CSS outline property is a shorthand property, used to set all outline properties, such as color, style, width, in one statement. It can draw a line around the element at the edge of the border, which can highlight The role of elements.
CSS outline property
Function: is drawn on A line around an element, just outside the edge of the border, that serves to highlight the element.
outline shorthand property sets all outline properties in one declaration. The following properties can be set in order: outline-color, outline-style, outline-width. If you do not set one of the values, there will be no problem. For example, outline:solid #ff0000; is also allowed.
●outline-color: Specifies the color of the outline.
●Outline-style: Specifies the style of the outline.
●outline-width: Specifies the width of the outline.
Note: Contour lines do not occupy space and are not necessarily rectangular.
Note: So all mainstream browsers support the outline attribute; Internet Explorer 8 (and later versions) only supports the outline attribute when !DOCTYPE is specified.
Example of using CSS outline attribute
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
<style type="text/css">
div
{
border:red solid thin;
outline:#00ff00 dotted thick;
padding:10px;
}
</style>
</head>
<body>
<div>测试文本！</div>
</body>
</html>Rendering:
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