I created home page for Dillo browser. With DuckDuckGo, Yahoo, Bing, Brave, Seznam, wimby.me. I don't know how to implement wikipedia, wiktionary, Baidu.
<html>
<head>
<link rel="canonical" href="https://duckduckgo.com/">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=3.0, user-scalable=1;">
<meta name="referrer" content="origin">
<title>DuckDuckGo Lite: Fast, Lightweight Private Search</title>
<meta name="description" content="The lightest weight version of DuckDuckGo private search. Loads fast on slow connections and compatible with text-based browsers.">
<link title="DuckDuckGo (Lite)" type="application/opensearchdescription+xml" rel="search" href="//duckduckgo.com/opensearch_lite_v2.xml">
<link rel="icon" href="//duckduckgo.com/favicon.ico" type="image/x-icon"/>
<link id="icon60" rel="apple-touch-icon" href="//duckduckgo.com/assets/icons/meta/DDG-iOS-icon_60x60.png?v=2"/>
<link id="icon76" rel="apple-touch-icon" sizes="76x76" href="//duckduckgo.com/assets/icons/meta/DDG-iOS-icon_76x76.png?v=2"/>
<link id="icon120" rel="apple-touch-icon" sizes="120x120" href="//duckduckgo.com/assets/icons/meta/DDG-iOS-icon_120x120.png?v=2"/>
<link id="icon152" rel="apple-touch-icon" sizes="152x152" href="//duckduckgo.com/assets/icons/meta/DDG-iOS-icon_152x152.png?v=2"/>
<link rel="image_src" href="//duckduckgo.com/assets/icons/meta/DDG-icon_256x256.png">
<link rel="stylesheet" media="handheld, all" href="//duckduckgo.com/dist/l.304bf63bbd053ee46b28.css" type="text/css"/>
</head>
<body>
<a name="top"></a>
<center id="lite_wrapper">
<br>
<span class="header">DuckDuckGo</span>
<br><br>
<form method="get" id="search" action="http://lite.duckduckgo.com/lite/">
<input type="hidden" name="sites" value="YOURDOMAIN.COM"/>
<input type="hidden" name="k8" value="#444444"/>
<input type="hidden" name="k9" value="#D51920"/>
<input type="hidden" name="kt" value="h"/>
<input type="text" name="q" maxlength="255" placeholder="Search…"/>
<input type="submit" value="DuckDuckGo Search" style="visibility: hidden;" />
</form>
<br>
<br>
<form action="https://search.yahoo.com/search">
<input type="text" name="p" placeholder="Search Yahoo" />
<input type="hidden" name="nojs" value=""1" />
<button type="submit">Search</button>
</form>
<br>
<form action="https://search.bing.com/">
<input type="text" name="q" placeholder="Search Bing" />
<input type="hidden" name="nojs" value=""1" />
<button type="submit">Search</button>
</form>
<br>
<form action="https://search.brave.com/search?q=%s">
<input type="text" name="q" placeholder="Search Brave" />
<input type="hidden" name="nojs" value=""1" />
<button type="submit">Search</button>
</form>
<br>
<form action="https://search.seznam.cz/?q=%s">
<input type="text" name="q" placeholder="Search Seznam" />
<input type="hidden" name="nojs" value=""1" />
<button type="submit">Search</button>
</form>
<br>
<form action="https://wiby.me/?q=%s">
<input type="text" name="q" placeholder="Search wimby.me" />
<input type="hidden" name="nojs" value=""1" />
<button type="submit">Search</button>
</form>
<script>
document.querySelector("form").addEventListener("submit", (e) => {
e.preventDefault();
// Do my client-side search stuff here
// and stay on the current page
});
</script>
<p class='html-only'>
<!-- This is the Lite version. Get the full-JS version <a href="https://duckduckgo.com/">here</a>. //-->
</p>
</center>
</body>
</html>