我是 HTML 编程新手，所以请耐心等待。为什么嵌入的 youtube 视频不显示？我在这里错过了什么吗？我还包含了 CSS 文件，以备不时之需，我很感激。
<!DOCTYPE html>
<html>
<head>
<link type="text/css" rel="stylesheet" href="stylesheet.css"/>
<title>Mysteries</title>
<meta charset="utf-8">
</head>
<html>
<body class="index">
<div id="header_box">
<h4 class="logo">MYSTERIES<span class="orange2">/</span>PARANORMAL</h4>
<a href="index2.html" id="content_link">CONTENT</a>
</div>
<div id="footer">
<h4><OKLAH/WEBSOFT> 2015 All Rights Reserved.</h4>
<div>
<iframe width="560" height="315" src="https://www.youtube.com/embed /Gas8f7dJfWc?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>
</body>
</html>
Here is the CSS Code for the webpage, please keep in mind im new to all this, so i might have some css errors in there
#header_box {
z-index: 1;
position: fixed;
background-color: rgba(255,255,255,0.25);
border: 1px solid #FFF;
width: 100%;
height: 22px;
left: -2px;
padding: 1em 1.5em;
padding-top: 1em;
padding-right: 1.5em;
padding-bottom: 1em;
padding-left: 1.5em;
top: 0px;
}
.index {
background: #000;
}
.logo {
color: white;
font-family: Verdana;
font-weight: 300px;
float: left;
padding-top: 0px;
margin-top: 0px;
font-size: 16px;
}
}
.orange2 {
color: #FF6600;
}
.orange {
color: #FF6600;
}
.h2 {
color: #FFF;
text-align: center;
padding-top: 10px;
font-family: ISOCT;
letter-spacing: 0.1em;
text-transform: uppercase;
}
img {
float: center;
width: 55px;
height: 50px;
padding-top: 70px;
display: block;
margin: auto;
}
p {
color: #FFF;
text-align: center;
font-family: ISOCT;
font-size: 20px;
}
#paranormal_cont {
color: #FFF;
font-family: Verdana;
float: right;
text-decoration: none;
margin-right: 20px;
}
#paranormal_cont:hover{
border: 1px;
border-style: dotted;
font-weight: bold;
color: #FF6600;
}
#content_link {
color: #FFF;
font-family: Verdana;
float: right;
text-decoration: none;
margin-right: 50px;
}
#content_link:hover {
border: 1px;
border-style: dotted;
font-weight: bold;
color: #FF6600;
}
#footer {
position: fixed;
bottom: 0px;
margin: 0;
padding: 0;
left: 0;
right: 0;
background-color: rgba(255,255,255,0.25);
border: 1px solid #FFF;
width: 100%;
height: 40px;
left: -1px;
}
#footer h4 {
position: relative;
text-align: left;
color: #FFF;
font-family: Verdana;
font-size: 14px;
font-weight: 300px;
margin-left: 10px;
margin-top: 10px;}
youtube 视频的 URL 中有一个空格。删除它。
更改此：
<iframe width="560" height="315" src="https://www.youtube.com/embed /Gas8f7dJfWc?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>对此：
<iframe width="560" height="315" src="https://www.youtube.com/embed/Gas8f7dJfWc?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>更新 您也没有关闭页脚。
我已经更新了小提琴： JSFiddle
问题是您忘记关闭 footer-div。这就是您没有看到 iframe 的原因。
此外，为了完整起见，提及它“更改链接，使其中没有空格”，尽管您已经将其排除为问题，因为您说过
其实原代码没有空格，所以链接是可以的， 还能是什么？
为了完整起见，这里有整个工作代码。
<!DOCTYPE html>
<html>
<head>
<link type="text/css" rel="stylesheet" href="stylesheet.css"/>
<title>Mysteries</title>
<meta charset="utf-8">
</head>
<html>
<body class="index">
<div id="header_box">
<h4 class="logo">MYSTERIES<span class="orange2">/</span>PARANORMAL</h4>
<a href="index2.html" id="content_link">CONTENT</a>
</div>
<div id="footer">
<h4><OKLAH/WEBSOFT> 2015 All Rights Reserved.</h4>
</div> <!-- You forgot to close this div -->
<iframe width="560" height="315" src="https://www.youtube.com/embed/Gas8f7dJfWc?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>
</body>
</html>
///// 以此为例 /////