The CSS cascade assigns a weight to each style rule. When several rules apply, the one with the greatest weight takes precedence. You can think of some rules coming from "higher up" in the cascade; these combine with the rules at the next level down, and the result combines with the next level, and so on, until finally you have the actual rules to be applied to the document pooled at the "base" of the cascade. The cascade is the mechanism by which rules from different places are combined to create an über-stylesheet
Cascading Style Sheets (CSS)
Style sheets refer to a set of rules that allow you to control how you would like your document to be rendered. It is a mechanism to primarily separate presentation from content. With the HTML and style sheets approach, structured content goes into the HTML document, and the appearance, or presentation information goes into a style sheet. CSS allow you to control the rendering of elements on a web page without compromising its structure. Before CSS , nearly all of the presentational attributes of an HTML document were contained within the HTML code; all font colors, background styles, alignment specification, boxes, borders, and sizes had to be explicitly described, often repeatedly, in the midst of the HTML code. CSS allows web designers to extract this information, resulting in considerably simpler HTML code, supplemented by an auxiliary style sheet written in the language of CSS . The structure and semantic markup is restricted to the HTML code, while the presentational markup is restricted to the CSS code.
Child
In HTML, an element A is called the child of element B if an only if B is the parent of A.
Click Here
The phrase "click here" is a bad linking practice. It makes navigating the web difficult for both sighted and unsighted users. Link text should be meaningful enough to make sense when read out of context.
Color Contrast
Color contrast refers to how close hues are in value. The human eye requires good contrast for visibility and legibility. Contrast creates visual interest and helps deliver accurate information. It can make a big difference on a web page. Colors that are close in value tend to blur together, and their borders "melt." This can create legibility problems. For example, black text on a dark blue background is difficult to read.
Color Saturation
Color saturation refers to the intensity of a color.
Content Management System
A content management system separates the content of a Web site from its code, allowing nontechnical users to update, approve and post content.
Control Structures
In programming, control structures are used to control the logical flow through a script.
