add legacy support of checkbox, add documents for cookie/lgres/request

lib/ui/icon.html

@@ -24,9 +24,9 @@
     同上述 <code>id: string</code>，<code>[data-type]</code> 同上述
     <code>type: string</code>
   </p>
+  <hr />
   <h2>示例</h2>
-  <pre>
-&lt;div id="icon-sample"&gt;
+  <pre>&lt;div id="icon-sample"&gt;
   &lt;svg data-id="address-card" data-type="fa-regular"&gt;&lt;/svg&gt;
   &lt;svg data-id="user-edit" data-type="fa-light"&gt;&lt;/svg&gt;
   &lt;svg data-id="frog" data-type="fa-solid"&gt;&lt;/svg&gt;