For those beginners just getting started with web design, a single direct question always seems to come up right away. CSS, or cascading style sheets, is the designer’s link to a toolset that allows for truly amazing style options on an HTML document. This module provides a gentle beginning to your path towards CSS mastery with the basics of how it works, what the syntax looks like, and how you can start using it to add styling to HTML.
If there are conflicts in styles being applied to the same element but coming from different origins, certain origins are preferred over others. If you remove the inline style from the paragraph tag, the color will be blue. In the above example, color will be green why do we need cascading style sheets because green comes the last compared to internal styles or the stylesheet. The estimation of inherited values is complex for a web user, but it is rarely needed where styles are fully specified. For a browser, the matter needs to be a more methodical process.
All CSS properties have initial values as defaults, written into a Property Definition Table as a part of the browser’s design process. Figure 3 shows a fairly usual arrangement of tags where a paragraph is nested within a division tag set, and all of that is assumed to be within the body tags of the web-document. In addition, note that there are declarations within the paragraph tag; one id, two classes and an in-line style. When the cascade has run its course, the original set of declared styles will have been reduced to a set of cascaded styles, but many properties will not have been declared in the first place. In order for the browser to function correctly there must be a single value for every property that is considered essential for that element’s formatting.
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. In the case above the paragraph font-size and line-height will be the same as for the body tag. In this case the div tag inherits from the body tag since the div has no such properties specified. The paragraph inherits from the div for the same reason.
This paragraph will be center aligned and red.
With that code in place, the HTML page will render in the following format. In the sample code image below you have a very basic HTML document with no CSS work applied. Instead of versioning the CSS specification, W3C now periodically takes a snapshot of the latest stable state of the CSS specification and individual modules progress.
With some further adjustments of the set, used values result, and these are tried in the rendering of the page. These might be further adjusted to accommodate constraints in layout https://deveducation.com/ or to round font sizes, at which point they are referred to as the actual values. This section provides an intuitive rather than a detailed description of the cascade process.