学习笔记:css selector
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css can be composed by:
selector { property: value; }
1. type selector
h1 {color: #36c;}
2. universal selector
* {color: #365;}
3. decendent selector
ul em {text-transform: uppercase; }
4. class selector
Tag.classValue {border: 1px solid #c00;}
5. id selector
#idvalue { text-align: right; }
上面这些选择器是所有浏览器都支持的。下面的选择器属于css2,在ie7, firefox等版本进行支持,ie6就可能不支持了。
6. child selector
fatherTag>childTag{font-weight: bold;}
7. attribute selector
p[lang] p[lang="fr"] p[lang~="fr"] p[lang|="fr"]
CSS sorting
Whether the selector is the HTML style attribute of an element, rather than a true selector.
The number of id attributes in the selector.
The number of other attribute (for example, [lang] , [rel] , [href] ) and pseudo-class (for example, :hover , :visited , :first-child ) names in the selector. Remember that class selectors (such as li.active ) are a type of attribute selector and are tallied up in this category.
The number of element (for example, a , li , p , and so on) and pseudo-element (for example, :before , :after , and so on) names in the selector.
CSS Box model
every element in your document tree has a content area; this could be text, an image, or so forth. Additionally, padding, border, and margin areas may surround that content area.
padding :
它是padding-top, padding-right, padding-bottom, padding-left的简写,可以带有1~4个参数。
对于4个参数,一次代表top, right, bottom, left的值,例如 padding: 80px 10px 5px 10px;
对于一个参数,代表4边的padding都相同,例如padding: 10px, 代表所有padding都是10px;
对于2个参数,bottom的值和top相同,left和right相同。例如padding: 80px 10px 5px;
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