Change Log

v1.1.0 — 05 Dec 2013diff

Notable changes

  • IE10+ support
  • Huge speed optimizations for simple CSS selectors (classname, ID) and DOM element creation
  • Provide $.Callbacks and $.Deferred in optional modules
  • Removed fx and detect modules from default build


  • New supported $.ajax() options:
    • xhrFields
    • mimeType
    • jsonpCallback
    • username & password
  • Promise interface supported when loading the optional “callbacks” and “deferred” modules:
    • xhr.done(function(data, status, xhr){ ... })
    •, errorType, error){ ... })
    • xhr.always(function(){ ... })
  • Enable mutating Ajax settings in the beforeSend callback
  • Fix JSONP callbacks for errored responses on Android
  • Ensure consistent Accept request HTTP header across browsers
  • Fix $.param() for jQuery compatibility when handling complex nested objects
  • Support IIS JavaScript MIME type
  • Pass “abort” and “timeout” status to global ajaxError event handlers


  • Provide isDefaultPrevented(), stopImmediatePropagation(), and related methods for all events
  • Support the data argument in .bind(), .on(), and .one()
  • Support CSS selector argument in .one() for event delegation
  • Support .on('ready') as an alias for .ready()
  • Enable event handlers on plain old JS objects
  • Many fixes related to event delegation


  • Cleanup .data() values on DOM element removal with .remove/empty()
  • .data() now assumes that numbers that begin with zeroes are strings
  • .removeData() (no argument) now removes all data on the element
  • Enable reading data-* attributes that have underscores in the name


  • Support simple DOM property names in .prop(name) such as for, class, readonly
  • Implement the .scrollLeft([value]) method
  • Support setting .scrollTop(value)
  • Fix $(document).width/height()
  • Support fetching multiple CSS values via array in .css(['prop1', 'prop2', ...])
  • Support setting CSS transition delay via delay option for .animate()
  • Ensure that .animate() callback always firesParty like it’s one-oh!_

v1.0 — 02 Mar 2013diff

Party like it’s one-oh!

Notable changes

  • Zepto is now compatible with Twitter Bootstrap
  • Portable, completely new node.js-based build system
  • Fully automated tests with PhantomJS and Travis CI
  • Removed touch module from default distribution

New features

  • $.fn.filter(function(index){ ... })
  • $.fn.contents()
  • $.fn.wrapInner()
  • $.fn.scrollTop()
  • $.contains()
  • $.fn.has()
  • $.fn.position()
  • $.fn.offsetParent()
  • $.parseJSON()
  • $.camelCase()
  • $.isWindow()
  • $.grep() (interface to Array.filter)
  • Support $(html, attributes) syntax for element creation
  • Emulate mouseenter and mouseleave events
  • Bootstrap compat: support $.fn.offset(coordinates)
  • Bootstrap compat: implement $.fn.detach()
  • Add support for Ajax cache: false option
  • Prevent scrolling when horizontal swipe events are detected
  • cancelTouch for tap events
  • prev and next now support an optional selector argument
  • $.fn.find and $.fn.closest now support Zepto objects as arguments
  • Enable deep copy via $.extend(true, target, source)
  • Enable nested structures for $.fn.wrap() and $.fn.wrapAll()
  • Enable function arguments for $.fn.wrap() and $.fn.wrapInner()
  • Support number, boolean, JSON types in data attributes
  • Support manipulating classnames on SVG elements
  • Enable named durations for animate, e.g. slow.
  • Support timing-function for animate
  • Support event properties passed to $.fn.trigger() or $.Event()
  • Selector module: support child > * queries
  • Add detect support for mobile Chrome browser
  • Add $ and $.os.tablet (booleans)
  • Detect Firefox mobile, Playbooks and BB10


  • Fix passing null selector to on or off
  • Fixed bug where self-closing html tags would act as open tags
  • Fix val for multiple select
  • Fix various touch and gesture bugs.
  • Corrected parameters of load success callback to match jQuery.
  • Fix css with 0 values and falsy values
  • Fix a css performance issues with string values
  • Fix $.ajaxJSONP when invoked directly
  • Fix animate with 0 durations.
  • Fix toggle and fadeToggle for multiple elements.
  • Fix ajax $.fn.load behavior with selector
  • Make attr(name, null) unset attribute
  • Fix animate in Firefox
  • Fix animate for elements just added to DOM
  • Fix an escaping issue with $.param
  • Respect traditional: true option in $.ajax
  • Fix focus & blur event delegation and enable unbind
  • Simple wrapping for any object passed to $()
  • Enable children method for XML documents
  • Don’t eval <script> content when src is present
  • Support processData option for $.ajax()
  • Enable passing contentType: false to $.ajax()
  • Apply focus() and blur() to all elements in collection
  • Change $ to return a Zepto collection
  • Selector argument for on(evt, selector, fn) can be false
  • Don’t raise error on $('#')
  • Provide empty object in $.support
  • return false in event handler calls stopPropagation()
  • Fix $.isPlainObject() for window in Opera
  • $.ajax error callback correctly reports abort status
  • Fix hasClass in collections of multiple elements
  • Stop iteration in each() when the callback returns false
  • Add ability to set xhr factory per-request
  • Have get() method accept negative index
  • Support for multiple class names in toggleClass()
  • Fix error callbacks for ajaxJSONP
  • Support optional data argument for various Ajax methods
  • Fix DOM insertion operators for null values
  • Fix dataType being set for $.getJSON

v1.0rc1 — 09 Apr 2012diff

The semicolon-free edition! That’s right, we removed all trailing semicolons from the source and tests. They were never needed anyway.

New methods:

New module:

  • “selector.js” with experimental support for jQuery CSS pseudo-selectors such as :visible and :first

Improvements in core:

  • added missing methods for Ember.js compatibility
  • improved creating DOM fragments from HTML with $())
  • enable append & family to accept multiple arguments
  • fix $.each context
  • fix calling get without index
  • fix calling val on empty collection
  • using css(property, '') removes the property
  • fix filter, is, and closest when operating on nodes that are detached from the document
  • remove end & andSelf from core to the new “stack.js” plugin
  • exposed important internal Zepto functions through the $.zepto object for extending or overriding Zepto functionality.
  • data method returns undefined when there is no data
  • support camelized names in data method

Apart from improving the basic data method in core, the “data.js” module got improvements as well:

  • better jQuery compatibility
  • ability to store functions
  • new removeData method


  • have correct ajaxComplete argument order for JSONP abort and timeout
  • JSONP requests that hit a 404 will now correctly invoke the error callback
  • add support for dataType: 'jsonp' in $.ajax
  • add support for data in $.ajaxJSONP
  • HTTP 304 status is treated as success instead of an error
  • made load more compatible with jQuery
  • allow Content-Type to be set via request headers
  • respect Content-Type of the response if dataType isn’t set
  • work around Chrome CORS bug when data is empty

Changes in other modules:

  • fix animate for edge cases such as when there is an animation within an animated element, and improve handling of transition CSS properties
  • new “singleTap” event
  • improved “longTap” detection

0.8 — 03 Nov 2011diff

  • CSS transitions for every browser with animate() method;
  • unified event handling with fn.on() & off();
  • Ajax global events & timeout support;
  • performance boost for selectors.

See full release notes.

0.7 — 01 Aug 2011diff

  • add $.each, $.map, $.slice;
  • add .serializeArray(), .serialize();
  • add .triggerHandler();
  • add .wrap, .wrapAll, .unwrap, .width/height setters, .append (and friends) improvements;
  • add “longTap” event;
  • .anim() accepts CSS transform properties;
  • return false in event handlers cancels browser event behavior.

0.6 — 14 May 2011diff

  • add .add, .appendTo, .prependTo, .replaceWith, .empty, .submit;
  • allow function args for .add/.remove/.toggleClass;
  • improvements to events and xhr.

0.5 — 01 Mar 2011diff

  • add .not, .children, .siblings, $.param;
  • improve .attr & .html;
  • support callback for .anim.

0.4 — 21 Jan 2011diff

  • JSONP;
  • better .find, .each, .closest;
  • add .eq, .size, .parent, .parents, .removeAttr, .val;
  • support function args in .html, .attr;
  • adjacency methods now take Zepto objects.

0.3 — 17 Dec 2010diff

  • add .toggleClass, .attr setter, .last, .undelegate, .die;
  • proxied event objects for event delegation;
  • support $ fragments.

0.2 — 01 Dec 2010diff

  • now compatible with backbone.js;
  • support event unbind;
  • ajax posts with data.

0.1 — 26 Oct 2010

First. Release. Ever.

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