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How to use css outline-style attribute

青灯夜游Original: 2019-05-28 10:20:522203browse

The outline is a line drawn around the element, located outside the edge of the border. The outline-style attribute is used to set the style of the entire outline of an element; the value of this attribute cannot be set to none, otherwise the outline will not appear.

How to use the css outline-style attribute?

The outline-style property is used to style the entire outline of an element. The style cannot be none, otherwise the outline will not appear.

Syntax:

outline-style : none | dotted | dashed | solid | double | groove | ridge | inset | outset | inherit;

Attribute value:

● None: Default. Define no outline.

● dotted: Define the dotted outline.

● Dashed: Define the dashed outline.

● Solid: Define a solid outline.

● Double: Define a double line outline. The width of the double line is equal to the value of outline-width.

● Groove: Define the 3D groove profile. This effect depends on the outline-color value.

● Ridge: Define the 3D groove profile. This effect depends on the outline-color value.

●　inset: Define the 3D concave edge profile. This effect depends on the outline-color value.

● Outset: Define the 3D convex edge outline. This effect depends on the outline-color value.

● Inherit: Specifies that the outline style settings should be inherited from the parent element.

Note: The outline-style attribute must always be declared before the outline-color attribute, because the element can only change the color of its outline after obtaining the outline.

Note:

outline is the margin around the element; however, it comes from a different border attribute.

The outline is not part of the element's dimensions, so the element's width and height properties do not include the width of the outline. Contours do not take up space and are not necessarily rectangular.

css outline-style attribute example

<!DOCTYPE>
<html>

	<head>
		<meta charset="UTF-8">
		<style type="text/css">
			p {
				border: 1px solid red;
			}
			
			p.dotted {
				outline-style: dotted;
			}
			
			p.dashed {
				outline-style: dashed;
			}
			
			p.solid {
				outline-style: solid;
			}
			
			p.double {
				outline-style: double;
			}
			
			p.groove {
				outline-style: groove;
			}
			
			p.ridge {
				outline-style: ridge;
			}
			
			p.inset {
				outline-style: inset;
			}
			
			p.outset {
				outline-style: outset;
			}
		</style>
	</head>

	<body>

		<p class="dotted">点线轮廓</p>
		<p class="dashed">虚线轮廓</p>
		<p class="solid">实线轮廓</p>
		<p class="double">双线轮廓</p>
		<p class="groove">凹槽轮廓</p>
		<p class="ridge">垄状轮廓</p>
		<p class="inset">嵌入轮廓</p>
		<p class="outset">外凸轮廓</p>
		<p><b>注意:</b> 如果只有一个 !DOCTYPE 指定 IE 8 支持 outline 属性。</p>
	</body>

</html>

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How to use css outline-style attribute

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