CSS border-top

<!doctype html>
<title>Example</title>
<style>
div {
  font-size: 1.5em;
  padding: 20px;
  border-top: 9px dotted orange;
  }
</style>
<div>This 'div' is styled using the CSS border-top property. Try changing the values to see the effect it has on the top border styles.</div>

The CSS border-top property is a shorthand property for setting the width, style, and color of the top border of a box.

Syntax

Possible Values

line-width: Sets the width of the top border. See the border-top-width property.
line-style: Sets the style of the top border. See the border-top-style property.
color: Sets the color of the top border. See the border-top-color property.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial: Represents the value specified as the property's initial value.
inherit: Represents the computed value of the property on the element's parent.
unset: This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

General Information

Initial Value

This is based on the individual properties' values. Their initial values are as follows:

border-top-width: medium
border-top-style: none
border-top-color: Uses currentColor (which is the value of the color property).

Applies To

All elements.

Inherited?

Media

Visual

Animatable

Yes (see example)

Example Code

Official Specifications

CSS Backgrounds and Borders Module Level 3 (W3C Candidate Recommendation 9 September 2014)
CSS Level 2.1 (W3C Recommendation 07 June 2011)
CSS Level 1 (W3C Recommendation 17 Dec 1996)