If one of the big tech companies says you're wrong, you might shrug it off. But when four of them — Apple, Google, Microsoft and Mozilla — call you out, that's when you're in real trouble. This is the situation the World Wide Web Consortium (W3C) found itself in after pulling some shenanigans with the next version of the Document Object Model (DOM).

If you're learning CSS, or you want a friendly introduction to some of its terms and concepts, try 30 Seconds of CSS. Each entry on this site shows a different bit of code, demonstrates the result, and explains how each part of the code works.

It was once the case that to do anything fancy with a web page, you needed a healthy dose of JavaScript. However, it's 2016 and HTML and CSS have come a long way. You might be surprised at what you can do without a single line of JS.

Let's say you're new to web design, but you're intent on learning how to build a site from start to finish. It can be a lot of info to take in, but this interactive tool can at least help get you started with the design.

These days, CSS can do much more than style fonts and add borders around elements. For example, you can apply colour, brightness and other tweaks to images, live, without having to resort to a photo editor.

We've all heard stories of people who look at a website mockup and say something like "It needs more pop!" or "Make it sleeker" without being specific about what they're looking for. It can be a pain, but this tongue-firmly-in-cheek graphic translates those phrases to language you can actually use.

Keeping up with the latest CSS features can be daunting -- just when you've got your head around key frames and animations, you find out you can do scaling and translation using 3D acceleration. One such gem available in CSS3 is the "calc" function, which can be used to perform maths operations on various numbers and percentages, without the use of JavaScript.

Windows/Mac/Linux: Adobe just launched Brackets 1.0, a text editor for web developers. It's free and has inline editing, live preview and preprocessor support features.

Don't like the way a site looks or want to add some code to enhance it? Tomado is a simple webapp for modding a site to your liking.

This version of London's iconic tube map looks just like the official PDF of the transport network. In fact, it is created entirely from HTML, CSS and JavaScript.

The web becomes more and more capable each day, finding ways to replace what you do on your desktop. In the very near future you'll talk to your web apps, enjoy complex animation without the drain of Flash, and maybe even plug in your guitar. These features and more already exist, and they're coming to the broad internet this year.

Building an impressive web site takes work, whether you love to code or don't know the first thing about it. There are lots of tools which aim to make creating a site easier, but no single option fits everyone's needs. In this post, we'll take a look at a handful of popular options, their pros and cons, and why you might pick them to build your web site.

Need to maintain CSS from anywhere? Signup for a (currently) free WebPutty beta account to host and serve your site's Cascading Style Sheets (CSS). The in-browser CSS editor offers a side-by-side preview pane with instant updating and is compatible with CSS extension Sass (SCSS) and Compass, an open-source CSS authoring framework.

Chrome: Stylebot lets you easily adjust the style sheets of nearly any page using a button-based control panel or editing the raw text of the style sheet. Most people will use this for mundane applications such as font changes and hiding ads, but using this powerful extension you can completely reskin sites and share your custom CSS with others using the developer's forum.

If you learnt to make a website with us, or if you're just picking up HTML and CSS, you may have wanted to learn a few more complex styles. One of the best ways to learn is by looking at other code, and CSS3 Generator can write custom CSS code for you so you can learn how it works (or just use it).

Last week we taught you how to make a web site from start to finish, including finding a reliable web host to host your site. Here's the complete guide so you have access to all the lessons in one convenient location.

We're big fans of keyboard shortcuts 'round these parts, but while lots of web pages advertise their shortcuts well, many go unnoticed. Here's a CSS tweak for Firefox from a reader that will show you which links on a page have keyboard shortcuts.

While we happen to love comments and the lively discussion that occurs in them, we understand that not everybody wants to see the comments left by other internet users. Shutup.css lets you apply a custom stylesheet and eradicate comments across the web.

Firefox: If you've ever sighed and said "Oh Firebug, if only you were wide screen!", today is your lucky day. Widerbug is a version of the popular web development tool tweaked for wide screens.