Why You Should be Using Web Components Right Now. And How. ForwardJS July 2015

Why you should be using Web Components Now.
And How.
PHIL @LEGGETTER
Head of Developer Relations
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What we'll cover
What are Web Components?
The State of Web Components
Componentised Web Apps Now
Why Web Components are the Future!
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Custom Elements
HTML Templates
Shadow DOM
HTML Imports
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Elements - Structure & Meaning
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>HTML Elements</title>
<meta name="description" content="" />
<link rel="stylesheet" href="css/stylez.css" />
</head>
<body>
<nav>
<ul>
<li><a href="#">Home</a></li>
</ul>
</nav>
<header>
<p>Hello world! This (part of) is HTML5 Boilerplate.</p>
</header>
<main>
<article>Ohhhh. Interesting</article>
</main>
<footer>© me</footer>
<script src="js/script.js"></script>
</body>
</html>
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<Custom Elements />
Bring semantic markup back
More than just markup
IMHO the most important part of Web Components
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Custom Elements: A new Gmail
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>A new Gmail?</title>
<meta name="description" content="">
</head>
<body>
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<!doctype html>
<html>
<head>
</head>
<body>
<header>
<img src="img/logo.png" alt="Google Logo" />
<gmail-search />
<gmail-account-strip />
</header>
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<!doctype html>
<html>
<head>
</head>
<body>
<header>
<gmail-search />
</header>
<gmail-side-bar>
<nav is="gmail-labels"></nav>
<gmail-contacts />
</gmail-sidebar>
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<!doctype html>
<html>
<head>
</head>
<body>
<header>
<gmail-search />
</header>
<gmail-side-bar>
<gmail-contacts />
</gmail-sidebar>
<main>
<nav is="gmail-categories"></nav>
<gmail-email-list />
</main>
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<!doctype html>
<html>
<head>
</head>
<body>
<header>
<gmail-search />
</header>
<gmail-side-bar>
<gmail-contacts />
</gmail-sidebar>
<main>
</main>
<hangouts />
</body>
</html>
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Tools, Tips & Tricks for building
Componentised Web Apps
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<img src="http://avatars.io/twitter/leggetter" />
<img src="http://avatars.io/instagram/leggetter" />
<img src="http://avatars.io/gravatar/phil@pusher.com" />
<img src="http://api.skype.com/users/pleggetter/profile/avatar" />
Start Simple - An Avatar
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Custom Elements
<my-avatar service="twitter" username="leggetter" />
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Custom Elements
<script>
var MyAvatarPrototype = Object.create(HTMLElement.prototype);
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Custom Elements
<script>
MyAvatarPrototype.createdCallback = function() {
var username = this.getAttribute('username');
var service = this.getAttribute('service');
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Custom Elements
<script>
var url = 'http://avatars.io/' + service + '/' + username;
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Custom Elements
<script>
var img = document.createElement( 'img' );
img.setAttribute('src', url);
this.appendChild(img);
};
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Custom Elements
<script>
var img = document.createElement( 'img' );
img.setAttribute('src', url);
this.appendChild(img);
};
document.registerElement('my-avatar', {
prototype: MyAvatarPrototype
});
</script>
Define your own elements. 25 / 157

<my-avatar service="instagram" username="leggetter" />
<my-avatar service="twitter" username="forwardjs" />
<my-avatar />
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Custom Elements - Extending
<img is="my-avatar-ext" service="twitter" username="leggetter" />
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Custom Elements - Lifecycle
createdCallback
attachedCallback
detachedCallback
attributeChangedCallback(attrName, oldVal,
newVal)
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Create Elements using JavaScript
<script>
function createPhils() {
var tooManyPhils = 104;
var phils = 0;
do {
var el = document.createElement( 'my-avatar' );
el.setAttribute('service', 'twitter');
el.setAttribute('username', 'leggetter');
document.getElementById( 'phils' ).appendChild( el );
++phils;
} while( phils < tooManyPhils );
}
</script>
Create Phils
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Templates
Native HTML Templating Support
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HTML Templates Create Avatar
<template id="my-avatar-template">
<style>
.container { background-color: gold; }

</style>
<div class="container">
<img class="avatar" />
<span class="username"></span>
<span class="service"></span>
</div>
</template>
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Why native HTML Templates?
Libraries → Native
Native benefits
Document fragment = lightweight
Inert until cloned/used
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Shadow DOM
DOM/CSS "scoping" / protection
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Shadow DOM - Already using it
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Shadow DOM - Problems it solves
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Styles <span class="container">Bleed!</span>
<template id="my-avatar-tmpl">
<style>
.container { background-color: cyan; }
...
<my-avatar-tmpl service="twitter" username="leggetter" />
Styles Bleed! Create
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Styles <span class="container">Bleed!</span>
<template id="my-avatar-tmpl">
<style>
.container { background-color: cyan; }
...
<my-avatar-tmpl service="twitter" username="leggetter" />
Styles Bleed! Create
<img id="avatar" />
...
</template>
Global DOM
e.g. id attributes
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Shadow DOM - In Action Create ForwardJS
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<template id="my-avatar-shadow-tmpl">
<style>
.container { background-color: red; color: white; }
...
</style>
<img id="avatar" />
...
</div>
</template>
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Why Shadow DOM?
DOM & CSS Scoping
Protection for all: Page and Element
Encapsulation
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HTML Imports
Loading & Dependency Management
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HTML Imports - Example
Before
<link rel="stylesheet" href="bootstrap.css" />
<link rel="stylesheet" href="fonts.css" />
<script src="jquery.js"></script>
<script src="bootstrap.js"></script>
<script src="bootstrap-tooltip.js"></script>
<script src="bootstrap-dropdown.js"></script>
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HTML Imports - Example
Before
<link rel="stylesheet" href="bootstrap.css" />
<link rel="stylesheet" href="fonts.css" />
<script src="jquery.js"></script>
<script src="bootstrap.js"></script>
<script src="bootstrap-tooltip.js"></script>
<script src="bootstrap-dropdown.js"></script>
After
<link rel="import" href="bootstrap.html" />
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HTML Imports - Composition
team-pusher.html
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team-pusher.html
<link rel="import" href="my-avatar-import.html" />
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team-pusher.html
<template id="team-pusher-tmpl">
<style> </style>
<my-avatar-import service="twitter" username="maxthelion" />
<my-avatar-import service="twitter" username="copypastaa" />
...
<my-avatar-import service="twitter" username="leggetter" />
</template>
...
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team-pusher.html
<template id="team-pusher-tmpl">
<style> </style>
<my-avatar-import service="twitter" username="maxthelion" />
<my-avatar-import service="twitter" username="copypastaa" />
...
<my-avatar-import service="twitter" username="leggetter" />
</template>
<script>
var TeamPusherPrototype = Object.create(HTMLElement.prototype);
TeamPusherPrototype.createdCallback = function() {
// Get template, createShadowRoot etc.
};
document.registerElement('team-pusher', {
prototype: TeamPusherPrototype
});
</script>
...
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HTML Imports - Composition Demo
<link rel="import" href="assets/team-pusher.html" />
<team-pusher></team-pusher>
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HTML Imports - Composition Demo
<link rel="import" href="assets/team-pusher.html" />
<team-pusher></team-pusher>
maxthelion
twitter
copypastaa
twitter
zimbatm
twitter
loicdumas
twitter
mdpye
twitter
olga_dukova
twitter
pawel_ledwon
twitter
hamchapman
twitter
LaurieWang_
twitter
swstagg
twitter
vivangkumar
twitter
willsewell_
twitter
davidrbiggs
twitter
leggetter
twitter
We're Hiring! pusher.com/jobs
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Why Use HTML Imports?
Bundle JS/HTML/CSS → single URL
Basic dependency management
Sharing, Reuse, Composition
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Get & use document from the currentScript
( function( currentScript ) {
var importDoc = currentScript.ownerDocument;
TeamPusherPrototype.createdCallback = function() {
var content = importDoc.querySelector( '#team-pusher-tmpl' ).content;
// ...
};
} )( document._currentScript || document.currentScript );
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importNode and NOT cloneNode for Template
// Note: use ownerDoc
var content = ownerDoc.querySelector( '#my-template' );
var clone = ownerDoc.importNode( content, true );
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You can't <link> into the Shadow DOM
<template>
<link rel="stylesheet" href="path/to/style.css" />
</template>
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The State of Custom Elements
is
Concerns around Accessibility
Point of Upgrade
When HTMLElement is transformed into Custom Element
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The State of Templates ✔
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The State of Shadow DOM
<content select="tag" />
Declarative element content placement
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element.createShadowRoot({ mode:
'closed' });
protecting shadowRoot
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element.createShadowRoot({ mode:
'closed' });
protecting shadowRoot
.foo >>> div { color: red }
Shadow piercing combinators
...
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The State of HTML Imports
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Firefox
https://hacks.mozilla.org/2014/12/mozilla-and-web-components/
“Mozilla will not ship an implementation of
HTML Imports. We expect that once JavaScript
modules ... is shipped, the way we look at this
problem will have changed.
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Essential "State of" Reading
Wilson Page - The State of Web Components
Microsoft Edge Team - Bringing componentization to the web: An
overview of Web Components
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The State of Browsers
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Apple's updated feedback on Custom Elements and Shadow DOM
From: Maciej Stachowiak <mjs@apple.com>
Date: Mon, 20 Jul 2015 18:17:24 -0700
Message-id: <E9841AA1-9255-4324-946E-E785B15DAE93@apple.com>
To: public-webapps <public-webapps@w3.org>
A while back we sent a consolidated pile of feedback on the Web Components family of specs. In preparation for tomorrow's F2F, here is an update on
our positions. We've also changed the bugzilla links to point to relevant github issues instead.
We're only covering Custom Elements (the main expected topic), and also Shadow DOM (in case that gets discussed too).
I. ==== Custom Elements ====
A. ES6 classes / Upgrade / Synchronous Constructors
1. In general, we support the "synchronous constructors" approach to the "prototype swizzling" approach, as the lesser evil. While
tricky to implement correctly, it makes a lot more sense and fits more naturally into the language. We are willing to do the work to make it
feasible.
2. Custom elements should support initialization using an ES6 class constructo instead of a separate callback.
<https://github.com/w3c/webcomponents/issues/139 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=28541>>
3. We don’t think upgrading should be supported. The tradeoffs of different options have been much-discussed.
<https://github.com/w3c/webcomponents/issues/134 <https://www.w3.org/Bugs/Public/show_bug.cgi?id=28544>>
4. Specifically, we don't really like the "Optional Upgrades, Optional Constructors" proposal (seems like it's the worst of both
worlds in terms of complexity and weirdness) or the "Parser-Created Classes" proposal (not clear how this even solves the problem).
B. Insertion/Removal Callbacks
1. We think the current attached/detached callbacks should be removed. They don’t match core DOM concepts and insert/remove is a
more natural bracket. The primitives should be insertedIntoDocument / removedFromDocument and inserted / removed. If you care about whether your
document is rendered, look at its defaultView property. <https://github.com/w3c/webcomponents/issues/286>
2. We think inserted/removed callbacks should be added, for alignment with DOM. <https://github.com/w3c/webcomponents/issues/222>
C. Inheritance for Built-ins
1. We think support for inheritance from built-in elements (other than HTMLElement/SVGElement) should be omitted from a cross-
browser v1. It raises complex implementation issues. <https://github.com/w3c/webcomponents/issues/133 <https://www.w3.org/Bugs/Public/show_bug.cgi?
id=28547>>
D. Syntactic Sugar / Developer Ergonomics
1. We think it would be useful (perhaps post-v1) to make it simpler to create a custom element that is always instantiated with a
shadow DOM from a template. Right now, this common use case requires script and a template in separate places, and a few lines of confusing
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Safari

Can I use ? Settingsweb components
4 results found
# Global 67.55%
U.K. 70.69%
IE / Edge Firefox Chrome Safari Opera iOS Safari
*
Opera Mini
* Android
Browser
* Chrome for
Android
8
9
10
11
Edge
31
38
39
40
41
42
31
36
37
39
40
42
43
44
45
46
47
7
7.1
8
9
30
31
32
7.1
8.4
9
8
4.1
4.3
4.4
4.4.4
40 42
HTML templates - LS
Method of declaring a portion of reusable markup that is parsed
but not rendered until cloned.
Current aligned Usage relative Show all
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State of Browser Support

Browsers - with Polyfills
https://github.com/webcomponents/webcomponentsjs#browser-support
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Componentised Web Apps Now
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Christian Heilmann - July 1st, 2015
‘When we asked the very captive and elite
audience of EdgeConf about Web Components,
nobody raised their hand that they are using them
in real products.
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Componentised Web Apps Now -
questions?
Should native browser support stop us thinking about building componentised
web apps?
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questions?
web apps?
No!
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questions?
web apps?
No!
Should we be build componentised web apps anyway?
87 / 157

questions?
web apps?
No!
Should we be build componentised web apps anyway?
We're already building web apps out of components right now!
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JavaScript
Libraries & Frameworks
89 / 157

AngularJS
<script src="js/angular.min.js"></script>
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AngularJS
<script>
angular.module('demo', [])
.directive('ngAvatar', function () {
return {
92 / 157

AngularJS
<script>
return {
restrict:"AEC",
93 / 157

AngularJS
<script>
return {
restrict:"AEC",
scope: {
service: '@',
username: '@'
},
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AngularJS
<script>
return {
restrict:"AEC",
scope: {
service: '@',
username: '@'
},
template: '<img src="http://avatars.io/' +
'{{service}}/{{username}}" />'
};
});
</script>
<body ng-app="demo">
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AngularJS
<script>
return {
restrict:"AEC",
scope: {
service: '@',
username: '@'
},
};
});
</script>
<ng-avatar service="twitter" username="leggetter" />
96 / 157

AngularJS
<script>
return {
restrict:"AEC",
scope: {
service: '@',
username: '@'
},
};
});
</script>
97 / 157

EmberJS
<script src="js/jquery-1.10.0.min.js"></script>
99 / 157

EmberJS
<script src="js/handlebars.js"></script>
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EmberJS
<script src="js/ember.js"></script>
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EmberJS
<script>
var App = Ember.Application.create();
App.EmAvatarComponent = Ember.Component.extend({
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EmberJS
<script>
url: function () {
return 'http://avatars.io/' +
this.get( 'service' ) + '/' +
this.get( 'username' );
}.property( 'username' , 'service' )
});
</script>
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EmberJS
<script>
url: function () {
});
</script>
<script type="text/x-handlebars" id="components/em-avatar">
<img {{bind-attr src=url}} />
</script>
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EmberJS
<script>
url: function () {
});
</script>
<script type="text/x-handlebars" id="components/em-avatar">
<img {{bind-attr src=url}} />
</script>
<script type="text/x-handlebars">
{{em-avatar service="twitter" username="leggetter"}}
</script>
http://jsbin.com/fexawujibe/2/edit?html,output
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ReactJS
<script src="js/react.js"></script>
<script src="js/JSXTransformer.js"></script>
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ReactJS
<script type="text/jsx">
var ReAvatar = React.createClass({
render: function() {
return (
<img src={"http://avatars.io/" +
this.props.service + "/" +
this.props.username} />
);
}
});
108 / 157

ReactJS
return (
);
}
});
React.render(
<ReAvatar service="twitter" username="leggetter" />,
document.querySelector('re-avatar')
);
</script>
109 / 157

ReactJS
return (
);
}
});
React.render(
);
</script>
<re-avatar />
110 / 157

ReactJS
return (
);
}
});
React.render(
);
</script>
<re-avatar />
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Polymer
<script src="webcomponentsjs/webcomponents.min.js"></script>
<link rel="import" href="polymer/polymer.html">
113 / 157

Polymer
<polymer-element name="po-avatar" attributes="service username">
114 / 157

Polymer
<template>
<img src="http://avatars.io/{{service}}/{{username}}" />
</template>
115 / 157

Polymer
<template>
</template>
<script>
Polymer('po-avatar', {});
</script>
</polymer-element>
116 / 157

Polymer
<template>
</template>
<script>
</script>
</polymer-element>
<po-avatar service="twitter" username="leggetter" />
117 / 157

Polymer
<template>
</template>
<script>
</script>
</polymer-element>
<po-avatar service="twitter" username="leggetter" />
118 / 157

Who's using? ...
Angular Directives
119 / 157

Who's using? ...
Angular Directives
Ember Components
120 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
121 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
KnockoutJS Components
122 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
Vue.js Components
123 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
Vue.js Components
Backbone Components
124 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
Vue.js Components
Backbone Components
CanJS Components
125 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
Vue.js Components
Backbone Components
CanJS Components
Famous Components
126 / 157

Who's using? ...
Angular Directives
Ember Components
React Components
Vue.js Components
Backbone Components
CanJS Components
Famous Components
Anything.JS Components?
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Who's Building Componentised Web Apps now?
Angular, Ember, Backbone, Knockout, React, Vue.js, Web Components with Polyfills, Polymer
...
128 / 157

...
You are!
vs.
129 / 157

...
You are!
vs.
That's the HOW
130 / 157

Why Web Components are the future!
131 / 157

1. You're already building componentised
web apps
If you're not, you probably should be
132 / 157

Libraries
Alignment toward Web Components
Angular - Directives
Ember - Components
Knockout - Components
Polymer - build upon Web Components
Angular 2...
134 / 157

http://guides.emberjs.com/v1.13.0/components/
‘Ember's implementation of components hews as
closely to the Web Components specification as
possible. Once Custom Elements are widely
available in browsers, you should be able to easily
migrate your Ember components to the W3C
standard and have them be usable by other
frameworks.
135 / 157

Have a Strategy
Will libraries update to use Web Components?
Align with Web Components to make migrating easier
Split UI rendering and business logic
137 / 157

Browser Vendor Support
Google ✔
Opera ✔
Mozilla ✔
Microsoft ✔
Apple ✔
138 / 157

Dashboard Get Started Design Develop Publish Community WPDev Feedback
Microsoft Edge Developer
Welcome to the Microsoft Edge Developer Suggestion Box!
The Microsoft Edge team is looking for feature requests from the web developer and designer community. Categories
include (but certainly are not limited to) HTML, CSS, JavaScript, Performance, and Developer Tools. If you do not have
a suggestion at this time, you may still cast your vote for the features you would like to see supported!
This feedback will help us with planning and to better understand how web developers and designers are using the
platform. Top standards-based feature requests will also be copied over to http://dev.modern.ie/platform/status/, where
you can track its development status.
Note that this forum is intended for web platform feature suggestions. Related feedback channels:
Microsoft Edge application feedback (or use the Windows Feedback app in Windows Technical Preview)
Microsoft Edge feedback on Windows Phone
For specific bugs, please log an issue on the Connect site
Finally – a few guidelines and notes to keep things running smoothly:
1. Please be sure to search for ideas before entering a new suggestion. This helps to accrue the votes correctly.
2. Please enter a separate suggestion for each idea (avoid entering a suggestion with multiple ideas) and share
some information if possible on the most important scenarios that this enables for you. This helps to keep things
clear as to what people are voting for.
3. The items and rankings on this site are an important input, but do not reflect the final priority list for the Microsoft
Edge engineering team.
4. We will moderate suggestions made in the forum if they do not represent an actual feature request or are
inappropriate.
5. Please do not send any novel or patentable ideas, copyrighted materials, samples or demos which you do not
want to grant a license to Microsoft. See the Terms of Service for more information.
Microsoft Edge Developer
Post a new idea…
All ideas
My feedback
Accessibility 4
CSS 59
Document Object Model (DOM) 7
Extensions 12
F12 Developer Tools 119
Graphics 21
HTML 49
JavaScript 61
Media 14
Miscellaneous 45
Networking 22
Performance 17
Security 1
New and returning users may sign in
Search 139 / 157
3. Demand

4. Encourages good software
development
Component-based Development
140 / 157

Separation of Concerns
<!doctype html>
<html>
<head>
</head>
<body>
<header>
<gmail-search />
</header>
<gmail-side-bar>
<gmail-contacts />
</gmail-sidebar>
<main>
</main>
<hangouts />
</body>
</html>
141 / 157

Encapsulation
Shadow DOM - Style & DOM encapsulation
Does NOT offer JavaScript protection
Hacky Custom Element
leggetter
twitter
Don't click me!
142 / 157

Loose Coupling
Custom Events
Element API (interface)
Or use existing messaging frameworks
143 / 157

Custom Events
<script>
var CustomEventPrototype = Object.create(HTMLElement.prototype);
CustomEventPrototype.createdCallback = function() {
// Build element ...
this.addEventListener('click', function() {
var customEvent = new CustomEvent('cheese');
this.dispatchEvent(customEvent);
}.bind(this));
};
// ...
144 / 157

Custom Events
<script>
var CustomEventPrototype = Object.create(HTMLElement.prototype);
CustomEventPrototype.createdCallback = function() {
// Build element ...
this.addEventListener('click', function() {
var customEvent = new CustomEvent('cheese');
this.dispatchEvent(customEvent);
}.bind(this));
};
// ...
var customEl = document.getElementById('my_custom_ev');
customEl.addEventListener('cheese', function() {
alert('cheese fired!');
});
</script>
<custom-event-ex id="my_custom_ev"></custom-event-ex>
145 / 157

Element API Attributes & Methods
<script>
CustomEventPrototype.startSpin = function() {
this.img.classList.toggle('spin');
};
CustomEventPrototype.stopSpin = function() {
this.img.classList.toggle('spin');
};
// ...
var spinEl = document.getElementById('spin_el');
spinEl.startSpin();
// ...
spinEl.stopSpin();
</script>
<custom-event-ex id="spin_el"></custom-event-ex>
146 / 157

Supports Change
Encapsulation
Loose Coupling
147 / 157

Encourage Reuse
Ease of Sharing
Composition
<link rel="import" href="https://some-cdn.com/my-avatar.html" />
148 / 157

High Cohesion
myavatar.html
├── js/script.js
├── css/styles.css
└── img/bg.png
149 / 157

Problems? Solved in the future?
HTML Imports
Vulcanize | HTTP2 | JavaScript modules
Shared scripts?
Cache
Multiple versions?
JavaScript scoping in v2
Better cross-component communication?
Allow <link> for CSS in Shadow DOM?
150 / 157

Summary
Custom Elements - Awesome
151 / 157

Summary
HTML Templates, Shadow DOM, HTML Imports
- Native FTW
152 / 157

Summary
- Native FTW
You can & are building componentised web
apps now - Align
153 / 157

Summary
- Native FTW
apps now - Align
Trends & "best practice" ♥ Web Components
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Summary
- Native FTW
apps now - Align
Trends & "best practice" ♥ Web Components
Web Components are the future!
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Resources
http://webcomponents.org/
https://www.polymer-project.org
Wilson Page - The State of Web Components
Christian Heilmann - Web Components are an Endangered Species
Are we compontentized yet (podcast)
Eric Bidelman's Google IO 2014 talk
Angular Material
Google Material Design
HTML Template Chooser
IE UserVoice forum
Source for these slides
http://pusher.com - easily add realtime messaging to your apps
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Why you should be using Web Components Now.
And How.
Questions?
leggetter.github.io/web-components-now
PHIL @LEGGETTER
Head of Developer Relations
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Why You Should be Using Web Components Right Now. And How. ForwardJS July 2015

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Why You Should be Using Web Components Right Now. And How. ForwardJS July 2015