nav
Navigation satellite
up
##UP的英[ʌp] 美[ʌp]
css nav-up attribute syntax
Function:The nav-up attribute specifies where to navigate when using the nav-up navigation key.
Syntax: nav-up: auto|id|target-name|inherit;
Description : auto The browser decides which element to navigate to. id specifies the id of the navigated element. target-name specifies the target frame to be navigated. inherit specifies that the value of the nav-up attribute should be inherited from the parent element.
Note: Currently only Opera supports the nav-up attribute.
css nav-up attribute example
<!DOCTYPE html>
<html>
<head>
<style>
button
{
position:absolute;
}
button#b1
{
top:20%;left:25%;
nav-index:1;
nav-right:#b2; nav-left:#b4;
nav-down:#b2; nav-up:#b4;
}
button#b2
{
top:40%;left:50%;
nav-index:2;
nav-right:#b3; nav-left:#b1;
nav-down:#b3; nav-up:#b1;
}
button#b3
{
top:70%;left:25%;
nav-index:3;
nav-right:#b4; nav-left:#b2;
nav-down:#b4; nav-up:#b2;
}
button#b4
{
top:40%;left:0%;
nav-index:4;
nav-right:#b1; nav-left:#b3;
nav-down:#b1; nav-up:#b3;
}
</style>
</head>
<body>
<button id="b1">Button 1</button>
<button id="b2">Button 2</button>
<button id="b3">Button 3</button>
<button id="b4">Button 4</button>
<p><b>注释：</b>目前只有 Opera 支持 nav-* 属性。当您使用方向键导航时，请同时按下 Shift 键。</p>
</body>
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