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What is the border attribute used for in css?

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The border property in CSS defines the appearance of an element's border, including width, style, and color. It uses the following property parameters: Width: Specifies the width of the border in pixels (px), em, or other CSS units. Style: Define the appearance of the border. Options include none (no border), hidden (hidden border), dotted (dotted border), dashed (dashed border), solid (solid border), double (double solid border), groove (grooved border), ridge (raised border), inset (embedded border), outset (protruding border). Color: Specify the color of the border, using CSS color values ​​or t

What is the border attribute used for in css?

##CSS border property: Define the element border

The

border property in CSS is used to specify the appearance of an element's border. It allows you to control the width, color and style of the border.

Attribute value:

<code>border: width style color;</code>

Attribute parameter:

  • Width (width): Specify the width of the border, you can use pixels (px), em or other CSS units.
  • Style: Define the appearance of the border:

    • none: No border
    • hidden:hidden border
    • dotted:dotted border
    • dashed:dashed border
    • solid:solid border
    • double:double solid border
    • groove:groove border
    • ridge: raised border
    • inset: inset border
    • outset: highlighted border
  • Color (color): Specify the color of the border, using CSS color values ​​or transparent (transparent).

Usage:

You can use the

border property in CSS to set the style of each border, or you can use the abbreviation:

<code>border: [width] [style] [color];</code>
For example:

<code>/* 设置所有边框为 1px 实线黑色 */
border: 1px solid black;

/* 设置顶部边框为 2px 虚线红色 */
border-top: 2px dashed red;

/* 设置左右边框为 3px 双实线蓝色 */
border-left: 3px double blue;
border-right: 3px double blue;</code>

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