New browsers will interpret the line using pixels, but then override it with the line using calc() as that line appears later in the cascade. Rather than by laboriously going through the document and changing the color for each individual h1 element. A CSS stylesheet will contain many such rules, written one after the other. As we have mentioned before, CSS is a language for specifying how documents are presented to users — how they are styled, laid out, etc. It’s true that there are so many tutorials about them and even more examples floating around CodePen. There was a time just a couple of years ago when loaders seemed to be the go-to example for framework documentation, next to to-do apps.

css what is it

It serves as a way to group elements and apply consistent styles. Imagine you have several headings in your website’s content that you want to style in the same way. Instead of writing the same CSS rules for each of them individually, you can create a CSS class to define those styles once and then apply it to each heading element. It is a style sheet language which is used to describe the look and formatting of a document written in markup language.

Class selectors target an element that has a specific value for its class attribute:

When you check the checkbox, the background colour of the .main div will change to #ccc, and when you uncheck it, the background will revert to transparent. This industry needs every bit of help from people with different perspectives. There are more people using the things we build than the number of people building them – and it’s a shame that the industries don’t always accurately represent their user base. There’s plenty of space on the internet for everybody.

CSS is a rule-based language — you define the rules by specifying groups of styles that should be applied to particular elements or groups of elements on your web page. If you have more than one thing which uses the same CSS then the individual css cascading selectors can be combined into a selector list so that the rule is applied to all of the individual selectors. For example, if I have the same CSS for an h1 and also a class of .special, I could write this as two separate rules.


Typically they’re used to implement new, or proprietary CSS features, prior to final clarification/definition by the W3. It is a wildcard, this means it will select all elements within that portion of the DOM. If you’re looking into less-well-used CSS selectors, you may also want to look at +, ~, and [attr] selectors, all of which can be very useful. In order to set the width and height of an element correctly in all browsers, you need to know how the box model works. For a complete list of selectors, see our CSS selectors reference. I could also combine these into a selector list, by adding a comma between them.

What I really wanted was a donut progress indicator that not only fills in as the progress increases but sets a visual on it that moves with the progress. In other words, I wanted to make it look like an object is traveling around the donut, leaving a trail of progress behind. I recently had the task of creating the loading state for a project, so naturally, I looked to CodePen for inspiration. What I wanted was a circular shape, and there is no shortage of examples.

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