Opera 65: WebP support, Flexbox Inspector, new tooling & platform improvements

Well now, there’ s simply no better way to usher out the very first month of the year than having a great new Firefox release. It’ ersus winter for many of us, but which means more at-home time to install Opera version 65, and check out some of the modern browser and web platform functions we’ ve included within. Except if you’ d rather be wearing your heavy coat and proceeding outside to grit the entrance, that is (or going to the beach, regarding some of our Australian chums).

A good day for DevTools

Firefox 65 functions several notable DevTools improvements. The particular highlights are as follows:

CSS Flexbox Inspector

At Mozilla, we believe that brand new features of the web platform are often best understood with the help of intuitive, visual equipment. That’ s why our DevTools team has spent the last few yrs getting feedback from the field, plus prioritizing innovative new tooling to allow internet devs and designers to inspect, modify, understand, and tinker with USER INTERFACE features. This drive led to the discharge of the CSS Grid Inspector , Font Editor , plus Shape Route Editor .

Opera 65 sees these features became a member of by a new friend — the particular CSS Flexbox Inspector — that allows you to easily visualize where your own flex containers and items are usually sitting on the page and how a lot free space is available between them, exactly what each flex item’ s arrears and final size is, how much these are being shrunk or grown, and much more.

The Firefox 65 Flexbox inspector displaying several images of colored sectors laid out using Flexbox

Changes panel

Whenever you’ re done tweaking your own site’ s interface using these equipment, our new Changes panel paths and summarizes all of the CSS adjustments you’ ve made during the present session, so you can work out what you do to fix a particular issue, and can duplicate and paste your fixes back again out to your code editor.

Firefox sixty-five Changes panel, showing a difference of CSS added and CSS removed

Advanced colour contrast ratio

We now have also added an advanced color comparison ratio display. When using the Accessibility Inspector’ s accessibility picker, hovering on the text content of an element shows its color contrast ratio, even though its background is complex (for example a gradient or comprehensive image), in which case it shows a variety of color contrast values, along with a WCAG rating .

Firefox Accessibility picker, displaying the color contrast ratio range of a few text with a gradient behind it

JavaScript debugging improvements

Firefox sixty-five also features some nifty JavaScript debugging improvements:

  • When displaying stack traces (e. g. in console logs or even with the JavaScript debugger ), calls in order to framework methods are identified plus collapsed by default, making it easier to house in on your code.
  • In the same fashion as indigenous terminals, you can now use reverse lookup to find entries in your JavaScript gaming console history (F9 (Windows/Linux) or Ctrl + R (macOS) and kind a search term, followed by Ctrl + R/Ctrl + S to toggle through results).
  • The particular JavaScript console’ s $0 shortcut (references the currently inspected element within the page) now has autocomplete accessible, so for example you could type $0. te to get a suggestion of $0. textContent in order to reference text content.

Find out more

CSS platform improvements

Numerous CSS features have been added to Gecko in 65. The highlights are usually described below.

CSS environment variables

CSS environment variables are now supported, accessed through env() in stylesheets. These variables are usually usable in any part of a property worth or descriptor, and are scoped internationally to a particular document, whereas customized properties are scoped to the element(s) they are declared on. These were at first provided by the iOS browser to permit developers to place their content in the safe area of the viewport, i. electronic., away from the area covered by the step.

    env(safe-area-inset-top, 20px)
    env(safe-area-inset-right, 20px)
    env(safe-area-inset-bottom, 20px)
    env(safe-area-inset-left, 20px);

steps() computer animation timing function

We’ ve added the steps() CSS animation timing function , along with the related jump-* keywords. This allows you to definitely easily create animations that leap in a series of equidistant steps, rather than smooth animation.

For example, we might previously have added an easy animation to a DOM node such as this:

. smooth 
  animation: move-across 2s infinite alternate linear;

Now we are able to make the animation jump in five equal steps, like this:

. stepped 
  animation: move-across 2s infinite alternate steps(5, jump-end);

Note : The particular steps() function was previously called frames() , but some details transformed, and the CSS Working Group decided to rename it in order to something less confusing.

break-* properties

Brand new break-before , break-after , plus break-inside CSS attributes have been added, and the now-legacy page-break-* qualities have been aliased to them. These qualities are part of the CSS Fragmentation specification, and set how page, column, or even region breaks should behave just before, after, or inside a generated container.

For example , to stop a webpage break occurring inside a list or even paragraph:

 ol, ul, p 
  break-inside: avoid;


Opera 65 brings many updates in order to JavaScript/APIs.

Readable channels

Legible streams are now allowed by default, allowing developers to procedure data chunk by chunk since it arrives over the network, e. gary the gadget guy. from a fetch() request .

You can find a number of ReadableStream demos on GitHub .

Relative time types

The Intl. RelativeTimeFormat constructor allows you to result strings describing localized relative situations, for easier human-readable time recommendations in web apps.

A couple of examples, to sate your own appetite:

 allow rtf1 = new Intl. RelativeTimeFormat('en',  style: 'narrow'  );
console. log(rtf1. format(2, 'day')); // expected output: "in 2 days"

let rtf2 sama dengan new Intl. RelativeTimeFormat('es',  style: 'narrow'  );
console. log(rtf2. format(2, 'day')); // expected output: "dentro de two dí as" 

Storage Access API

The Storage space Access API continues to be enabled by default, providing a mechanism designed for embedded, cross-origin content to request entry to client-side storage mechanisms it would usually only have access to in a first-party framework. This API features a couple of easy methods, hasStorageAccess() plus requestStorageAccess() , which respectively check out and request storage access. For example:

 document. requestStorageAccess(). then(
() =>  console.log('access granted') ,
() =>  console.log('access denied') 

Other honorable mentions

  • The globalThis keyword has been additional, for getting at the global object within whatever context you are in. This particular avoids needing to use a mix of window , self , worldwide , or this particular , depending on where a script is definitely executing (e. g. a web page, a worker, or Node. js).
  • The FetchEvent object’ s replacesClientId and resultingClientId qualities are now implemented — allowing you to keep track of the origin and destination of a routing.
  • You can now set the referrer policy on scripts put on your documents (e. g. with a referrerpolicy attribute on < script> elements )
  • Lastly, to avoid popup spam, Window. open() may right now only be called once for each user interaction event.

Media: Support for WebP and AV1, and other improvements

At long last, Firefox 65 at this point supports the WebP image format . WebP offers both lossless and lossy compression modes, and typically generates files that are 25-34% smaller compared to equivalent JPEGs or PNGs with all the same image quality. Smaller documents mean faster page loads plus better performance, so this is obviously a very important thing.

Not all browsers assistance WebP. You can use the < picture> element within your HTML to offer both WebP plus traditional image formats, leaving the last choice to the user’ s internet browser. You can also detect WebP support to the server-side and serve images because appropriate, as supported browsers send out an Accept: image/webp header whenever requesting images.

Pictures are great, but what about video? Mozilla, along with industry partners, has been building the next-generation AV1 video codec , that is now supported in Firefox sixty-five for Windows. AV1 is nearly two times as efficient as H. 264 when it comes to compression, and, unlike H. 264, it’ s completely open plus royalty-free. Support for other systems will be enabled in future produces.

Other additions

  • The MediaRecorder pause plus resume events are finally supported within Firefox, as of version 65.
  • For developers creating WebGL content, Firefox 65 supports the particular BPTC and RGTC texture data compresion extensions.

Opera Internals

We’ ve also updated several aspects of Opera itself:

  • Assistance for Handoff between iOS plus macOS devices is now available.
  • Preferences for content preventing have been completely redesigned to give people greater and much more obvious control over how Firefox safeguards them from third-party tracking.
  • The regarding: performance dashboard right now reports the memory used by tab and extensions.
  • WebSockets have already been implemented over HTTP/2.
  • Lastly, for Windows administrators, Opera is now available as an MSI bundle in addition to a traditional self-extracting EXE.

WebExtensions improvements

We’ ve added a few useful WebExtensions API features as well!

  • The Tabs API now allows extensions to manage which tab gets focused once the current tab is closed. Read more about the motivation for this function on Piro’ s blog , where he talks about it in the context of their Tree Design Tab extension.


The web often contains conflicting, unique, or under-specified markup, and it’ s up to us to ensure that web pages which work in other browsers work in Firefox.

To that particular end, Firefox 65:

  • supports even more values from the non-standard -webkit-appearance CSS property.
  • behaves exactly like other browsers when encountering the particular user-select CSS home in nested, shadow, or articles editable contexts.
  • clears the content of < iframe> s when the src attribute is taken out, matching the behavior of Safari plus Chrome.

Additional Reading

Chris Mills is really a senior tech writer at Mozilla, where he writes docs and demonstrations about open web apps, HTML/CSS/JavaScript, A11y, WebAssembly, and more. He enjoys tinkering around with web technology, and gives occasional tech talks with conferences and universities. He utilized to work for Opera and W3C, plus enjoys playing heavy metal drums plus drinking good beer. He life near Manchester, UK, with his great lady and three beautiful kids.

More articles by Chris Mills…

Engineer along with Mozilla Developer Relations, former Mozilla Persona developer.

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