Is the declaration, and again, “p” (meaning the HTML paragraph) is the selector. These same basic principles can be applied to change font sizes, background colors, margin indentations, and more on your web page by choosing the specific selector. Properties are things like font size, color, and margins, while values are the settings for those properties, and you can change these by applying changes to the selector. For example, “background-position,” “border-color,” “border-style,” and “border-width, “and “text-align” are properties and “top,” “red,” “dotted,” “thick,” and “left” are values, respectively. HTML is a markup language that is used to structure content on a web page. HTML elements are the building blocks of an HTML document.

css what is it

This will link the .html file to your style sheet (in this case, mysitestyle.css), and all of the CSS instructions in that file will then apply to your linked .html pages. In short, with CSS features you don’t need to repeatedly describe how individual css cascading elements look. This saves time, shortens the code, and makes it not as prone to errors. CSS was developed by W3C (World Wide Web Consortium) in 1996 for a rather simple reason. HTML element was not designed to have tags that would help format the page.

Applying CSS to the DOM

Based on the above explanation, we know that the browser will begin by parsing the HTML. This process will lead to the creation of the above DOM from the previous section, then parse the CSS. The CSS only has a single rule, which uses a span selector. As such, that rule will apply to every occurrence of in the HTML, of which there are two. This rule sets a background color for the entire page. Change the color code to the color you chose in What will my website look like?.

css what is it

The children will be text nodes as well as those that correlate with the elements. Each node also serves as a parent, each with children in the form of text nodes. The browser will interpret the HTML snippet above as the DOM tree below. Values may be keywords, such as “center” or “inherit”, or numerical values, such as 200px (200 pixels), 50vw (50 percent of the viewport width) or 80% (80 percent of the parent element’s width).

element. It contains three properties and their values (each property/value pair is called a declaration):

In that module, you will also find a link to Specifications that defines the technology (also see the section below). If you solely utilize the Bootstrap style sheet, you can construct your own components to package those styles in a way that can be used efficiently with other components. For example, you can use a bootstrap button component to avoid repeating the same class names. The first problem you will encounter is that naming things gets complicated because of too many CSS classes. You can use a naming convention like BEM (block element modifier) to address this. Global CSS is the most basic approach for styling in Next.js and React apps.

  • It can also be used with any kind of XML documents including plain XML, SVG and XUL.
  • Our career-change programs are designed to take you from beginner to pro in your tech career—with personalized support every step of the way.
  • We round off the module by looking at applying custom fonts to your page, and styling lists and links.
  • Use CSS to solve common problems provides links to sections of content explaining how to use CSS to solve very common problems when creating a web page.
  • 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.