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In css3, double-line border means that the element border consists of two single lines, and the interval between them is always equal to the specified border width value; you can use the "border-style" attribute to set the element's border to double-line, as long as the attribute value is set to double, and the syntax is "{border-style:double;}".

The operating environment of this tutorial: windows10 system, CSS3&&HTML5 version, Dell G3 computer.

What does the double border of css3 mean?

A double-line border means that the border of an element consists of two single lines, and the interval between them is always equal to the specified width of the border.

The border-style attribute sets the style of the four borders of an element. This property can have one to four values.

Property value defines a double line for double. The width of the double line is equal to the value of border-width.

Other property values are as follows:

Examples are as follows:

123 p.none {border-style:none;} p.dotted {border-style:dotted;} p.dashed {border-style:dashed;} p.solid {border-style:solid;} p.double {border-style:double;} p.groove {border-style:groove;} p.ridge {border-style:ridge;} p.inset {border-style:inset;} p.outset {border-style:outset;} p.hidden {border-style:hidden;} p.mix {border-style:dotted dashed solid double;} without borders.

Dotted border.

Dotted border.

Solid border.

Double-sided box.

Grooved frame.

Ridge border.

Embed the border.

Convex border.

Hide the border.

Mixed border

Output result:

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