Tags: scripts

43

sparkline

Thursday, October 29th, 2020

Phantom Analyzer

A simple, real-time website scanner to see what invisible creepers are lurking in the shadows and collecting information about you.

Looks good for adactio.com, thesession.org, and huffduffer.com …but clearleft.com is letting the side down.

Wednesday, October 21st, 2020

Van11y: Accessibility and Vanilla JavaScript - ES2015

Van11y (for Vanilla-Accessibility) is a collection of accessible scripts for rich interfaces elements, built using progressive enhancement and customisable.

Wednesday, September 23rd, 2020

Blacklight – The Markup

This is an excellent new tool for showing exactly what kind of tracking a site is doing:

Who is peeking over your shoulder while you work, watch videos, learn, explore, and shop on the internet? Enter the address of any website, and Blacklight will scan it and reveal the specific user-tracking technologies on the site—and who’s getting your data. You may be surprised at what you learn.

Best of all, you can inspect the raw data and analyse the methodology.

There are some accompanying explainers:

Wednesday, July 8th, 2020

Design systems on the Clearleft podcast

If you’ve already subscribed to the Clearleft podcast, thank you! The first episode is sliding into your podcast player of choice.

This episode is all about …design systems!

I’m pretty happy with how this one turned out, although as it’s the first one, I’m sure I’ll learn how to do this better. I may end up looking back at this first foray with embarrassment. Still, it’s fairly representative of what you can expect from the rest of the season.

This episode is fairly short. Just under eighteen minutes. That doesn’t mean that other episodes will be the same length. Each episode will be as long (or as short) as it needs to be. Form follows function, or in this case, episode length follows content. Other episodes will be longer. Some might be shorter. It all depends on the narrative.

This flies in the face of accepted wisdom when it comes to podcasting. The watchword that’s repeated again and again for aspiring podcasters is consistency. Release on a consistent schedule and have a consistent length for episodes. I kind of want to go against that advice just out of sheer obstinancy. If I end up releasing episodes on a regular schedule, treat it as coincidence rather than consistency.

There’s not much of me in this episode. And there won’t be much of me in most episodes. I’m just there to thread together the smart soundbites coming from other people. In this episode, the talking heads are my colleagues Jon and James, along with my friends and peers Charlotte, Paul, and Amy (although there’s a Clearleft connection with all of them: Charlotte and Paul used to be Clearlefties, and Amy spoke at Patterns Day and Sofa Conf).

I spoke to each of them for about an hour, but like I said, the entire episode is less than eighteen minutes long. The majority of our conversations ended up on the cutting room floor (possibly to be used in future episodes).

Most of my time was spent on editing. It was painstaking, but rewarding. There’s a real pleasure to be had in juxtaposing two snippets of audio, either because they echo one another or because they completely contradict one another. This episode has a few examples of contradictions, and I think those are my favourite moments.

Needless to say, eighteen minutes was not enough time to cover everything about design systems. Quite the opposite. It’s barely an introduction. This is definitely a topic that I’ll be returning to. Maybe there could even be a whole season on design systems. Let me know what you think.

Oh, and you’ll notice that there’s a transcript for the episode. That’s a no-brainer. I’m a big fan of the spoken word, but it really comes alive when it’s combined with searchable, linkable, accessible text.

Anyway, have a listen and if you’re not already subscribed, pop the RSS feed into your podcast player.

Tuesday, March 17th, 2020

Scripts: async, defer

I’m constantly forgetting the difference between the async attribute and the defer attribute on script elements—this is a handy explanation.

Sunday, December 29th, 2019

Move Fast & Don’t Break Things | Filament Group, Inc.

This is the transcript of a brilliant presentation by Scott—read the whole thing! It starts with a much-needed history lesson that gets to where we are now with the dismal state of performance on the web, and then gives a whole truckload of handy tips and tricks for improving performance when it comes to styles, scripts, images, fonts, and just about everything on the front end.

Essential!

Saturday, November 16th, 2019

What would happen if we allowed blocking 3rd-Party JavaScript as an option?

This would be a fascinating experiment to run in Firefox nightly! This is in response to that post I wrote about third-party scripts.

(It’s fascinating to see how different this response is to the responses from people working at Google.)

Friday, September 13th, 2019

5G Will Definitely Make the Web Slower, Maybe | Filament Group, Inc.

The Jevons Paradox in action:

Faster networks should fix our performance problems, but so far, they have had an interesting if unintentional impact on the web. This is because historically, faster network speed has enabled developers to deliver more code to users—in particular, more JavaScript code.

And because it’s JavaScript we’re talking about:

Even if folks are on a new fast network, they’re very likely choking on the code we’re sending, rendering the potential speed improvements of 5G moot.

The longer I spend in this field, the more convinced I am that web performance is not a technical problem; it’s a people problem.

Tuesday, September 10th, 2019

Request mapping

The Request Map Generator is a terrific tool. It’s made by Simon Hearne and uses the WebPageTest API.

You pop in a URL, it fetches the page and maps out all the subsequent requests in a nifty interactive diagram of circles, showing how many requests third-party scripts are themselves generating. I’ve found it to be a very effective way of showing the impact of third-party scripts to people who aren’t interested in looking at waterfall diagrams.

I was wondering… Wouldn’t it be great if this were built into browsers?

We already have a “Network” tab in our developer tools. The purpose of this tab is to show requests coming in. The browser already has all the information it needs to make a diagram of requests in the same that the request map generator does.

In Firefox, there’s a little clock icon in the bottom left corner of the “Network” tab. Clicking that shows a pie-chart view of requests. That’s useful, but I’d love it if there were the option to also see the connected circles that the request map generator shows.

Just a thought.

Friday, August 23rd, 2019

Is client side A/B testing always a bad idea in your experience? · Issue #53 · csswizardry/ama

Harry enumerates the reasons why client-side A/B testing is terrible:

  • It typically blocks rendering.
  • Providers are almost always off-site.
  • It happens on every page load.
  • No user-benefitting reuse.
  • They likely skip any governance process.

While your engineers are subject to linting, code-reviews, tests, auditors, and more, your marketing team have free rein of the front-end.

Note that the problem here is not A/B testing per se, it’s client-side A/B testing. For some reason, we seem to have collectively decided that A/B testing—like analytics—is something we should offload to the JavaScript parser in the user’s browser.

Tuesday, May 7th, 2019

Test the impact of ads and third party scripts

This is a very useful new feature in Calibre, the performance monitoring tool. Now you can get data about just how much third-party scripts are affecting your site’s performance:

The best way of circumventing fear and anxiety around third party script performance is to capture metrics that clearly articulate their performance impact.

Monday, March 18th, 2019

Hello, Goodbye - Browser Extension

A handy browser extension for Chrome and Firefox:

“Hello, Goodbye” blocks every chat or helpdesk pop up in your browser.

Thursday, January 31st, 2019

194028 – Add limits to the amount of JavaScript that can be loaded by a website

Now this is a feature request I can get behind!

A user must provide permission to enable geolocation, or notifications, or camera access, so why not also require permission for megabytes of JavaScript that will block the main thread?

Without limits, there is no incentive for a JavaScript developer to keep their codebase small and dependencies minimal. It’s easy to add another framework, and that framework adds another framework, and the next thing you know you’re loading tens of megabytes of data just to display a couple hundred kilobytes of content.

I’m serious about this. It’s is an excellent proposal for WebKit, similar to the never-slow mode proposed by Alex for Chromium.

Thursday, September 20th, 2018

The costs and benefits of tracking scripts – business vs. user // Sebastian Greger

I am having a hard time seeing the business benefits weighing in more than the user cost (at least for those many organisations out there who rarely ever put that data to proper use). After all, keeping the costs low for the user should be in the core interest of the business as well.

Friday, September 14th, 2018

On using tracking scripts | justmarkup

Weighing up the pros and cons of adding tracking scripts to a website, from a business perspective and from a user perspective.

When looking at the costs versus the benefits it is hard to believe that almost every website is using tracking scripts.

The next time, you implement a tracking script it would be great if you could rethink it and ask yourself if it is really worth it.

Wednesday, September 12th, 2018

Private by Default

Feedbin has removed third-party iframes and JavaScript (oEmbed provides a nice alternative), as well as stripping out Google Analytics, and even web fonts that aren’t self-hosted. This is excellent!

Thursday, September 6th, 2018

Chrome’s NOSCRIPT Intervention - TimKadlec.com

Testing time with Tim.

Long story short, the NOSCRIPT intervention looks like a really great feature for users. More often than not it provides significant reduction in data usage, not to mention the reduction in CPU time—no small thing for the many, many people running affordable, low-powered devices.

Saturday, September 1st, 2018

Changing Our Approach to Anti-tracking - Future Releases

This is excellent news from Mozilla. Firefox is going to make it easier to block vampiric privacy-leeching and performance-draining third-party scripts and trackers.

In the physical world, users wouldn’t expect hundreds of vendors to follow them from store to store, spying on the products they look at or purchase. Users have the same expectations of privacy on the web, and yet in reality, they are tracked wherever they go.

Monday, August 27th, 2018

Disable scripts for Data Saver users on slow connections - Chrome Platform Status

An excellent idea for people in low-bandwidth situations: automatically disable JavaScript. As long as the site is built with progressive enhancement, there’s no problem (and if not, the user is presented with the choice to enable scripts).

Power to the people!

Thursday, August 2nd, 2018

The Cost Of JavaScript In 2018 – Addy Osmani – Medium

Addy takes a deep, deep dive into JavaScript performance on mobile, and publishes his findings on Ev’s blog, including this cra-yay-zy suggestion:

Maybe server-side-rendered HTML would actually be faster. Consider limiting the use of client-side frameworks to pages that absolutely require them.