A11Y Style Guide is a handy reference for how to mark-up your web documents accessibly in HTML + CSS.

Some handy CSS snippets for your bookmarks!

Cropping Images in CSS With object-fit - it's a bit like the background-size property for background images but works on embedded images.

Can I use object-fit

A Theme Switcher: now this looks like the perfect way to create a high contrast version of your site:

filter: invert(100%)

Unfortunately the filter property isn't widely supported yet, and there are a few caveats that need addressed, but it looks like a really lightweight method.

Mike Riethmuller explains how to get the best out of CSS variables. I particularly like his idea that:

media queries should not be required except for changing CSS variables

Read the article to find out what he means.

Microsoft Edge @font-face not displaying all fonts

At Doepud we rarely find annoying bugs with browsers these days, partly because we like to keep our CSS and JavaScript simple, but mainly because browser vendors do a great job sticking to standards and delivering a consistent experience across a wide range of devices. It was a surprise then to find, when showing a client a demo version of their new site, and on a web browser that we normally consider to be pretty decent (Microsoft Edge) a very unusual bug feature. The issue was related to @font-face, or more specifically @import, with the main headings not displaying the embedded font as expected.

Firefox, Chrome and Opera all ok... but not Edge

Everything was working fine in Firefox, Chrome and Opera but not Microsoft's Edge browser (as it happened, we also found the issue extended to Internet Explorer 11).

Media Queries

Turns out that within our CSS file, when requesting fonts (using @import) inside a media query, like this:

@charset "utf-8";

@media screen {
    //imports
        @import 'normalise';
        @import 'fonts';
...

...Microsoft Edge (and IE11 let's not forget) opted to ignore them entirely. So, moving the @import rule up and outside the @media screen resolved the issue:

@charset "utf-8";
@import 'fonts';

@media screen {
    //imports
        @import 'normalise';
...

Some things never change eh? Microsoft have always liked to do things their own way.

Keeping aspect ratio of YouTube videos

Experiments in fixed aspect ratios is a handy CSS technique from Stephanie Liu for displaying video embeds in a responsive website without losing their aspect ratio.

The HTML:

<div class="container">
  <iframe class="embed"></iframe>
</div>

The CSS:

.container {
  position: relative;
  width: 100%;
  height: 0;
  padding-top: 56.25% // 9 / 16 * 100%
}

.embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

CSS Grid lands in Firefox 52 - the Firefox web browser, made by the Mozilla Foundation, is the first major browser to provide full support for the CSS Grid Layout module. This should become the defacto layout technique for most of our work going forward. Exciting times!

CSS ICON, not just a decent sized collection of icons made entirely with CSS but also a very slick animated function to swap between two icons.

Pure CSS Tooltip and Pure CSS Dropdown Menu.