Although the long list of allowed properties and values is very important to CSS, it is even more important to know how and where those properties can be applied to documents. This is accomplished with selectors, pseudo-classes, pseudo-elements, and a collection of what are called at-rules. In order to associate styles with a specific element or set of elements, it is necessary to create a selector. This is the part of a style rule which selects an element or set of elements and therefore causes the styles to be applied to them. There are many kinds of selectors.
A type selector is one which selects elements in the document’s language type. (In CSS1, this was called an element selector.) These are the simplest kinds of selectors.
Under HTML and XHTML, these will be the familiar document elements like H2, PRE, TABLE, and so on. In other markup languages, the permitted type selectors will be the range of elements permitted in that particular markup language.
A descendant selector is composed of a space-separated list of two or more selectors. Note that the descendant can be of any relation, from a direct child to a grandchild, or even further. Thus, the selector div strong will select a STRONG element which is contained within a DIV element, no matter how many "levels deep" the STRONG may be found. To select an element which is the child of another.
The universal selector is treated much like a wild-card symbol in regular expressions. It can be used to ensure that elements of a sufficiently removed relation to the parent element are selected; for example, div * p will only select paragraphs that are no closer than grandchildren of a DIV. Any paragraph which is a child of the DIV will not be selected. If no selector is present in a rule, then the universal selector is implied.
Any text which appears between two elements OF css bold item in dropdown list will not affect the operation of this selector, unless that text is contained within an element which is sibling to the other two elements. Thus, if a paragraph is followed by some text which is followed by a DIV, then the text between the two does not affect sibling adjacency. If the intervening text were enclosed in an H3 element, then the H3 would prevent the paragraph and the DIV from being adjacent siblings. Similarly, if two inline elements are separated by text, they are still adjacent siblings. Internet Explorer 4 and 5 both have problems handling this selector, and often will match the last type selector in the expression, regardless of its context. In other words, em+strong will match all STRONG elements in the document.
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