<!doctype html>
<html lang="en" id="html">
        <head>
                <meta charset="utf-8">
                <meta name="viewport" content="width=device-width, initial-scale=1">
                <title>focus_next()/focus_prev()</title>
<style>
*:focused {
        background: green;
}
</style>
        </head>
        <body id="body">
                <a id="before" href="simple.html">before</a>
                <a id="invisible" href="simple.html" style="display: none">invisible</a>
                <textare