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Mandy Michael turns the corner on our variable font adventure and stumbles into a grotto of wonder and amazement. Not forgetting the need for a proper performance budget, Mandy shows how variable fonts can free your creativity from bygone technical constraints.

If you read Jason’s introductory article about variable fonts, you’ll understand the many benefits and opportunities that they offer in modern web development. From this point on we’ll assume that you have either read Jason’s introduction or have some prior knowledge of variable fonts so we can skip over the getting started information. If you haven’t read up on variable fonts before jump over to “Introduction to Variable Fonts: Everything you thought you knew about fonts just changed” first and then come join me back here so we can dive into using variable fonts for interactivity and animations!

Creative Opportunities

If we can use variable fonts to improve the performance of our websites while increasing the amount of style variations available to us, it means that we no longer need to trade off design for performance. Creativity can be the driving force behind our decisions, rather than performance and technical limitations.

My goal is to demonstrate how to create interactive, creative text on the web by combining variable fonts with CSS and JavaScript techniques that you may already be familiar with. With the introduction of variable fonts, designs which would have previously been a heavy burden on performance, or simply impossible due to technical limitations, are now completely possible.

The tone and intent of our words can be more effectively represented with less worry over the impacts of loading in “too many font weights” (or other styles). This means that we can start a new path and focus on representing the content in more meaningful ways. For example, emphasising different words, or phrases depending on their importance in the story or content.

Note: using variable fonts does not negate the need for a good web font performance strategy! This is still important, because after all, they are still fonts. Keep that in mind and check out some of the great work done by Monica Dinculescu, Zach Leatherman or this incredible article by Helen Homes.

Variable Fonts & Animations

Because variable fonts can have an interpolated range of values we can leverage the flexibility and interactive nature of the web. Rather than using SVG, videos or JavaScript to accomplish these effects, we can create animations or transitions using real text, and we can do this using techniques we may already be familiar with. This means we can have editable, selectable, searchable, copy-pastable text, which is accessible via a screenreader.

Grass Variable Font Demo

This effect is achieved using a font called Decovar, by David Berlow. To achieve the animation effect we only need a couple of things to get started.

First, we set up the font-family and make use of the new property font-variation-settings to access the different axes available in Decovar.

h1 {
  font-family: "Decovar";
  font-variation-settings: 'INLN' 1000, 'SWRM' 1000;
}

For this effect, we use two custom axis – the first is called “inline” and is represented by the code INLI and the second is “skeleton worm” represented by the code SWRM. For both axes, the maximum value is 1000 and the minimum value is 0. For this effect, we’ll make the most of the full axis range.

Once we have the base set up, we can create the animation. There are a number of ways to animate variable fonts. In this demo, we’ll use CSS keyframe animations and the font-variation-settings property, but you can also use CSS transitions and JavaScript as well.

The code below will start with the “leaves” expanded and then shrink back until it disappears.

@keyframes grow {
  0% {
    font-variation-settings: 'INLN' 1000, 'SWRM' 1000;
  }
  100% {
    font-variation-settings: 'INLN' 1000, 'SWRM' 0;
  }
}

Once we have created the keyframes we can add the animation to the h1 element, and that is the last piece needed in order to create the animation.

h1 {
  font-family: "Decovar";
  font-variation-settings: 'INLN' 1000, 'SWRM' 1000;
  animation: grow 4s linear alternate infinite;
}

What this demonstrates is that typically, to accomplish effects like this, the heavy lifting is done by the font. We really only need a few lines of CSS for the animation, which if you think about it, is pretty incredible.

There are all sorts of interesting, creative applications of variable fonts, and a lot of incredible fonts you can make the most of. Whether you want to create that “hand-writing” effect that we often see represented with SVG, or something a little different, there are a lot of different options.

Duos Writer: Hand Writing

Decovar: Disappearing Text

Cheee: Snow Text

Variable Fonts, Media Queries and Customisation

It’s not that these are just beautiful or cool effects, what they demonstrate is that as developers and designers we can now control the font itself and that that means is that variable fonts allow typography on the web to adapt to the flexible nature of our screens, environments and devices.

We can even make use of different CSS media queries to provide more control over our designs based on environments, light contrast and colour schemes.

Though the CSS Media Queries Level 5 Spec is still in draft stages, we can experiment with the prefers-color-scheme (also known as dark mode) media query right now!

Dark Mode featuring Oozing Cheee by OhNoTypeCo

The above example uses a font called “Cheee” by OhNoTypeCo and demonstrates how to make use of a CSS Transition and the prefers-color-scheme media query to transition the axis of a variable font.

h1 {
  font-family: “Cheee"
  font-variation-settings: "TEMP" 0;
  transition: all 4s linear;
}

@media (prefers-color-scheme: dark) {
  h1 {
    font-variation-settings: "TEMP" 1000;
  }
}

Dark mode isn’t just about changing the colours, it’s important to consider things like weight as well. It’s the combination of the weight, colour and size of a font that determines how legible and accessible it is for the user. In the example above, I’m creating a fun effect – but more practically, dark mode allows us to modify the contrast and styles to ensure better legibility and usability in different environments.

What is even more exciting about variable fonts in this context is that if developers and designers can have this finer control over our fonts to create more legible, accessible text, it also means the user has access to this as well. As a result, users that create their own stylesheets to customise the experience to their specific requirements, can now adjust the pages font weight, width or other available axis to what best suits them. Providing users with this kind of flexibility is such an incredible opportunity that we have never had before!

As CSS develops, we’ll have access to different environmental and system features that allow us to take advantage of our users unique circumstances. We can start to design our typography to adjust to things like screen width - which might allow us to tweak the font weight, width, optical size or other axes to be more readable on smaller or larger screens. Where the viewport is wide we can have more detail, when its smaller in a more confined space we might look at reducing the width of the font—this helps to maintain the integrity of the design as the viewport gets smaller or, to fit text into a particular space.

We have all been in the situation where we just need the text to be slightly narrower to fit within the available space. If you use a variable font with a width axis you can slightly modify the width to adjust to the space available, and do so in a way that the font was designed to do, rather than using things like letter spacing which doesn’t consider the kerning of the characters.

Variable Fonts, JavaScript and Interactive Effects

We can take these concepts even further and mix in a little JavaScript to make use of a whole suite of different interactions, events, sensors and apis. The best part about this is whether you are using device orientation, light sensors, viewport resizes, scroll events or mouse movement, the base JavaScript doesn’t really change.

To demonstrate this, we’ll use a straightforward example – we’ll match our font weight to the size of our viewport – as the viewport gets smaller, the font weight gets heavier.

We’ll start off by setting our base values. We need to define the minimum and maximum axis values for the font weight, and the minimum and maximum event range, in this case the viewport size. Basically we’re defining the start and end points for both the font and the event.

// Font weight axis range
const minAxisValue = 200
const maxAxisValue = 900

// Viewport range
const minEventValue = 320px
const maxEventValue = 1440px

Next we determine the current viewport width, which we can access with something like window.innerWidth.

// Current viewport width
const windowWidth = window.innerWidth

Using the current viewport width value, we create the new scale for the viewport, so rather than the pixels values we convert it to a range of 0 - 0.99.

const windowSize = (windowWidth - minEventValue) / (maxEventValue - minEventValue)
// Outputs a value from 0 - 0.99

We then take that new viewport decimal value and use it to determine the font weight based on viewport scale.

const fontWeight = windowSize * (minAxisValue - maxAxisValue) + maxAxisValue;
// Outputs a value from 200 - 900 including decimal places

This final value is what we use to update our CSS. You can do this however you want – lately I like to use CSS Custom Properties. This will pass the newly calculated font weight value into our CSS and update the weight as needed.

// JavaScript
p.style.setProperty("--weight", fontWeight);

Finally, we can put all this inside a function and inside an event listener for window resize. You can modify this however you need to in order to improve performance, but in essence, this is all you need to achieve the desired outcome.

function fluidAxisVariation() {
  // Current viewport width
  const windowWidth = window.innerWidth

  // Get new scales for viewport and font weight
  const viewportScale = (windowWidth - 320) / (1440 - 320);
  const fontWeightScale = viewportScale * (200 - 900) + 900;

  // Set in CSS using CSS Custom Property
  p.style.setProperty("--weight", fontWeightScale);
}

window.addEventListener("resize", fluidAxisVariation);

You can apply this to single elements, or multiple. In this case, I’m changing the paragraph font weights and different rates, but also reducing the width axis of the headline so it doesn’t wrap onto multiple lines.

As previously mentioned, this code can be used to create all sorts of really amazing, interesting effects. All that’s required is passing in different event and axis values.

In the following example, I’m using mouse position events to change the direction and rotation of the stretchy slinky effect provided by the font “Whoa” by Scribble Tone.

We can also take the dark mode/colour schemes idea further by making use of the Ambient Light Sensor to modify the font to be more legible and readable in low light environments.

This effect uses Tiny by Jack Halten Fahnestock from Velvetyne Type Foundry and demonstrates how we modify our text based by query the characteristics of the user’s display or light-level, sound or other sensors.

It’s only because Variable fonts give us more control over each of these elements that we can fine-tune the font characteristics to maximise the legibility, readability and overall accessibility of our website text. And while these examples might seem trivial, they are great demonstrations of the possibilities. This is a level of control over our fonts and text that is unprecedented.

Variable Fonts offer a new world of interactivity, usability and accessibility, but they are still a new technology. This means we have the opportunity to figure out how and what we can achieve with them. From where I stand, the possibilities are endless, so don’t be limited by what we can already do – the web is still young and there is so much for us to create. Variable fonts open up doors that never existed before and they give us an opportunity to think more creatively about how we can create better experiences for our users.

At the very least, we can improve the performance of our websites, but at best, we can make more usable, more accessible, and more meaningful content - and that, is what gets me really excited about the future of web typography with variable fonts.

About the author

Mandy is a community organiser, speaker, and developer working as the Front End Development Manager at Seven West Media in Western Australia. She is a co-organiser and Director of Mixin Conf, and the founder and co-organiser of Fenders, a local meetup for front-end developers providing events, mentoring and support to the Perth web community.

Mandy’s passion is CSS, HTML and JS and hopes to inspire that passion in others. She loves the supportive and collaborative nature of the web and strives to encourage this environment through the community groups she is a part of. Her aim is to create a community of web developers who can share, mentor, learn and grow together.

More articles by Mandy

Frances Berriman asks us to give the gift of consideration to those who are using the web on constricted devices such as low-end smart phones or feature phones. Christmas is a time of good will to all, and as Bugsy Malone reminds us, you give a little love and it all comes back to you.

If I was given the job of Father Christmas with all my human limitations, apparently it would take me something like 6 months at non-stop full speed to deliver gifts to every kid on the planet. The real Father Christmas has the luxury of magic when it comes to delivering millions of gifts in just one night, but the only magical platform at my disposal is the world wide web, so I propose switching to digital gift cards and saving the reindeer feed.

300 million people are set to come online for the very first time in 2020, and a majority of those will be doing so via mobile phones (smart- and feature-phones). If we want those new users to have a great time online, spending those gift cards, we need to start thinking about their needs and limitations.

Suit up

We might not be hopping on the sleigh for these deliveries, but let’s suit up for the journey and get the tools we need to start testing and checking how our online gift-receivers will be enjoying their online shopping experience.

Of course, the variety of phones and OSs out there is huge and varied, but we have a few options out there to get a sense for the median. Here’s a few suggestions on where to start:

• Never has there been a better time to advocate at your workplace for a device testing suite or lab.
• You can also just pick up a low-end phone for a few bucks and spend some real time using it and getting a sense for how it feels to live with it every day. May I suggest the Nokia 2 or the Moto E6 - both very representative devices of the sort our new visitors will be on.
• You’ve also got WebPageTest.org at your disposal, where you can emulate various phones and see your sites rendered in real-time to get a sense of what an experience may look like for your users.
• You’ll also want to set yourself some goals. A performance budget, for example, is a good way to know if the code you’re shipping hits the mark in a more programmatic way.

Gift wrap

Many of us began our internet lives on desktop machines, and thanks to Moore’s law, these machines have been getting ever more powerful every year with more CPUs and memory at our disposal. The mobile phone landscape somewhat resets us on what hardware capacity is available on the client-side of our code, so it’s time to lighten the load.

What we see in the landscape of phones today is a huge spread of capabilities and CPU speeds, storage capacity and memory. And the gap between the haves and the have-nots is widening, so we have a huge task to deal with in meeting the needs of such a varied audience.

As far as possible, we should try to:

• Keep processing off the client - do anything you can server-side. Consider a server-side render (hold the <script>, thanks) for anything relatively static (including cached frequent queries and results) to keep client-side JavaScript to the minimum. This way you’re spending your CPU, not the user’s.
• Avoid sending everything you have to to the end user. Mobile-first access also means data-plan-first access for many, which means they may be literally paying in cold-hard cash for everything you send over the wire – or may be experiencing your site over a degraded “4G” connection towards the end of the month.
• Aggressively cache assets to prevent re-downloading anything you’ve sent before. Don’t make the user pay twice if they don’t have to.
• Progressively load additional assets and information as the user requests them, rather than a big upfront payload, that way you’re giving the end user a little more choice about whether they want or need that extra data set.

This is all to say that as web developers, we have a lot more control over how and when we deliver the meat of our products - unlike native apps that generally send the whole experience down as one multi-megabyte download that our 4G and data-strapped users can’t afford.

Make a wish

Finally, it’s time for your gift recipients to go out onto the web and find whatever their greatest wish is. For many, that’s going to begin when they first turn on their phone and see all those enticing icons on their home screen. Opening a browser may not be their first port of call.

They’ll be primed to look for sites and information through the icon-heavy menu that most mobile OSs use today, and they will be encouraged to find new experiences through the provided app store interface.

The good news is that web experience can be found in many modern app-stores today.

For example, if you build an app using Trusted Web Activities, the Google Play Store will list your web site right alongside native apps and allow users to install them on their phones. Samsung and Microsoft have similar options without the extra step of creating a TWA - they’ll list any Progressive Web App in their stores. Tools like Microsoft’s PWA Builder and Llama Pack are making this easier than ever.

If your users are primed to search for new experiences via a search engine instead, then they’ll benefit from the work you’ve put in to list them in app stores regardless, as PWAs are first and foremost about making websites mobile-friendly, regardless of point of sale. A PWA will provide them with offline support, service works, notifications and much more.

We do have a grinch in this story, however.

Apple’s iOS explicitly does not allow your website to be listed in their app store, so sadly you’ll have a harder time reaching those users. But it is possible! Fortunately, iOS isn’t as all-dominating world wide as it is in the tech community, selling only around 10-15% of smartphones out in the world.

The best present

The WWW is a wonderful gift that we received over 30 years ago and, as web developers, we get to steward and share this truly global, open, platform with millions of people every day. Let’s take care of it by building and sharing experiences that truly meet the needs of everyone.

About the author

Frances Berriman is a San Francisco-based British-born designer and web developer who blogs at fberriman.com. She’s done all sorts of things, but has a special soft spot for public sector projects, and has worked for the Government Digital Service, building GOV.UK, Code for America, Nature Publishing and the BBC and is currently Head of UX and Product Design at Netlify.

More articles by Frances

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