Opera 63 – Tricks and Goodies!

It’ s that time of the yr again- when we put on costumes plus pass out goodies to all. It’ t Firefox release week! Join me personally for a spook-tacular 1 look into the latest goodies shipping this launch.

Web Components, Oh yea My!

After a rather long pregnancy , I’ m pleased to mention that support for modern Internet Components APIs has shipped within Firefox! Expect a more thorough posting, but let’ s cover exactly what these new APIs make feasible.

Custom Elements

To put it simply, Custom Elements means that we can define new HTML tags outside of the standard set included in the web system. It does this by letting JS classes extend the built-in HTMLElement item, adding an API for signing up new elements, and by adding particular “ lifecycle” methods to detect each time a custom element is appended, eliminated, or attributes are updated:

  class FancyList extends HTMLElement 
  constructor () 
    this.style.fontFamily = 'cursive'; // very fancy
    console.log('Make Way!');
    console.log('I Bid You Adieu.');

customElements. define('fancy-list', FancyList);

Darkness DOM

The web provides long had reusable widgets individuals can use when building a site. Probably the most common challenges when using third-party icons on a page is making sure that the particular styles of the page don’ to mess up the appearance of the widget plus vice-versa. This can be frustrating (to place it mildly), and leads to lots of lengthy, overly specific CSS selectors, or maybe the use of complex third-party tools in order to re-write all the styles on the web page to not conflict.

Cue frustrated developer:

There has to be a much better way…

Today, there is!

The Shadow DOM is not a secretive subterranean society of web developers, but instead the foundational web technology that allows developers create encapsulated HTML trees and shrubs that aren’ t affected by outdoors styles, can have their own styles that will don’ t leak out, and fact can be made unreachable through normal DOM traversal methods ( querySelector , . childNodes , etc . ).

 let darkness = div. attachShadow(  mode: 'open'  );
let inner = document. createElement('b');
inner. appendChild(document. createTextNode('I was born within the shadows'));
shadow. appendChild(inner);
div. querySelector('b'); // empty

Custom elements and shadow root base can be used independently of one another, however they really shine when used with each other. For instance, imagine you have a < media-player> component with playback controls. You can place the controls in a shadow root and maintain the page’ s DOM thoroughly clean! In fact , Both Firefox and Stainless- now use Shadow DOM for your implementation of the < video> element.

Expect a deeper jump on building full-fledged components right here on Hacks soon! In the meantime, you are able to plunge into the Web Components docs on MDN as well as see the program code for a bunch of sample custom elements on GitHub .

Fonts Publisher

a screenshot of the fonts panel being utilized to adjust a variable font

The Inspector’ s Fonts panel is a convenient way to see what local plus web fonts are being used on a webpage. Already useful for debugging webfonts, within Firefox 63 the Fonts section gains new powers! You can adapt the parameters of the font for the currently selected element, and if the existing font supports Font Variations, you will see and fine-tune those paramaters too. The syntax for adjusting adjustable fonts can be a little unfamiliar and it’ s not otherwise possible to find out all the variations built into a typeface, so this tool can be a life saver.

Read all about how to use the particular new Fonts panel on MDN Web Documents .

Reduced movement preferences for CSS

Slick animations can give a refined and unique feel to an electronic experience. However , for some people, animated results like parallax and sliding/zooming changes can cause vertigo and headaches. Additionally , some older/less powerful devices may struggle to render animations smoothly. To reply to this, some devices and systems offer a “ reduce motion” choice. In Firefox 63, you can now identify this preference using CSS media queries and adjust/reduce your usage of transitions and animations to ensure a lot more people have a pleasant experience using your web site. CSS Tricks has a great overview of both how to detect decreased motion and why you should care.


There is certainly, as always, a bunch more in this discharge of Firefox. MDN Web Docs has the full run-down of developer-facing changes, and more highlights can be found in the particular official specifications . Happy Browsing!

1 . not particularly spook-tacular

Potch is a Web System Advocate at Mozilla.

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