css Cascading Style Sheets
• Generally speaking, all styles have the following rules (the fourth one has the highest priority)
1. Browser default
Browser default
2. External style sheet
External style sheet
3 . Internal style sheet (inside the
Inline style (inside an HTML element)
External style sheets allow you to change the appearance and layout of all that appear in your WEB, just by editing a single CSS document. (The principle is to change everything)
The syntax of CSS consists of three parts: a selector, a Attribute and a value, for example:
selector {property: value}
The selector is the element or label that needs to be defined
For example: body{color:red} Define the color attribute of the label body to red
If the value is Multiple words are enclosed in double quotes
For example: p {font-family: "sans serif"}
If you specify multiple attributes, each attribute must be separated by a semicolon
For example: p {text-align: center;color:red}
Each HTML element can only have one class attribute
You can use p.right {text-align: right} to modify the left and right p elements with the class attribute of right Or label
If you use .right{text-align: right} to modify all elements or labels whose class attribute is right, there is no meaning of specifically referring to a type of label or element.
id selector
css can use
#attribute{} to modify all id attributes to the same element or label similar to class. One is to use. The other is to use #
The attribute name of class id cannot start with a number, otherwise it will not work properly in Mozilla/Firefox
css comments /* */
Three ways to insert a style sheet
• External Style Sheet
• Internal Style Sheet
Use the
• Inline Styles
Use the style attribute on relevant tags to add inline styles. Style properties can contain any CSS property. The example will show how to add left spacing to a paragraph and change the color to red
This
is a paragraph

在css中,可用list-style-type属性来去掉ul的圆点标记,语法为“ul{list-style-type:none}”;list-style-type属性可设置列表项标记的类型,当值为“none”可不定义标记,也可去除已有标记。

区别是:css是层叠样式表单,是将样式信息与网页内容分离的一种标记语言,主要用来设计网页的样式,还可以对网页各元素进行格式化;xml是可扩展标记语言,是一种数据存储语言,用于使用简单的标记描述数据,将文档分成许多部件并对这些部件加以标识。

在css中,可以利用cursor属性实现鼠标隐藏效果,该属性用于定义鼠标指针放在一个元素边界范围内时所用的光标形状,当属性值设置为none时,就可以实现鼠标隐藏效果,语法为“元素{cursor:none}”。

转换方法:1、给英文元素添加“text-transform: uppercase;”样式,可将所有的英文字母都变成大写;2、给英文元素添加“text-transform:capitalize;”样式,可将英文文本中每个单词的首字母变为大写。

在css中,rtl是“right-to-left”的缩写,是从右往左的意思,指的是内联内容从右往左依次排布,是direction属性的一个属性值;该属性规定了文本的方向和书写方向,语法为“元素{direction:rtl}”。

在css中,可以利用“font-style”属性设置i元素不是斜体样式,该属性用于指定文本的字体样式,当属性值设置为“normal”时,会显示元素的标准字体样式,语法为“i元素{font-style:normal}”。

在css3中,可以用“transform-origin”属性设置rotate的旋转中心点,该属性可更改转换元素的位置,第一个参数设置x轴的旋转位置,第二个参数设置y轴旋转位置,语法为“transform-origin:x轴位置 y轴位置”。


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