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| <style type="text/css">
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| body {background-color: red}
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| p {margin-left: 20px}
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| </style>
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| </head>
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| <table border="1">
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| <tr>
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| <td>row 1, cell 1</td>
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| <td>row 1, cell 2</td>
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| <tr>
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| <td></td>
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| <td>row 2, cell 2</td>
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| <!DOCTYPE html>
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| <html>
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| <head>
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| <style>
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| .cities {
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| background-color:black;
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| color:white;
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| margin:20px;
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| padding:20px;
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| }
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| </style>
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| </head>
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| <body>
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| <div class="cities">
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| <h2>London</h2>
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| <p>
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| London is the capital city of England.
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| It is the most populous city in the United Kingdom,
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| with a metropolitan area of over 13 million inhabitants.
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| </p>
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| </div>
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| </html>
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| <!DOCTYPE html>
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| <html>
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| <style>
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| .cities {
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| background-color:black;
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| color:white;
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| margin:20px;
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| padding:20px;
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| </style>
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| </head>
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| <body>
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| <div class="cities">
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| <h2>London</h2>
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| <p>London is the capital city of England.
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| It is the most populous city in the United Kingdom,
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| with a metropolitan area of over 13 million inhabitants.</p>
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| </div>
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| <div class="cities">
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| <h2>Paris</h2>
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| <p>Paris is the capital and most populous city of France.</p>
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| </div>
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| <div class="cities">
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| <h2>Tokyo</h2>
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| <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
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| and the most populous metropolitan area in the world.</p>
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| </div>
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| <!DOCTYPE html>
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| <html>
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| <head>
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| <style>
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| #header {
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| background-color:black;
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| color:white;
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| text-align:center;
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| padding:5px;
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| }
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| #nav {
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| line-height:30px;
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| background-color:#eeeeee;
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| height:300px;
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| width:100px;
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| float:left;
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| padding:5px;
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| }
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| #section {
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| width:350px;
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| float:left;
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| padding:10px;
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| }
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| #footer {
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| background-color:black;
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| color:white;
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| clear:both;
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| text-align:center;
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| padding:5px;
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| }
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| </style>
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| </head>
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| <body>
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| <div id="header">
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| <h1>City Gallery</h1>
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| </div>
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| <div id="nav">
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| London<br>
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| Paris<br>
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| Tokyo<br>
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| </div>
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| <div id="section">
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| <h2>London</h2>
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| <p>
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| London is the capital city of England. It is the most populous city in the United Kingdom,
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| with a metropolitan area of over 13 million inhabitants.
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| </p>
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| <p>
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| Standing on the River Thames, London has been a major settlement for two millennia,
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| its history going back to its founding by the Romans, who named it Londinium.
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| </p>
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| </div>
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| <div id="footer">
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| Copyright ? W3Schools.com
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| </div>
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| </body>
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| </html>
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| <!DOCTYPE html>
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| <html lang="en-US">
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| <head>
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| <style>
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| .city {
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| float: left;
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| margin: 5px;
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| padding: 15px;
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| width: 300px;
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| height: 300px;
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| border: 1px solid black;
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| }
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| </style>
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| </head>
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| <body>
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| <h1>W3School Demo</h1>
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| <h2>Resize this responsive page!</h2>
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| <br>
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| <div class="city">
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| <h2>London</h2>
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| <p>London is the capital city of England.</p>
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| <p>It is the most populous city in the United Kingdom,
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| with a metropolitan area of over 13 million inhabitants.</p>
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| </div>
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| <div class="city">
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| <h2>Paris</h2>
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| <p>Paris is the capital and most populous city of France.</p>
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| </div>
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| <div class="city">
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| <h2>Tokyo</h2>
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| <p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
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| and the most populous metropolitan area in the world.</p>
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| </div>
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| </body>
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| </html>
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| <!DOCTYPE html>
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| <html>
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| <body>
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| <video width="320" height="240" controls="controls" autoplay="autoplay">
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| <source src="/i/movie.ogg" type="video/ogg" />
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| <source src="/i/movie.mp4" type="video/mp4" />
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| <source src="/i/movie.webm" type="video/webm" />
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| <object data="/i/movie.mp4" width="320" height="240">
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| <embed width="320" height="240" src="/i/movie.swf" />
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| </object>
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| </video>
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| </body>
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| </html>
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| <!DOCTYPE html>
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| <html>
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| <head>
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| <style>
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| body {
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| margin: 0;
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| }
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| ul {
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| list-style-type: none;
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| margin: 0;
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| padding: 0;
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| width: 25%;
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| background-color: #f1f1f1;
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| position: fixed;
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| height: 100%;
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| overflow: auto;
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| }
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| li a {
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| display: block;
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| color: #000;
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| padding: 8px 16px;
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| text-decoration: none;
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| }
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| li a.active {
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| background-color: #4CAF50;
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| color: white;
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| }
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| li a:hover:not(.active) {
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| background-color: #555;
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| color: white;
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| }
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| </style>
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| </head>
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| <body>
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|
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| <ul>
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| <li><a class="active" href="#home">Home</a></li>
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| <li><a href="#news">News</a></li>
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| <li><a href="#contact">Contact</a></li>
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| <li><a href="#about">About</a></li>
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| </ul>
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|
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| <div style="margin-left:25%;padding:1px 16px;height:1000px;">
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| <h1>全高的固定侧导航栏</h1>
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| <h2>请尝试滚动此区域，并查看 sidenav 如何粘在页面上。</h2>
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| <p>请注意，此 div 元素的左外边距为 25％。这是因为侧导航栏被设置为 25％ 宽。如果删除这个外边距，则 sidenav 将叠加到该 div 上。</p>
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| <p>还要注意，我们已为 sidenav 设置 overflow：auto。如果 sidenav 太长时（例如，如果其中有超过 50 个链接），会添加滚动条。</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| <p>Some text..</p>
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| </div>
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|
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| </body>
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| </html>
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不畏浮云遮望眼，自缘身在最高层
- 数字列表也不错
- 很整齐
- 容易理解
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5.8mm机枪弹
5.8毫米机枪弹系列
5.8毫米机枪弹有4种型号,但实际上仅有机枪弹和曳光弹2种,分别是88/88A式5.8毫米机枪弹、88/88A式5.8毫米机枪曳光弹。.相比5.8毫米普通弹,5.8毫米机枪弹的主要区别是弹头要重一些,5.8毫米普通弹的弹头重为4.15克,而5.8毫米机枪弹的弹头重则达到了4.8克,因此也被称为5.8毫米重弹。
5.8毫米机枪弹的研制工作是与87式5.8毫米普通弹同步开始的,不过早期的方案并不是5.8毫米，期间的波折要比5.8毫米普通弹大得多。根据1971年3月召开的"71.3”会议精神，机枪的小口径化工作同步展开,最初选定的口径为6.8毫米，经过6年时间的研究和研制工作,同步研制出了6.8毫米的通用机枪，还完成了设计定型试验和寒区部队试验，但因要增加口径,会使装备保障更加复杂,最终于1979年决定停止项目。此后又经多年研究和探索,直至1988年，以5.8毫米口径为基础的重弹研究取得了重大突破后，机枪弹的研制工作才开始正式启动。
88式5.8毫米机枪弹的研制围绕着5.8毫米通用机枪和5.8毫米狙击步枪同步进行,采用长尾锥、双弧形弹头外形，硬钢心加厚底铅套的弹头结构，较好地解决了威力、散布密集度等技术难题。在研制过程中，最初采用的方案为铜被甲方案,即弹头壳由黄铜材料制成,弹壳和底火与95式5.8毫米普通弹相同。1994年,在进行通用机枪可靠性试验中,发现在机枪的枪管膛线和导气孔位置有挂铜现象,为解决此问题,研制单位同步开展了覆铜钢弹头壳方案的研制工作。1995年底 ,两种被甲的机枪弹同时通过了基地设计定型试验考核,在批复定型时，两种方案分别被命名DVP88式5.8毫米机枪弹(铜被甲弹头)和DVP88A式5.8毫米机枪弹(覆铜被甲弹头)。但最后生产时, DVP88式5.8毫米机枪弹的数量相对较少,常见的是覆铜.被甲弹头的DVP88A式5.8毫米机枪弹。
88式5.8毫米机枪弹是88式狙击步枪和通用机枪的主用弹种,必要时也可用于95式/03式步枪.95B式5.8毫米短步枪和95式5.8毫米班用机枪使用。两种被甲的机枪弹性能基本相同:初速890米/秒,全弹重13克，弹头重4.8克,配用88式5.8毫米狙击.步枪使用时,用来杀伤800米内有生目标，配用88式5.8毫米通用机枪使用时，用于杀伤和压制1000米内集群目标。
5.8毫米机枪曳光弹研制工作于1998年正式启动,也有两种型号，主要与两家生产单位有关。2001年，两种曳光弹同时完成设计定型,分别被命名为DVX88式5.8毫米机枪曳光弹和.DVX88A式5.8毫米机枪曳光弹。其中DVX88式5.8毫米机枪曳光弹采用曳光管壳底部冲孔的结构，结构较为紧凑,其它与88式5.8毫米机枪弹相同;DVX88A式5.8毫米机枪曳光弹采用铅心、曳光管、曳光垫顺序排列的方式,弹壳和底火与95A式5.8毫米普通弹相同。88式5.8毫米机枪曳光弹与88式5.8毫米机枪弹配合使用,用于指示和修正弹道。后因生产安排的原因，见到较多的是DVX88A式5.8毫米机枪曳光弹，而DVX88式5.8毫米机枪曳光弹相对较少。
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