Tags: elements

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sparkline

Wednesday, April 10th, 2019

Web Components will replace your frontend framework

I’ve often said that the goal of a good library should be to make itself redundant. jQuery is the poster child for that, and this article points to web components as the way to standardise what’s already happening in JavaScript frameworks:

Remember when document.querySelector first got wide browser support and started to end jQuery’s ubiquity? It finally gave us a way to do natively what jQuery had been providing for years: easy selection of DOM elements. I believe the same is about to happen to frontend frameworks like Angular and React.

The article goes on to give a good technical overview of custom elements, templates, and the Shadow DOM, but I was surprised to see it making reference to the is syntax for extending existing HTML elements—I’m pretty sure that that is, sadly, dead in the water.

Wednesday, March 20th, 2019

CSS custom properties in generated content

Cassie posted a neat tiny lesson that she’s written a reduced test case for.

Here’s the situation…

CSS custom properties are fantastic. You can drop them in just about anywhere that a property takes a value.

Here’s an example of defining a custom property for a length:

:root {
    --my-value: 1em;
}

Then I can use that anywhere I’d normally give something a length:

.my-element {
    margin-bottom: var(--my-value);
}

I went a bit overboard with custom properties on the new Patterns Day site. I used them for colour values, font stacks, and spacing. Design tokens, I guess. They really come into their own when you combine them with media queries: you can update the values of the custom properties based on screen size …without having to redefine where those properties are applied. Also, they can be updated via JavaScript so they make for a great common language between CSS and JavaScript: you can define where they’re used in your CSS and then update their values in JavaScript, perhaps in response to user interaction.

But there are a few places where you can’t use custom properties. You can’t, for example, use them as part of a media query. This won’t work:

@media all and (min-width: var(--my-value)) {
    ...
}

You also can’t use them in generated content if the value is a number. This won’t work:

:root {
    --number-value: 15;
}
.my-element::before {
    content: var(--number-value);
}

Fair enough. Generated content in CSS is kind of a strange beast. Eric delivered an entire hour-long talk at An Event Apart in Seattle on generated content.

But Cassie found a workaround if the value you want to put into that content property is numeric. The CSS counter value is a kind of generated content—the numbers that appear in front of ordered list items. And you can control the value of those numbers from CSS.

CSS counters work kind of like variables. You name them and assign values to them using the counter-reset property:

.my-element {
    counter-reset: mycounter 15;
}

You can then reference the value of mycounter in a content property using the counter value:

.my-element {
    content: counter(mycounter);
}

Cassie realised that even though you can’t pass in a custom property directly to generated content, you can pass in a custom property to the counter-reset property. So you can do this:

:root {
    --number-value: 15;
}
.my-element {
    counter-reset: mycounter var(--number-value);
    content: counter(mycounter);
}

In a roundabout way, this allows you to use a custom property for generated content!

I realise that the use cases are pretty narrow, but I can’t help but be impressed with the thinking behind this. Personally, I would’ve just read that generated content doesn’t accept custom properties and moved on. I would’ve given up quickly. But Cassie took a step back and found a creative pass-the-parcel solution to the problem.

I feel like this is a hack in the best sense of the word: a creatively improvised solution to a problem or limitation.

I was trying to display the numeric value stored in a CSS variable inside generated content… Turns out you can’t do that. But you can do this… codepen.io/cassie-codes/p… (not saying you should, but you could)

Monday, March 18th, 2019

HTML periodical table (built with CSS grid)

This is a nifty visualisation by Hui Jing. It’s really handy to have elements categorised like this:

  • Root elements
  • Scripting
  • Interactive elements
  • Document metadata
  • Edits
  • Tabular data
  • Grouping content
  • Embedded content
  • Forms
  • Sections
  • Text-level semantics

Friday, March 15th, 2019

BEM: 4 Hang-Ups & How It Will Help Your CSS Organization

A few common gotchas when using BEM, and how to deal with them.

Saturday, February 9th, 2019

CSS Remedy

This is a really interesting approach that isn’t quite a CSS reset or a normalisation. Instead, it’s an experiment to reimagine what a default browser stylesheet would be like if it were created today, without concerns about backwards compatibility:

Applies basic styling to form elements and controls, getting you started with custom styling. We want to find the balance between providing a base for implementing a custom design, and allowing OS-level control over how form inputs work (like how a number pad works on iOS).

Provides a very lightweight starter file, with generic visual styling that you will want to replace. This isn’t as robust or opinionated as a starter-theme or framework. We’ve leaned toward specifying less, so you have less to override. (We haven’t defined any font families, for example.)

You can contribute by adding issues.

Friday, February 1st, 2019

How do you figure? | CSS-Tricks

A good reminder from Chris—prompted by Scott O’Hara’s article—that the figcaption element and the alt attribute do different things. If you use an empty alt attribute on an img inside a figure, then your figcaption element is captioning nothing …and no, using the same text for both is not the solution.

Sunday, January 27th, 2019

Make Your ARIA Labels Sing on Key — Knowbility

A good look at the (over)use of the aria-label attribute that confirms the first rule of ARIA.

Thursday, January 3rd, 2019

Elemental haiku

An ode for every element in the periodic table, in the form of a haiku.

Wednesday, September 19th, 2018

HTML elements, unite! The Voltron-like powers of combining elements. | CSS-Tricks

This great post by Mandy ticks all my boxes! It’s a look at the combinatorial possibilities of some of the lesser-known HTML elements: abbr, cite, code, dfn, figure, figcaption, kbd, samp, and var.

Sunday, September 9th, 2018

Removing jQuery from GitHub.com frontend | GitHub Engineering

You really don’t need jQuery any more …and that’s thanks to jQuery.

Here, the Github team talk through their process of swapping out jQuery for vanilla JavaScript, as well as their forays into web components (or at least the custom elements bit).

Saturday, September 1st, 2018

Conversational Semantics · An A List Apart Article

I love, love, love all the little details of HTML that Aaron offers up here. And I really like how he positions non-visual user-agents like searchbots, screen readers, and voice assisants as headless UIs.

HTML is a truly robust and expressive language that is often overlooked and undervalued, but it has the incredible potential to nurture conversations with our users without requiring a lot of effort on our part. Simply taking the time to code web pages well will enable our sites to speak to our customers like they speak to each other. Thinking about how our sites are experienced as headless interfaces now will set the stage for more natural interactions between the real world and the digital one.

Thursday, August 2nd, 2018

Accessibility: Start with the foundations | susan jean robertson

I encourage you to think about and make sure you are using the right elements at the right time. Sometimes I overthink this, but that’s because it’s that important to me - I want to make sure that the markup I use helps people understand the content, and doesn’t hinder them.

Tuesday, July 31st, 2018

The Accessibility of Styled Form Controls & Friends | a11y_styled_form_controls

A great collection of styled and accessible form elements:

Form controls are necessary in many interfaces, but are often considered annoying, if not downright difficult, to style. Many of the markup patterns presented here can serve as a baseline for building more attractive form controls without having to exclude users who may rely on assistive technology to get things done.

Tuesday, July 10th, 2018

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

Monday, June 4th, 2018

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!

Wednesday, May 9th, 2018

CodePen Challenge - May 2018 - HTML Buddies

I really like this month’s CodePen challenge, all about HTML elements that go well together. First up: del and ins.

Tuesday, April 3rd, 2018

How display: contents; Works

A really deep dive into display: contents from Ire.

Tuesday, March 27th, 2018

Designing Button States - Cloud Four

The canonical example in just about every pattern library is documenting button variations. Here, Tyler shows how even this seemingly simple pattern takes a lot of thought.

Saturday, February 3rd, 2018

Building a Good Download… Button? | CSS-Tricks

I love these kinds of deep dives into one seemingly simple pattern; in this case it’s a download link with the humble A element.

Saturday, January 6th, 2018

A Sliding Nightmare: Understanding the Range Input | CSS-Tricks

Ana goes into exhaustive detail on all the differences in the shadow DOM and styling of input type="range" across browsers.

I’m totally fine with browsers providing different styling for complex UI elements like this, but I wish they’d at least provide a consistent internal structure and therefore a consistent way of over-riding the default styles. Maybe then people wouldn’t be so quick to abandon native elements like this in favour building their own UI components from scratch—the kind of over-engineering that inevitably ends up being under-engineered.