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CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.
For example, headings (), etc., are defined structurally using HTML.
Inheritance is the mechanism by which properties are applied not only to a specified element, but also to its descendants.
Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting.
Depending on the browser and the web site, a user may choose from various style sheets provided by the designers, or may remove all added styles and view the site using the browser's default styling, or may override just the red italic heading style without altering other attributes.
It determines which styles apply to an element when more than one rule could apply. H1) has a specificity of 1, class selectors have a specificity of 1,0, and ID selectors a specificity of 1,0,0.
Properties that can be inherited are color, font, letter-spacing, line-height, list-style, text-align, text-indent, text-transform, visibility, white-space and word-spacing.
Properties that cannot be inherited are background, border, display, float and clear, height, and width, margin, min- and max-height and -width, outline, overflow, padding, position, text-decoration, vertical-align and z-index.
Before CSS, document authors who wanted to assign such typographic characteristics to, say, all headings had to repeat HTML presentational markup for each occurrence of that heading type.The W3C has now deprecated the use of all presentational HTML markup.The advantages of this may not be immediately clear (since the second form is actually more verbose), but the power of CSS becomes more apparent when the style properties are placed in an internal style element or, even better, an external CSS file.Descendant elements may inherit CSS property values from any ancestor element enclosing them.
In general, descendant elements inherit text-related properties, but box-related properties are not inherited.
Declarations not set in the highest priority source are passed on to a source of lower priority, such as the user agent style. One of the goals of CSS is to allow users greater control over presentation.