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.

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