As for HTML, there’s not much to learn right away and you can kind of learn as you go, but before making your first templates, know the difference between in-line elements like <span> and how they differ from block ones like <div>. This will save you a huge amount of headache when fiddling with your CSS code.
What is ‘good’ HTML?
In fact, part of what we commonly call ‘HTML5’ is the Parsing Algorithm which is like an HTML ninja – incredibly powerful, yet rarely noticed. It ensures that all modern browsers construct the same DOM from the same HTML, regardless of whether the HTML is well-formed or not. It’s the greatest fillip to interoperability we’ve ever seen.
By ‘good’ HTML, I mean semantic HTML, a posh term for choosing the right HTML element for the content. This isn’t a philosophical exercise; it has directly observable practical benefits.
For example, consider the <button> element. Using this gives you some browser behaviour for free:
A button is focusssable via the keyboard. I bet you, dear reader, know all the keyboard shortcuts for your IDE; it makes development much faster. Many people use only the keyboard when using a webpage. I do it because I have multiple sclerosis – therefore the fine motor control required to use a mouse can be difficult for me. My neighbour has arthritis, so she prefers to use the keyboard.
Buttons can be activated using the space bar or the enter key; you don’t have to remember to listen for these keypresses in your script.
Here’s another example: semantically linking a <label> to its associated <input> increases usability for a mouse-user or touch-screen user, because clicking in the label focusses into the input field. See this in action (and how to do it) on MDN.
This might be me, with my MS; it might be you, on a touch-screen device on a bumpy train, trying to check a checkbox. How much easier it is if the hit area also includes the label “uncheck to opt out of cancelling us not sending you spam forever”. (Compare the first and second identical-looking examples in a checkbox demo.)
But the point is that by choosing the right element for the job, you’re getting browser behaviour for free that makes your app more usable to a range of different people.
Invisible browser behaviours
With me so far? Good. The browser behaviours associated with the semantics of <button> and <label> are obvious once you know about them – because you can see them.
Other semantics aren’t so obvious to a sighted developer with a desktop machine and a nice big monitor, but they are incredibly useful for those who do need them. Let’s look at some of those.
HTML5 has some semantics that you can use for indicating regions on a page. For example, <nav>, <main>, <header>, <footer>.
If you wrap your main content – that is, the stuff that isn’t navigation, logo and main header etc – in a <main> tag, a screen reader user can jump immediately to it using a keyboard shortcut. Imagine how useful that is – they don’t have to listen to all the content before it, or tab through it to get to the main meat of your page.
And for people who don’t use a screenreader, that <main> element doesn’t get in the way. It has no default styling at all, so there’s nothing for you to remove. For those that need it, it simply works; for those that don’t need it, it’s entirely transparent.
Similarly, using <nav> for your primary navigation provides screenreader users with a shortcut key to jump to the navigation so they can continue exploring your marvellous site. You were probably going to wrap your navigation in a <div class=”nav”> to position it and style it; why not choose <nav> instead (it’s shorter!) and make your site more usable to the 15% of the world who have a disability?
Update: here’s a YouTube video of blind screenreader user Leonie Watson talking through how she navigates this site using the HTML semantics we’ve discussed.
New types of devices
We’re seeing more and more types of devices connecting to the web, and semantic HTML can help these devices display your content in a more usable way to their owners. And if your site is more usable than your competitors’, you win, and your boss will erect a massive gold statue of you in the office car park. (Trust me, your boss told me. They’ve already ordered the plinth.)
We’ve brought Reader to watchOS 5 where it automatically activates when following links to text heavy web pages. It’s important to ensure that Reader draws out the key parts of your web page by using semantic markup to reinforce the meaning and purpose of elements in the document. Let’s walk through an example. First, we indicate which parts of the page are the most important by wrapping it in an article tag.
Specifically, enclosing these header elements inside the article ensure that they all appear in Reader. Reader also styles each header element differently depending on the value of its itemprop attribute. Using itemprop, we’re able to ensure that the author, publication date, title, and subheading are prominently featured.
(If you plan to put things into microdata, please note that Apple, being Apple, go their own way, and don’t use a schema.org vocabulary here. Le sigh. See my article Content needs a publication date! for more. Or view source on this page to see how I’m using microdata on this article.)
Apple WatchOS also optimises display of items wrapped in <figure> elements:
Reader recognizes these tags and preserves their semantic styles. For this image, we use figure and figcaption elements to let the Reader know that the image is associated with the below caption. Reader then positions the image alongside its caption.
You probably know that HTML5 greatly increased the number of different <input> types, for example <input type=”email”> on a mobile device shows a keyboard with the “@” symbol and “.” that are in all email addresses; <input type=”tel”> on a mobile device shows a numeric keypad.
On desktop browsers, where you have a physical keyboard, you may get different User Interface benefits, or built-in validation. You don’t need to build any of this; you simply choose the right semantic that best expresses the meaning of your content, and the browser will choose the best display, depending on the device it’s on.
In WatchOS, input types take up the whole watch screen, so choosing the correct one is highly desirable.
First, choose the appropriate type attribute and element tag for your form controls.
WebKit supports a variety of form control types including passwords, numeric and telephone fields, date, time, and select menus. Choosing the most relevant type attribute allows WebKit to present the most appropriate interface to handle user input.
Secondly, it’s important to note that unlike iOS and macOS, input methods on watchOS require full-screen interaction. Label your form controls or specify aria label or placeholder attributes to provide additional context in the status bar when a full-screen input view is presented.
I didn’t choose to use <article> and itemprop and input types because I wanted to support the Apple Watch; I did it before the Apple Watch existed, in order that my code is future-proof. By choosing the right semantics now, a machine that I don’t know about yet can understand my content and display it in the best way for its users. You are opting out of this if you only use <div> or <span> because, by definition, they have “no special meaning at all”.
I hope I’ve shown you that choosing the correct HTML isn’t purely an academic exercise. Perhaps you can’t use all the above (and there’s much more that I haven’t discussed) but when you can, please consider whether there’s an HTML element that you could use to describe parts of your content.
For instance, when building components that emit banners and logos, consider wrapping them in <header> rather than <div>. If your styling relies upon classnames, <header class=”header”> will work just as well as <div class=”header”>.
Semantic HTML will give usability benefits to many users, help to future-proof your work, potentially boost your search engine results, and help people with disabilities use your site.
And, best of all, thinking more about your HTML will stop Dull Old Web Farts like me moaning at you.
What’s not to love? Have a splendid holiday season, whatever you celebrate – and here’s to a semantic 2019!
How to Learn CSS – Rachel Andrew’s on the core concepts of CSS that will help you work with CSS, rather than against it.
The dialog element – intro to this very useful element. browser support is about 70% globally, behind a flag in Firefox. Polyfills are available.
Ways to extract slides – techy post by Remy Sharp. “When you run events, once everything is over, it’s nice to be able to share the slides both as a single link but also for the video production*… this post is reminder for my future self on how to do that.”
Programming CSS by Jezza Keef. “It’s precisely because CSS selectors (and the cascade) are so powerful that we choose to put guard rails in place.”
Open-source wedding site – “Now that my wedding is over, I am open-sourcing it”. fully responsive, RSVP uploads to Google Sheets & emails; Add to Calendar feature; single-tap book Uber to venue; no DB required – uses GitHub pages
Acme Inc is organizing and sponsoring Timbuktu’s biggest annual developer conference called “Timbuk-Toot!”. Past speakers include Richard Stallman, Morgan Freeman, Humphrey Bogart and Cruella de Vil.
Would you like to give a workshop or a talk at Timbuk-Toot! in February 2019?
Let me know!
And that was it. It’s not nearly enough information to make a decision, so —unless it’s from someone I know, or I’ve always always wanted to visit Timbuktu— I park this, thinking “I’ll email back and ask them for more information”. Then, of course, the rest of the day happens and I forget about it.
So, if you’re emailing someone to ask them to speak, at a minimum I’d need this information:
what do you want me to talk about? What’s the theme of the conference?
How long is a talk? How long is a workshop?
Are the talks recorded? Are they available to all, e.g. over YouTube?
How many people attend? Who attends?
You mention Acme Inc; is it an internal Acme staff conference, or open to the public?
What are the dates? How can I answer when i’m only told “February 2019”?
Are you paying for my flights/ accommodation? I suspect not, as you don’t mention it.
If you are covering travel expenses, am I expected to pay them and get them reimbursed? If yes, how many days does it take for me to get my money back? (A the moment, over Xmas, I’m giving an two-month interest-free loan of 1000Euro to a conference.)
If I’m a freelancer, are you paying a fee for my time? I suspect not, as you don’t mention it.
Is there a code of conduct? Where is it? Is the speaker line-up inclusive? (Probably not, if you’re not paying expenses or a speaker fee.)
You need to tell me why I should care about it. You might be huge in the Timbuktu web industry, but I don’t know you. So far, all you have done is raise questions which means I have to reply to you and ask them, on top of all the other things I have to do today.