In html, often there will certainly be js, css introduction of
<head>
<title>MyHtml</title>
<link rel="stylesheet" type="text/css" href="/css/common.css"/>
<script type="text/javascript" src="/js/jquery.js"></script>
</head>
In the <link> in rel = "stylesheet" type = " text / css" and <script> in type = "text / javascript", each is the same. What is necessary? Or you can not write it?
The answer is: the introduction of css is a must have. (Rel = "stylesheet" tells the browser, link to come is a style, type = "text / css" represents the type = level / style, you do not say who knows ah ...)
Js and may be omitted (because JavaScript is the default scripting language as well as all modern HTML5 browsers!)