Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/css-ui/nav-dir-missing-3.html

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<!DOCTYPE html>

<title>CSS Basic User Interface Test: Directional Focus Navigation - unkown element id</title>

<style>

#start {

nav-down: #foo;

}

</style>

</head>

<body>

<p>First, use directional navigation to navigate the focus to the "START" link below.</p>

<!-- In Opera 12.16, directional navigation may be done using Shift+<arrow key>.

In the SmartTV emulator, use the keypad in the GUI. -->

<p>Test passes if navigating down moves the focus to the "FINISH" link.</p>

<a href="" id="start">START</a><br>

<a href="" id="finish">FINISH</a>

</body></html>