border
Simply put, it is our commonly used border. A very basic usage is
border: 1px solid black; // 等价于 border-width: 1px; border-style: solid; border-color: black;
The following is the effect of the demonstration:
Of course, you can also define many weird border types, such as rounded corners (radius) , maybe the compatibility is not very good), ellipse (in fact, as long as you understand the ellipse, you can draw the border at will).
border 1px solid black; border-radius: 50%;
border-top,-right,-bottom,-left
After reading so many interesting DEMOs, do you really understand borders?
I recently came across an interesting CSS style, which gave me a deep understanding of borders. Usually when we use borders, we basically give the border a width of 1px, and occasionally 2px. We do not find the relationship between the border and the element. When we change the border-width to a larger value, the problem arises.
border: 20px solid gray;
Moreover, the border can be set independently. The values of top, right, bottom, and left are:
border: 20px solid gray; border-top-width: 40px; border-left-width: 40px;
How to judge the intersection of border and border?
It is very important to understand this. If you also find this problem, then the following interesting things will come:
border: 20px solid; border-top-color: black; border-right-color: red; border-bottom-color: gray; border-left-color: blue;
It is actually the line connecting the inner vertex and the outer vertex that separates the border. If you divide the element Both width and height are set to 0, and a radius is added:
width: 0; height: 0; border-radius: 50%;
You should also understand the principle of border-radius before!
Use border to implement arrows
Now that we know some basic knowledge of border, we will You can implement arrows commonly seen in dialog boxes, like the following:
This needs to be achieved with the help of transparency in CSS. For example, we need a right arrow, refer to the example above when width and height are 0 , the corresponding border size is 15px, 0px, 15px, 30px, first look at the example below
border-width: 15px 0px 15px 30px; border-color: black gray; border-style: solid;
At this time, you need to set the colors of border-top and border-bottom to transparent,
border-color: transparent gray;
Then, for The other three angles of arrows can also be designed in the same way:
Summary
After reading this article, do you think the function of border is very powerful? In fact, some of our common bubbles and shapes can be realized with border. Haha, I really despise those students who use pictures. mutual encouragement.

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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