HTML Document

<!DOCTYPE html>
<html>
<head>
  <!-- HTML head -->
</head>
<body>
  <!-- HTML body -->
</body>
</html>

Comment

<!--
-->

Line feed

<br/>

Header and Paragraph

<h3></h3>
<p>
</p>

Show and Hide Details

<details>
  <summary></summary>
    <p>
    </p>
</details>

Preformated Text

<pre>
</pre>

List

<ul>
  <li>∙</li>
  <li>∙</li>
</ul>

<ol>
  <li>∙</li>
  <li>∙</li>
</ol>

Directory List

<dl>
  <dt></dt>
  <dd></dd>
</dl>

Hyperlink

<a href=""></a>
<a href="" target=""></a>
<a href="" target="" title=""></a>

<a href="?Category=&Page=" target=""></a>
<a href="?Category=&Page=" target="" title=""></a>
<a href="/User/?Category=&Page=" target=""></a>

Image

<img src="" width="" height="">

Audio

<audio id="myAudio"  style="max-width:100%" controls autoplay>
  <source src="" type="audio/mp3">
</audio>

Video

<video id="myVideo"  style="max-width:100%" controls autoplay>
  <source src="">
</video>

Table

<table>
  <tr>
    <td></td>
    <td></td>
  </tr>
</table>

<table border="0" width="100%">
  <colgroup>
    <col width="4*">
    <col width="2*">
    <col width="1*">
  </colgroup>
  <tr>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
  </tr>
</table>

Flex Box

<style type="text/css">

.flex-container {
        display: -webkit-flex;
        display: flex;
        /* float: left; */
}

.flex-item {
        /* padding:2px; */
        padding-left: 16px;
        padding-right: 16px;
        /*margin: 16px 0px 0px 0px;
         margin: 1em; margin-left: 0px; margin-right: 0px;
        margin: */
        /* border-radius: 0.5em; */
        box-shadow: inset -2px -2px 10px #ccc;
        border: 1px solid #999;
}

.flex1 {
        /* margin-right: 10px; */
        -webkit-flex: 1 1 25em;
        flex-grow: 1;
        flex-shrink: 1;
        flex-basis: 70%;
        background: white;
}

.flex2 {
        margin-left: 10px;
        -webkit-flex: 2 2 25em;
        flex-grow: 1;
        flex-shrink: 2;
        flex-basis: 30%;
        background: white;
}
</style>

<div class="flex-container">

<div class="flex-item flex1">
  <h4></h4>
<pre>

</pre>
</div>

</div>

<div class="flex-container">

<div class="flex-item flex1">
  <h4></h4>
<pre>

</pre>
</div>

<div class="flex-item flex2">
  <h3></h3>
<pre>

</pre>
</div>

</div>



Box 1 Head

Box 1 body.


Box 2 Head

Box 2 body.


Box 3.1 Head

Box 3.1 body.

Box 3.2

Box 3.2 body.