似乎那里有几种不同的技术,所以我希望对此有一个“明确的”答案...
在网站上,通常的做法是创建一个链接到首页的徽标。我想做同样的事情,同时针对搜索引擎,屏幕阅读器,IE 6+和禁用CSS和/或图像的浏览器进行最佳优化。
示例一:不使用h1标签。对SEO不好,对吗?
<div id="logo">
<a href="">
<img src="logo.png" alt="Stack Overflow" />
</a>
</div>
示例二:在某处找到它。CSS似乎有点骇人听闻。
<h1 id="logo">
<a href="">Stack Overflow</a>
</h1>
/* css */
#logo {
padding: 70px 0 0 0;
overflow: hidden;
background-image: url("logo.png");
background-repeat: no-repeat;
height: 0px !important;
height /**/:70px;
}
示例三:相同的HTML,使用text-indent的不同方法。这是图像替换的“ Phark”方法。
<h1 id="logo">
<a href="">Stack Overflow</a>
</h1>
/* css */
#logo {
background: transparent url("logo.png") no-repeat scroll 0% 0%;
width: 250px;
height: 70px;
text-indent: -3333px;
border: 0;
margin: 0;
}
#logo a {
display: block;
width: 280px; /* larger than actual image? */
height: 120px;
text-decoration: none;
border: 0;
}
示例四: Leahy-Langridge-Jefferies方法。当图像和/或css关闭时显示。
<h1 id="logo" class="logo">
<a href="">Stack Overflow</a>
</h1>
/* css */
h1.logo {
margin-top: 15px; /* for this particular site, set this as you like */
position: relative; /* allows child element to be placed positioned wrt this one */
overflow:hidden; /* don’t let content leak beyond the header - not needed as height of anchor will cover whole header */
padding: 0; /* needed to counter the reset/default styles */
}
h1.logo a {
position: absolute; /* defaults to top:0, left:0 and so these can be left out */
height: 0; /* hiding text, prevent it peaking out */
width: 100%; /* 686px; fill the parent element */
background-position: left top;
background-repeat: no-repeat;
}
h1#logo {
height: 60px; /* height of replacement image */
}
h1#logo a {
padding-top: 60px; /* height of the replacement image */
background-image: url("logo.png"); /* the replacement image */
}
哪种方法最适合这种事情?请在回答中提供HTML和CSS。
title
属性不是应该在<a>
吗?