The id and class Selectors
In addition to setting a style for a HTML element, CSS allows you to specify your own selectors called "id" and "class".
The id Selector
The id selector is used to specify a style for a single, unique element.
The id selector uses the id attribute of the HTML element, and is defined with a "#".
The style rule below will be applied to the element with id="para1":
Example#para1 { text-align:center; color:red; } The class SelectorThe class selector is used to specify a style for a group of elements. Unlike the id selector, the class selector is most often used on several elements. This allows you to set a particular style for many HTML elements with the same class. The class selector uses the HTML class attribute, and is defined with a "." In the example below, all HTML elements with class="center" will be center-aligned: Example.center {text-align:center;} You can also specify that only specific HTML elements should be affected by a class. In the example below, all p elements with class="center" will be center-aligned: Examplep.center {text-align:center;} |
|
|
|
|
|
阅读(158) | 评论(0) | 转发(0) |