using the latest version of the jQuery migrate plugin provides a function to restore the old jQuery.htmlPrefilter. After including the plugin you can call jQuery.UNSAFE_restoreLegacyHtmlPrefilter() and jQuery will again ensure XHTML-compliant closing tags.

However, to sanitize user input properly, we also recommend using dompurify with the SAFE_FOR_JQUERY option to sanitize HTML from a user. If you don’t need the old behavior, but would still like to sanitize HTML from a user, dompurify should be used without the SAFE_FOR_JQUERY option, starting in jQuery 3.5.0. For more details, please see the 3.5 Upgrade Guide.

Features

With what we call “positional selectors” being deprecated and slated for removal in jQuery 4.0, we’ve added the last two necessary replacement methods. Specifically, we’ve added the .even() and .odd() methods to replace the :even and :odd selectors. With these methods in place, we can safely remove these overly complicated selectors in jQuery 4.0.

Another small feature that we’ve added to this release is the ability to add a context to jQuery.globalEval. This was done as part of fixing a bug with script execution in iframes.

Fixes

One bug worth highlighting is a bug we fixed in the Ajax script transport. jQuery used to evaluate any response to a request for a script as a script, which is not always the desired behavior. This is different than other data types where such a convention was fine (e.g. in the case of JSON). jQuery 3.5.0 will now only evaluate successful HTTP responses.

Other bug fixes and improvements include performance improvements in Sizzle, support for massive arrays in jQuery.map, using the native .flat() method where supported, a fix for syntax errors in the AMD modules, several improvements to our testing infrastructure, and more. You’ll find the full changelog below.

Deprecations

It wouldn’t be a jQuery release without some deprecations. In jQuery 3.5.0, we’ve put jQuery.trim on the list. JavaScript’s own String.prototype.trim() is an easy replacement for it.

We’ve also put AJAX event aliases on the list, they can be replaced by .on("ajaxStart", …) and the like. jQuery Migrate will warn about these now-deprecated methods, but they’ll stick around until jQuery 4.0.

Upgrading

Aside from the change to no longer ensure XHTML-compliant tags for you, we do not expect other 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-3.5.0.js

https://code.jquery.com/jquery-3.5.0.min.js

You can also get this release from npm:

npm install jquery@3.5.0

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-3.5.0.slim.js

https://code.jquery.com/jquery-3.5.0.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 Ahmed S. El-Afifi, Michal Golebiowski-Owczarek, Wonseop Kim, Dave Methvin, Shashanka Nataraj, Pat O’Callaghan, Sean Robinson, Christian Oliff, Christian Wenz, and the whole jQuery team.

We also would like to thank Masato Kinugawa for helping us identify and fix the security-related issues in this release.

Changelog

Full changelog: 3.5.0

Ajax

  • Do not execute scripts for unsuccessful HTTP responses (#4250, #4655, da3dd85b)
  • Overwrite s.contentType with content-type header value, if any (#4119, 065143c2)
  • Deprecate AJAX event aliases, inline event/alias into deprecated (7a3cf9c0)

Build

  • Resolve Travis config warnings (7506c9ca)
  • Enable ESLint one-var rule for var declarations in browser code (0fdfdd82)
  • Test the no-Sizzle build on Travis (362075ae)
  • Update .mailmap & AUTHORS.txt (19f2dcba)
  • Tests: Fix custom build tests, verify on Travis; name Travis jobs (d525ae34)
  • Lint the minified jQuery file as well (#3075, 37df5cdf)
  • Make Karma work in AMD mode (46c284b1)
  • Create a `grunt custom:slim` alias for the Slim build (4cbdc745)
  • Run tests on Travis only on browsers defined in the config (471b0043)
  • Run tests on Firefox ESR as well (0a73b94a)
  • Run tests on Node.js 13 in addition to 8, 10 & 12 (64c1fcc1)
  • Drop workarounds for Node.js 6 in Gruntfile.js (9f4204ec)
  • Run tests on Travis on FirefoxHeadless as well (ad3c2efa)
  • Require strict mode in Node.js scripts via ESLint (ac2da4e6)
  • Support jquery-release –dry-run flag (c7a5e1bd)
  • Stop copying src/core.js to dist on release (#4489, 279d2e97)
  • ESLint: forbid unused function parameters (d7e13f12)
  • Fix the regex parsing AMD var-modules (#4389) (36b59c96)

Core

  • Ajax: Align nonce & global with master, fix an AMD issue (22bf701f)
  • Fire iframe script in its context, add doc param in globalEval (#4518, 3dedc3f2)
  • Deprecate jQuery.trim (#4363, 56e73e0c)
  • Use Array.prototype.flat where supported (#4320, 2f666c1d)
  • Implement .even() & .odd() to replace POS :even & :odd (409cbda7)

CSS

  • Workaround buggy getComputedStyle on table rows in IE/Edge (#4490, 6d31477a)

Data

  • Event:Manipulation: Prevent collisions with Object.prototype (#3256, 413ff796)

Docs

  • Update links to EdgeHTML issues to go through Web Archive (d72faced)
  • Convert link to Homebrew from HTTP to HTTPS (ff5a43eb)

Effect

  • Fix a unnecessary conditional statement in .stop() (#4374, 30f5c6c3)

Event

  • Use only one focusin/out handler per matching window & document (#4652, 9e15d6b4)
  • Only attach events to objects that accept data – for real (#4397, f36f6abb)

Manipulation

  • Skip the select wrapper for option elements
  • Make jQuery.htmlPrefilter an identity function (1d61fd94)

Offset

Selector

Tests

  • Blacklist one focusin test in IE (1a4f10dd)
  • Pass a number of necessary done() calls to assert.async() (5ea844f6)
  • Make the support tests pass on Firefox 4x/5x/60 (f0d5ec62)
  • Skip a “width/height on a table row with phantom borders” test in Firefox (c79e1d5f)
  • Don’t test synchronous XHR on unload in Chrome (c5b48c8c)
  • Fix offset fractions tests in Chrome for Android (0c67da4b)
  • Move Android user agent detection above iOS, put Safari last (6276cb2e)
  • Make support tests accept Safari 13 & newer (8167327f)
  • update npo.js and include unminified source instead (3654bc83)

Traversing

  • Fix contents() on object elements with children in IE (90f78b9a)
  • Fix contents() on object elements with children (#4384, 42badf34)

jQuery 3.4.1: triggering focus events in IE and finding root elements in iOS 10

Posted on by

Hello again! jQuery 3.4.0 was released just three weeks ago, but we’ve had a few issues reported that warranted a patch release. Thank you to everyone that reported issues and helped us get these fixed quickly. Here are the changes:

Triggering focus or blur more than once in IE

jQuery 3.4.0 came with some changes to the way the event handler triggered native events such focus and blur. These changes caused a regression that sometimes resulted in an enigmatic error being thrown in the form of "saved.shift is not a function". This is now fixed.

Example

// Error thrown in IE10-11
// after clicking #test-element twice
jQuery("#test-element").click(function() {
  jQuery(this).trigger("blur");
});

Checking element attachment in iOS 10.0-10.2

When releasing 3.4.0, we ran our tests in several versions of iOS, including iOS 10.3 but not 10.0-10.2. Those versions do not support a native function we use to determine whether an element is attached to the DOM. Other versions of iOS were not affected. We added a guard to ensure that this method exists and fall back to other options if necessary.

Loading jQuery with AMD

A small module was added in jQuery 3.4.0 that used the global jQuery rather than the local jQuery loaded with AMD. This resulted in "jQuery is undefined" errors when loading with AMD, but this should now be fixed.

 

Upgrading

There should be no compatibility issues if upgrading from jQuery 3.0+. If you haven’t yet upgraded to jQuery 3+, please have a look at the 3.0 Upgrade Guide. The jQuery Migrate 3.0 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.

Download

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

https://code.jquery.com/jquery-3.4.1.js

https://code.jquery.com/jquery-3.4.1.min.js

You can also get this release from npm:

npm install jquery@3.4.1

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-3.4.1.slim.js

https://code.jquery.com/jquery-3.4.1.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 Richard Gibson, Michal Golebiowski-Owczarek, and the whole jQuery team.

Changelog

GitHub changelog: Issues fixed in 3.4.1 | All changes

Build

  • Fix unresolved jQuery reference in finalPropName (#4358, 0d4af529)

Core

Event

  • Prevent leverageNative from registering duplicate dummy handlers (6c1e7dbf)
  • Fix handling of multiple async focus events (#4350, 24d71ac7)

jQuery 3.4.0 Released

Posted on by

jQuery has a new release! It’s been a while since our last release, but we expect this to be the last minor release in the 3.x branch, and then we will move on to the overhaul that will be jQuery 4.0. But before we get to 4.0, we’re excited to share the bug fixes and improvements included in jQuery 3.4.0. Here are some of the highlights:

Performance improvement in .width and .height

When getting and setting dimensions, there were certain cases where this could cause layout thrashing, which basically means that the browser calculated layout more times than necessary. We fixed this in all browsers except IE, where it can’t be avoided.

nonce and nomodule support

To support adding script elements through methods like .html and .append, jQuery separates them and appends new script tags to load and execute the remote content. During this process, attributes such as nonce and nomodule were ignored, but jQuery 3.4.0 now hangs onto them.

Radio elements: expected state in event handlers

We had already fixed the same issue with checkboxes, but accidentally left out radio inputs. In the following example, true was logged the first time the element was clicked. We fixed it so that the checked property is updated before the event handler is executed.

Example

var $radios = jQuery(".example");
var $firstRadio = $radios.first();
var firstCheckedState = $firstRadio.prop("checked");
$radio.on("click", function() {
  // true in <3.4.0
  console.log($firstRadio.prop("checked") === firstCheckedState);
});
$radios.eq(1).click();

Minor vulnerability fix: Object.prototype pollution

jQuery 3.4.0 includes a fix for some unintended behavior when using jQuery.extend(true, {}, ...). If an unsanitized source object contained an enumerable __proto__ property, it could extend the native Object.prototype. This fix is included in jQuery 3.4.0, but patch diffs exist to patch previous jQuery versions.

Example

jQuery.extend(true, {},
  JSON.parse('{"__proto__": {"test": true}}')
);
console.log( "test" in {} ); // true

Note that while jQuery does its best to protect users from security vulnerabilities, jQuery is a DOM manipulation library that will generally do what you tell it to do. In this case, the behavior was likely unexpected, so jQuery.extend will no longer write any properties named __proto__. But guards such as this one are not replacements for good security practices such as user input sanitization.

Deprecating positional selectors and the sunset of Sizzle

The basic API of jQuery is to select something and then do something with what was selected. Sizzle, the selector engine in jQuery, handles the first half. It’s been a fast and efficient little engine that has paved the way for native selector APIs like querySelectorAll and additional native JavaScript and CSS selectors. Now that many of these selectors have made their way into modern browsers, it’s almost time to say goodbye to Sizzle. But in order to remove Sizzle in jQuery 4.0, we will also need to remove what we refer to as positional selectors, which are non-standard selectors.

Specifically, jQuery 3.4.0 is deprecating :first, :last, :eq, :even, :odd, :lt, :gt, and :nth. When we remove Sizzle, we’ll replace it with a small wrapper around querySelectorAll, and it would be almost impossible to reimplement these selectors without a larger selector engine.

We think this trade-off is worth it. Keep in mind we will still support the positional methods, such as .first, .last, and .eq. Anything you can do with positional selectors, you can do with positional methods instead. They perform better anyway.

Upgrading

There should be no compatibility issues if upgrading from jQuery 3.0+. If you haven’t yet upgraded to jQuery 3+, please have a look at the 3.0 Upgrade Guide. The jQuery Migrate 3.0 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.

Download

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

https://code.jquery.com/jquery-3.4.0.js

https://code.jquery.com/jquery-3.4.0.min.js

You can also get this release from npm:

npm install jquery@3.4.0

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-3.4.0.slim.js

https://code.jquery.com/jquery-3.4.0.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 abnud1, Jason Bedard, buddh4, Kris Borchers, Andrei Fangli, Oleg Gaidarenko, Richard Gibson, Michal Golebiowski-Owczarek, Marja Hölttä, Dave Methvin, Ed S, Luis Emilio Velasco Sanchez, Saptak Sengupta, tmybr11, Bert Zhang, and the whole jQuery team.

Changelog

GitHub changelog: Issues fixed in 3.4.0 | All changes

Ajax

Core

  • Use isAttached to check for attachment of element (662083ed)
  • Tiny efficiency fix to jQuery.extend / jQuery.fn.extend (#4246) (#4245, 4ffb1df8)
  • Preserve CSP nonce on scripts with src attribute in DOM manipulation (#4323, 00504037)
  • Preserve CSP nonce on scripts in DOM manipulation (#3541, c7c2855e)
  • Support passing nonce through jQuery.globalEval (#4278, 5bdc85b8)
  • Recognize Shadow DOM in attachment checks (#3504, 9b77def5)
  • Prevent Object.prototype pollution for $.extend( true, … ) (753d591a)

CSS

  • Ensure camel- vs kebab-cased names are not collapsed for CSS vars (f8c1e902)
  • Avoid filling jQuery.cssProps (#3986, 2b5f5d5e)
  • Correctly detect scrollbox support with non-default zoom (#4029, 821bf343)
  • Don’t auto-append “px” to CSS variables (#4064) (#4063, 75b77b48)
  • Skip the px-appending logic for animations of non-element props (f5e36bd8)
  • Avoid forcing a reflow in width/height getters unless necessary (#4322, a0abd15b)
  • Don’t read styles.position in the width/height cssHook unless necessary (#4185, 354f6036)
  • Don’t auto-append “px” to possibly-unitless CSS grid properties (#4007, f997241f)

Dimensions

  • fix computing outerWidth on SVGs (#3964, e743cbd2)
  • avoid fetching boxSizing when setting width/height – this avoids forcing a reflow in some cases (#3991, 73d7e625)
  • fall back to offsetWidth/Height for border-box in IE (#4102, 315199c1)

Event

  • Prevent leverageNative from double-firing focusin (fe5f04de)
  • Add “code” property to Event object (#3978, 899c56f6)
  • Leverage native events for focus/blur/click; propagate additional data (#1741, #3423, #3751, #4139, 669f720e)
  • Respect script nomodule attribute in DOM manipulation (#4281, e4de8b46)
  • Restore _evalUrl jQuery.ajax calls to dataType: script (13de7c9e)
  • Only evaluate HTTP-successful script src (#4126, c2026b11)

Manipulation

  • Properly detect HTML elements with single-character names (#4124, 979809c5)

Misc

  • Add config for lockbot (2348f399)
  • Update license prolog/epilog to placate Github checker (29e76e25)

README

  • add gitter badge to README.md (7869f83d)
  • Add FOSSA license scan status badge (45f08588)

Selector

Serialize

  • jQuery.param: return empty string when given null/undefined (#2633, 0645099e)

Traversing

Internal

  • Seasonal update of uglify and its options (09684ba3)
  • Remove unnecessary ESLint exception (dc05f3c1)
  • Run the basic test suite in jsdom (0ec25abb)
  • Remove manual QUnit fixture resetting (84b6a0be)
  • Make Promises/A+ tests use the dot reporter instead of the default (ca9356ec)
  • Update QUnit from 1.23.1 to 2.9.2 (6ced2639)
  • Run Karma browser tests on Node.js 10 instead of 8 (16ad9889)
  • Update jsdom; migrate a test with Symbol polyfill to an iframe test (9cb124ed)
  • Remove obsolete globals from ESLint configuration (c10945d0)
  • Update most dependencies (8751e9ef)
  • Update test code for compatibility with QUnit 2.x (#4297) (c3498187)
  • Advise to create test cases on JS Bin or CodePen, drop JSFiddle (da44ff39)