Detailed introduction to the border-image attribute in CSS3

We know that the original intention of using the border-image attribute is to simplify complex work. When you master this attribute, you will find that you greatly save coding time and efficiency. Next, I will teach you how to use border-image.

The element border is irregular. At this time, you need to use the design drawing as the border background. Compared with background-image, border-image has the advantage of being more flexible. You can use code to control the stretching and repetition of the border background, so you can create Produce more diverse effects

The button width and height are uncertain. Use border-image to create buttons. You can use the same background image to create buttons of various widths and heights.

border-image attribute analysis

Border backgroundPicture. The format is: url("...").

border-image-slice

The distance the image border is offset inwards. Format: border-image-slice: top right bottom left. Respectively refer to the distance between the four lines cutting the background image from the top, right, bottom and left.

The distance accepts numerical values ​​and percentages. The default value unit is px, but px cannot be added after the value, otherwise this css will not be parsed by the browser. The usage is similar to margin, padding. Here we use numerical values ​​as examples, and the same applies to percentages.

border-image-slice: 10; /*The distance between top, bottom, left and right is 10px;*/

border-image-slice: 10 30; /*The distance between top and bottom is 10px, left and right is 30px;* /

border-image-slice: 10 30 20; /*The distance is 10px up, 20px down, and 30px left and right;*/

border-image-slice: 10 30 20 40; /* The distance is 10px on the top, 30px on the right, 20px on the bottom, and 40px on the left;*/

The four lines divide the background image into 9 parts, among which 1,2,3,4,6,7,8,9 Eight areas will be cut as the image border. If in addition to setting the value or percentage, a "fill" is added, then area 5 will be used as the background to fill the element content, such as:

border-image -slice: 25 11 fill;

Note: slice does not accept negative values; if the sum of the left and right distances of the slice cutting is greater than the width of the background image, the upper and lower borders will not be displayed. If the sum of the upper and lower distances of the slice is greater than the height of the background image, the left and right borders will not be displayed.

border-image-width

The width of the image border. Only numerical values ​​are accepted, and units cannot be added.

# I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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