In nearly every version of Chrome, we see a significant number of updates and improvements to the product, its performance, and also capabilities of the Web Platform. This article describes the deprecations and removals in Chrome 59, which is in beta as of April 27. This list is subject to change at any time.
Remove features from WebVR that are not in the revised spec
The current implementation of WebVR, originally implemented in Chrome 52, contained several methods and properties that will not be in the final spec. Deprecation messages were added for these features for the Origin Trial that started in Chrome 56. These features and are now being removed. They include:
Remove FileReaderSync from service workers
The Service Worker spec has always had the (non-normative) note that "any type
of synchronous requests must not be initiated inside of a service worker", to
avoid blocking the service worker (as blocking the service worker would block
all network requests from controlled pages). However synchronous APIs such as
FileReaderSync were still available in service workers.
deprecated in Chrome 57. It is removed in Chrome 59.
Remove non-standard DeviceOrientation Event initialization functions
For some time now there's been a general trend in browser APIs away from
initialization functions and toward object constructors. The most recent version
of the DeviceOrientation Event Specification
follows this trend by requiring constructors for both
Since Chrome is
enabling these constructors by default
in Chrome 59 the legacy initialization fuctions,
initDeviceOrientationEvent() are also removed. Edge has deprecated the
initialization functions and Firefox has already shipped the constructors.
Remove "on-demand" value for hover/any-hover media queries
The “on-demand” value for hover/any-hover media queries was removed from the spec about a year ago. Consequently, these media queries are removed in Chrome 59.
In Chrome 48 the
MediaStreamTrack.remote property was added in support of the
Media Capture and Streams API
is from a remote source or a local one.
Since that time, this property has been removed from the spec. As of Chrome 59, it is no longer supported.
Remove support creating ProgressEvent with document.createEvent()
Earlier versions of the DOM spec required implementation of
document.createEvent("ProgressEvent"). However usage was always low and
support has already been removed from
Webkit. The event itself was
removed from the spec in March
of this year.
To conform with the platform and most recent spec,
ProgressEvent is now removed from Chrome.
Remove SVGTests.required Features
In the first version of the SVG spec, an application could call
DOMImplementation.hasFeature to verify that a particuilar SVG interface is
supported. Many SVG elements contained a
requiredFeatures attribute that
returned the same information.
DOMImplementation.hasFeature property always returns true.
requiredFeatures no longer does anything useful. Because it was
removed from the spec
it was deprecated in Chrome 54 and has now been removed.
To keep the platform healthy, we sometimes remove APIs from the Web Platform which have run their course. There can be many reasons why we would remove an API, such as:
- They are superseded by newer APIs.
- They are updated to reflect changes to specifications to bring alignment and consistency with other browsers.
- They are early experiments that never came to fruition in other browsers and thus can increase the burden of support for web developers.
Some of these changes will have an effect on a very small number of sites. To mitigate issues ahead of time, we try to give developers advanced notice so they can make the required changes to keep their sites running.
Chrome currently has a process for deprecations and removals of API's, essentially:
- Announce on the blink-dev mailing list.
- Set warnings and give time scales in the Chrome DevTools Console when usage is detected on the page.
- Wait, monitor, and then remove the feature as usage drops.
You can find a list of all deprecated features on chromestatus.com using the deprecated filter and removed features by applying the removed filter. We will also try to summarize some of the changes, reasoning, and migration paths in these posts.