Tags: frame



Sunday, May 17th, 2020

Write Libraries, Not Frameworks by Brandon Smith

This is a very clear description of the differences between libraries and frameworks, along with the strengths and weaknesses of both.

A library is a set of building blocks that may share a common theme or work well together, but are largely independent.

A framework is a context in which someone writes their own code.

I very much agree with the conclusion:

If your framework can be a library without losing much, it probably should be.

Wednesday, May 13th, 2020


This micro libarary does DOM diffing in native JavaScript:

Reef is an anti-framework.

It does a lot less than the big guys like React and Vue. It doesn’t have a Virtual DOM. It doesn’t require you to learn a custom templating syntax. It doesn’t provide a bunch of custom methods.

Reef does just one thing: render UI.

Monday, May 11th, 2020

Second-guessing the modern web - macwright.org

I’m at the point where you look at where the field is and what the alternatives are – taking a second look at unloved, unpopular, uncool things like Django, Rails, Laravel – and think what the heck is happening. We’re layering optimizations upon optimizations in order to get the SPA-like pattern to fit every use case, and I’m not sure that it is, well, worth it.

Spot-on analysis of what React is and isn’t good for. And lest you think this is blasphemy, Dan Abramov agrees.

Tuesday, April 28th, 2020

Principles and priorities | Hacker News

I see that someone dropped one of my grenades into the toilet bowl of Hacker News.

Monday, April 27th, 2020

Gardened. — Ethan Marcotte

The cost of “modern” web development:

We’re dealing with the results of bad defaults, deployed at a terrible scale.

Frankly, it’s hard for me not to see this as a failure of governance. Our industry is, by and large, self-regulated. And right now, producing quality work relies on teams electing to adopt best practices.

Hard agree. Companies are prioritising speed of development over user experience. The tragic part is that those two things needn’t necessarily conflict …but in the most popular of today’s JavaScript frameworks, they very much do.

Looking at coronavirus.data.gov.uk - Matthew Somerville

I worry that more and more nowadays, people jump to JavaScript frameworks because that is what they know or have been taught, even though they are entirely inappropriate for a wide array of things and can often produce poor results.

Last week I wrote about the great work that Matthew did and now he’s written up his process:

The important thing is to have a resilient base layer of HTML and CSS, and then to enhance that with JavaScript.

Thursday, April 23rd, 2020


It’s been fascinating to see how television programmes have adapted to The Situation. It’s like there’s been a weird inversion with the YouTube asthetic. Instead of YouTubers doing their utmost to emulate the look of professional television, now everyone on professional television looks like a YouTuber.

No more lighting or audio technicians. No more studio audiences. Heck, no more studios.

There are some kinds of TV programmes that are showing the strain. A lot of comedy formats just fall flat without the usual production values. But a lot of programmes work just fine. In fact, some of them might be better. Watching Mary Beard present Front Row Late from her house is an absolute delight. It feels more direct and honest without the artiface of a television studio. It kind of makes you wonder whether expensive production costs are really necessary when what you really care about is the content.

All of this is one big belaboured metaphor for websites.

In times of crisis, informational websites sometimes offer a “lite” version. Max has even made an emergency website kit:

The site contains only the bare minimum - no webfonts, no tracking, no unnecessary images. The entire thing should fit in a single HTTP request. It’s basically just a small, ultra-lean blog focused on maximum resilience and accessibility. The Service Worker takes it a step further from there so if you’ve visited the site once, the information is still accessible even if you lose network coverage.

Eric emphasises the importance of performance in his post Get Static:

I’m thinking here of sites for places like health departments (and pretty much all government services), hospitals and clinics, utility services, food delivery and ordering, and I’m sure there are more that haven’t occurred to me.  As much as you possibly can, get it down to static HTML and CSS and maybe a tiny bit of enhancing JS, and pare away every byte you can.

Tom Loosemore offers this advice to teams building new coronavirus services:

  1. Get a 4 year-old Android phone, and use it as your test/demo device.
  2. https://design-system.service.gov.uk is your friend.
  3. Full React isn’t your friend if it makes your service slow & inaccessible

Remember: This is for everyone.

Indeed, Gov.uk are usually a paragon of best practices in just about any situation. But they dropped the ball recently, as Matthew attests:

coronavirus.data.gov.uk is a static site, fetching and displaying remote data. It is also a 100% client-side JavaScript React site.

http://dracos.co.uk/made/coronavirus.data.gov.uk/ is 238K vs 770K (basics) on load. I’ve removed about 550K of JavaScript. It seems to work the same.

As Tom says:

One sign that your website isn’t meeting the needs of all your users is when Matthew Somerville gets sufficiently grumpy about it to do a proper version himself.

It’s true enough that Matthew excels at creating lightweight, accessible versions of services that are too bloated or buggy to use. His accessible Odeon project from back in the day is legendary. And I use his slimline version of the National Rail website all the time: traintimes.org.uk—it’s a terrificly performant progressive web app.

It’s thankless work though. It flies in the face of everything considered “modern” web development. (If you want to know the cost of “modern” framework-driven JavaScript-first web development, Tim has the numbers.) But Matthew is kind of a hero to me. I wish more developers would follow his example.

Maybe now, with this rush to make lightweight versions of valuable services, we might stop and reflect on whether we ever really needed all those added extras in the first place.

Hope springs eternal.

Update: Matthew has written about his process in Looking at coronavirus.data.gov.uk.

The Cost of Javascript Frameworks - Web Performance Consulting | TimKadlec.com

Excellent in-depth research by Tim on how the major frameworks affect performance. There are some surprising (and some unsurprising) findings in here.

I wish with all my heart that this data would have some effect but I fear there’s an entire culture of “modern” web development that stick its fingers in its ears and say “La, la, la, I can’t hear you.”

Wednesday, April 8th, 2020

How to not make a résumé in React | Eric Bailey

Consider what React and other SPA frameworks are good for: stateful, extensible component-driven applications. Now consider what a résumé’s goals are.

Tuesday, March 24th, 2020

Oh, embed!

I wrote yesterday about how messing about on your own website can be a welcome distraction. I did some tinkering with adactio.com on the weekend that you might be interested in.

Let me set the scene…

I’ve started recording and publishing a tune a day. I grab my mandolin, open up Quicktime and make a movie of me playing a jig, a reel, or some other type of Irish tune. I include a link to that tune on The Session and a screenshot of the sheet music for anyone who wants to play along. And I embed the short movie clip that I’ve uploaded to YouTube.

Now it’s not the first time I’ve embedded YouTube videos into my site. But with the increased frequency of posting a tune a day, the front page of adactio.com ended up with multiple embeds. That is not good for performance—my Lighthouse score took quite a hit. Worst of all, if a visitor doesn’t end up playing an embedded video, all of the markup, CSS, and JavaScript in the embedded iframe has been delivered for nothing.

Meanwhile over on The Session, I’ve got a strategy for embedding YouTube videos that’s better for performance. Whenever somebody posts a link to a video on YouTube, the thumbnail of the video is embedded. Only when you click the thumbnail does that image get swapped out for the iframe with the video.

That’s what I needed to do here on adactio.com.

First off, I should explain how I’m embedding things generally ‘round here. Whenever I post a link or a note that has a URL in it, I run that URL through a little PHP script called getEmbedCode.php.

That code checks to see if the URL is from a service that provides an oEmbed endpoint. A what-Embed? oEmbed!

oEmbed is like a minimum viable read-only API. It was specced out by Leah and friends years back. You ping a URL like this:


In this case http://example.com/oembed is the endpoint and url is the value of a URL from that provider. Here’s a real life example from YouTube:


So https://www.youtube.com/oembed is the endpoint and url is the address of any video on YouTube.

You get back some JSON with a pre-defined list of values like title and html. That html payload is the markup for your embed code.

By default, YouTube sends back markup like this:

allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"

But now I want to use an img instead of an iframe. One of the other values returned is thumbnail_url. That’s the URL of a thumbnail image that looks something like this:


In fact, once you know the ID of a YouTube video (the ?v= bit in a YouTube URL), you can figure out the path to multiple images of different sizes:

(Although that last one—maxresdefault.jpg—might not work for older videos.)

Okay, so I need to extract the ID from the YouTube URL. Here’s the PHP I use to do that:

parse_str(parse_url($url, PHP_URL_QUERY), $arguments);
$id = $arguments['v'];

Then I can put together some HTML like this:

<a class="videoimglink" href="'.$url.'">
<img width="100%" loading="lazy"
https://i.ytimg.com/vi/'.$id.'/mqdefault.jpg 320w,
https://i.ytimg.com/vi/'.$id.'/hqdefault.jpg 480w,
https://i.ytimg.com/vi/'.$id.'/maxresdefault.jpg 1280w

Now I’ve got a clickable responsive image that links through to the video on YouTube. Time to enhance. I’m going to add a smidgen of JavaScript to listen for a click on that link.

Over on The Session, I’m using addEventListener but here on adactio.com I’m going to be dirty and listen for the event directly in the markup using the onclick attribute.

When the link is clicked, I nuke the link and the image using innerHTML. This injects an iframe where the link used to be (by updating the innerHTML value of the link’s parentNode).

this.parentNode.innerHTML='<iframe src=https://www.youtube-nocookie.com/embed/'.$id.'?autoplay=1></iframe>'"

But notice that I’m not using the default YouTube URL for the iframe. That would be:


Instead I’m swapping out the domain youtube.com for youtube-nocookie.com:


I can’t remember where I first came across this undocumented parallel version of YouTube that has, yes, you guessed it, no cookies. It turns out that, not only is the default YouTube embed code bad for performance, it is—unsurprisingly—bad for privacy too. So the youtube-nocookie.com domain can protect your site’s visitors from intrusive tracking. Pass it on.

Anyway, I’ve got the markup I want now:

<a class="videoimglink" href="https://www.youtube.com/watch?v=-eiqhVmSPcs"
this.parentNode.innerHTML='<iframe src=https://www.youtube-nocookie.com/embed/-eiqhVmSPcs?autoplay=1></iframe>'">
<img width="100%" loading="lazy"
alt="The Banks Of Lough Gowna (jig) on mandolin"
https://i.ytimg.com/vi/-eiqhVmSPcs/mqdefault.jpg 320w,
https://i.ytimg.com/vi/-eiqhVmSPcs/hqdefault.jpg 480w,
https://i.ytimg.com/vi/-eiqhVmSPcs/maxresdefault.jpg 1280w

The functionality is all there. But I want to style the embedded images to look more like playable videos. Time to break out some CSS (this is why I added the videoimglink class to the YouTube link).

.videoimglink {
    display: block;
    position: relative;

I’m going to use generated content to create a play button icon. Because I can’t use generated content on an img element, I’m applying these styles to the containing .videoimglink a element.

.videoimglink::before {
    content: '▶';

I was going to make an SVG but then I realised I could just be lazy and use the unicode character instead.

Right. Time to draw the rest of the fucking owl:

.videoimglink::before {
    content: '▶';
    display: inline-block;
    position: absolute;
    background-color: var(--background-color);
    color: var(--link-color);
    border-radius: 50%;
    width: 10vmax;
    height: 10vmax;
    top: calc(50% - 5vmax);
    left: calc(50% - 5vmax);
    font-size: 6vmax;
    text-align: center;
    text-indent: 1vmax;
    opacity: 0.5;

That’s a bunch of instructions for sizing and positioning. I’d explain it, but that would require me to understand it and frankly, I’m not entirely sure I do. But it works. I think.

With a translucent play icon positioned over the thumbnail, all that’s left is to add a :hover style to adjust the opacity:

.videoimglink:focus::before {
    opacity: 0.75;

Wheresoever thou useth :hover, thou shalt also useth :focus.

Okay. It’s good enough. Ship it!

The Banks Of Lough Gowna (jig) on mandolin

If you embed YouTube videos on your site, and you’d like to make them more performant, check out this custom element that Paul made: Lite YouTube Embed. And here’s a clever technique that uses the srcdoc attribute to get a similar result (but don’t forget to use the youtube-nocookie.com domain).

Tuesday, March 3rd, 2020

Visitors, Developers, or Machines

Garrett’s observation is spot-on here:

I’ve been trying to understand the appeal of these frameworks by giving them an objective chance. I’ve expanded my knowledge of JavaScript and tried to give them the benefit of the doubt. They do have their places, but the only explanation I can come up with is that developers are taking a similar approach as Ruby and focusing on developer convenience and productivity. Only, instead of Ruby’s performance being tied to the CPU level, JavaScript frameworks push the performance burden to the client.

In both cases, the tradeoff happens in the name of developer happiness and productivity, but the strategies have entirely different consequences. With Ruby, the CPU is still (mostly) the responsibility of the development team, and it can be upgraded. With JavaScript, the page weight becomes an externality pushed onto visitors.

Tuesday, November 19th, 2019

Modest JS Works | You were never sold on heavy-handed JavaScript approaches. Here’s a case for keeping your JS modest.

The fat JavaScript stacks-du-jour have a lot of appeal. They promise you to be able to do more with less. But what if I want to do less?

This is a terrific little (free!) online book all about modest JavaScript. The second part has practical code, but it’s the first part—all about the principles of staying lean—that really resonates with me.

Don’t build more JS than you can maintain over the long term. If you’re going to be building something for a long time, make sure what you are building will grow with you. Make sure you don’t depend on other people’s work too much, lest you want to keep refactoring your code when the framework you picked goes out of style.

Monday, November 11th, 2019

JavaScript | 2019 | The Web Almanac by HTTP Archive

It’s time for a look at the state of the web when it comes to JavaScript usage. Here’s the report powered by data from HTTP Archive:

JavaScript is the most costly resource we send to browsers; having to be downloaded, parsed, compiled, and finally executed. Although browsers have significantly decreased the time it takes to parse and compile scripts, download and execution have become the most expensive stages when JavaScript is processed by a web page.

Sending smaller JavaScript bundles to the browser is the best way to reduce download times, and in turn improve page performance. But how much JavaScript do we really use?

When it comes to frameworks and UI libraries, there are some interesting numbers. Given the volume of chatter in the dev world, you’d be forgiven for thinking that React is used on the majority of websites today. The real number? 4.6% of websites. That’s less than the number of websites using CSS custom properties.

This is reminding me of what I wrote about dev perception.

Thursday, November 7th, 2019

Tuesday, October 29th, 2019

Using the Platform | TimKadlec.com

Tim ponders the hard work that goes into adding standards to browsers, giving us a system with remarkable longevity.

So much care and planning has gone into creating the web platform, to ensure that even as new features are added, they’re added in a way that doesn’t break the web for anyone using an older device or browser. Can you say the same for any framework out there?

His parting advice is perfect:

Use the platform until you can’t, then augment what’s missing. And when you augment, do so with care because the responsibility of ensuring the security, accessibility, and performance that the platform tries to give you by default now falls entirely on you.

Tuesday, October 8th, 2019

You really don’t need all that JavaScript, I promise

The transcript of a fantastic talk by Stuart. The latter half is a demo of Portals, but in the early part of the talk, he absolutely nails the rise in popularity of complex front-end frameworks:

I think the reason people started inventing client-side frameworks is this: that you lose control when you load another page. You click on a link, you say to the browser: navigate to here. And that’s it; it’s now out of your hands and in the browser’s hands. And then the browser gives you back control when the new page loads.

Wednesday, September 18th, 2019

Keeping it simple with CSS that scales - Andy Bell

The transcript of Andy’s talk from this year’s State Of The Browser conference.

I don’t think using scale as an excuse for over-engineering stuff—especially CSS—is acceptable, even for huge teams that work on huge products.

Friday, August 9th, 2019

Redux: Lazy loading youtube embeds

Remy has an excellent improvement on that article I linked to yesterday on using srcdoc with iframes. Rather than using srcdoc instead of src, you can use srcdoc as well as src. That way you can support older browsers too!

Thursday, August 8th, 2019

Lazy load embedded YouTube videos - DEV Community 👩‍💻👨‍💻

This is a clever use of the srcdoc attribute on iframes.

Native lazy-loading for the web  |  web.dev

The title is somewhat misleading—currently it’s about native lazy-loading for Chrome, which is not (yet) the web.

I’ve just been adding loading="lazy" to most of the iframes and many of the images on adactio.com, and it’s working a treat …in Chrome.