Tags: webcomponents

31

sparkline

Web Components in 2018 - Blog | SitePen

A good explanation of web components, complete with some code examples.

Web Components are not a single technology. Instead, they are series of browser standards defined by the W3C allowing developers to build components in a way the browser can natively understand. These standards include:

  • HTML Templates and Slots – Reusable HTML markup with entry points for user-specific markup
  • Shadow DOM – DOM encapsulation for markup and styles
  • Custom Elements – Defining named custom HTML elements with specific behaviour

Web Components Club – A journal about learning web components

Andy Bell is documenting is journey of getting to grips with web components. I think it’s so valuable to share like this as you’re learning, instead of waiting until you’ve learned it all—the fresh perspective is so useful!

Bad Month for the Main Thread - daverupert.com

JavaScript is CPU intensive and the CPU is the bottleneck for performance.

I’m on Team Dave.

But darn it all, I just want to build modular websites using HTML and a little bit of JavaScript.

Raindrops on roses, whiskers on kittens, declarative web APIs and truly serverless web endpoints

Three technologies that Ada is excited about:

  1. a service: IndieAuth,
  2. a front end library: Comlink,
  3. a pattern: APIs as Web Components.

i is=”the walrus”

In which Brian takes a long winding route through an explanation of why the is attribute for custom elements is dead before he demonstrates the correct way to use web components:

<!-- instead of writing this -->
<input type="radio" is="x-radio">

<!-- you write this -->
<x-radio>
<input type="radio">
</x-radio>

Sadly, none of the showcase examples I’ve seen for web components do this.

Jeremy Keith on Evaluating Technology at SmashingConf Barcelona 2017 on Vimeo

I think this is the best delivery of this talk I’ve ever given. It was something about being in that wonderful venue.

I got quite worked up around the the 32 minute mark.

Jeremy Keith on Evaluating Technology at SmashingConf Barcelona 2017

Collapsible Sections

The latest edition of Heydon’s Inclusive Components is absolutely fantastic! The pattern itself—toggling sections of content—is quite straightforward, but then there’s a masterclass in how to create a web component that still allows the content to be accessible in older browsers. The key, as ever, is progressive enhancement:

Whether implemented through web components or not, progressive enhancement not only ensures the interface is well-structured and robust. As we’ve seen here, it can also simplify the editorial process. This makes developing the application and its content more inclusive.

Mozilla Developer Roadshow Asia Jeremy Keith - YouTube

At the 14 minute mark I had to deal with an obstreperous member of the audience. He wasn’t heckling exactly …he just had a very bad experience with web components, and I think my talk was triggering for him.

Mozilla Developer Roadshow Asia: Jeremy Keith

Web Components: The Long Game – Infrequently Noted

One of the things we’d hoped to enable via Web Components was a return to ctrl-r web development. At some level of complexity and scale we all need tools to help cope with code size, application structure, and more. But the tender, loving maintainance of babel and webpack and NPM configurations that represents a huge part of “front end development” today seems…punitive. None of this should be necessary when developing one (or a few) components and composing things shouldn’t be this hard. The sophistication of the tools needs to get back to being proportional with the complexity of the problem at hand.

I completely agree with Alex here. But that’s also why I was surprised and disheartened when I linked to Monica’s excellent introduction to web components that a package manager seemed to be a minimum requirement.

Shadow DOM: fast and encapsulated styles – Monica Dinculescu

Monica explains how Shadow DOM could be the perfect answer for scoping CSS:

We didn’t have style encapsulation, so we started naming things “the right way” with BEM, so that we didn’t accidentally stomp over each other’s styles. We wanted to be able to author CSS from inside a JavaScript component, so we started using CSS-in-JS. We needed all these tools, because “the platform” (read: the browsers that be) wasn’t there, and building these tools showed that there was a need to move forward. For style encapsulation, Shadow DOM is the platform moving forward.

Although, in a way, Shadow DOM is also another flavour of CSS-in-JS:

Before you complain that using a Shadow DOM and Web Components means that it absolutely requires JavaScript: this is true.

Jekyll Includes are Cool - daverupert.com

Dave explains how Jekyll Includes are starting to convert him to web components. The encapsulation is nice and neat. And he answers the inevitable “but why not use React?” question:

Writing HTML that contains JavaScript, not JavaScript that contains HTML, feels good to me.

The key feature for me is that this approach doesn’t have to depend on JavaScript in the browser:

I like that Web Components are an entirely client-side technology but can be rendered server-side in existing tech stacks whether it’s Jekyll, Rails, or even some Enterprise Java system.

An intro to web components with otters – Monica Dinculescu

A really great introduction to web components by Monica. But I couldn’t help but be disheartened by this:

Web components tend to have dependencies on other web components, so you need a package manager to herd all them cats.

For me, this kind of interdependence lessens the standalone nature of web components—it just doesn’t feel quite so encapsulated to me. I know that this can be solved with build tools, but now you’ve got two problems (and one more dependency).

Custom Elements: an ecosystem still being worked out - Tales of a Developer Advocate

Really, really smart thinking from Paul here, musing on the power relationship between the creators of custom elements and the users of custom elements.

Create a MarkDown tag - JSFiddle

This is nice example of a web component that degrades gracefully—if custom elements aren’t supported, you still get the markdown content, just not converted to HTML.

<ah-markdown>
## Render some markdown!
</ah-markdown>

The Web Platform Podcast : 111 Extensible Web Components on Huffduffer

I spoke my brains in this podcast episode, all about web components, progressive enhancement and backwards compatibility.

Shadow DOM v1: self-contained web components | Web Fundamentals - Google Developers

An in-depth look at the current Shadow DOM spec. It’s well-written but I don’t think this will really click with me until I start playing around with it for myself.

It’s good to see that the examples have some thought given to fallback content.

There’s also a corresponding tutorial on custom elements

Web Components and progressive enhancement - Adam Onishi

Adam and I share the same hopes and frustrations with web components. They can be written in a resilient, layered way that allows for progressive enhancement, but just about every example out there demonstrates a “my way or the highway” approach to using them.

We were chatting about this in the Design Systems slack channel, and it helped clarify some of my thoughts. I’ll try to poop out a blog post about this soon.

shawnbot/custom-elements: All about HTML Custom Elements

A good introduction to custom elements, one piece of the web components stack.

That said, when using custom elements—or anything involving JavaScript, for that matter—you should always design experiences for progressive enhancement, and plan for the possibility that JavaScript isn’t enabled or available.

Hmmm …that’s kind of hard when JavaScript is required to make custom elements work at all.

How Will Web Components Change CSS Architecture? - Snook.ca

Depending on how you’re currently structuring your CSS and class attributes, web components might not make all that much of a difference to your workflow.

Practical Questions around Web Components - Ian Feather

An in-depth look at where web components stand today, together with some very good questions about where they might be heading tomorrow.