将H1文本替换为徽标图片：SEO和辅助功能的最佳方法？ [英] Replacing H1 text with a logo image: best method for SEO and accessibility?

问题描述

似乎有一些不同的技术，所以我希望得到一个确定的答案这个...

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，同时最好地优化搜索引擎，屏幕阅读器，IE 6+和禁用CSS和/或图像的浏览器。

示例一：不使用h1标记。对于SEO不好，对吗？

 < div id =logo> 
< a href => 
< img src =logo.pngalt =Stack Overflow/> 
< / a> 
< / div> 
  

示例二：找到这里。 CSS似乎有点怪。

 < 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，不同的方法使用文本缩进。这是图片替换的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; / *大于实际图像？ * / 
 height：120px; 
 text-decoration：none; 
 border：0; 
} 
  
 示例四：  Leahy-Langridge-Jefferies方法。 
 < h1 id =logoclass =logo> 
< a href => Stack Overflow< / a> 
< / h1> 
  
 
 
 
  / * css * 
 h1.logo {
 margin-top：15px; / *为这个特定的网站，设置为你喜欢* / 
 position：relative; / *允许子元素放置在wrt这一个* / 
 overflow：hidden; / *不要让内容泄漏超出头 - 不需要作为锚的高度将覆盖整个头* / 
 padding：0; / *需要计算复位/默认样式* / 
} 
 
 h1.logo a {
 position：absolute; / *默认为top：0，left：0，所以可以省略* / 
 height：0; / *隐藏文本，防止它突出* / 
 width：100％; / * 686px;填充父元素* / 
 background-position：left top; 
 background-repeat：no-repeat; 
} 
 
 h1＃logo {
 height：60px; / *替换图像的高度* / 
} 
 
 h1＃logo a {
 padding-top：60px; / *替换图像的高度* / 
 background-image：url（logo.png）; / *替换镜像* / 
} 
  
事情？请在您的答案中提供html和css。
解决方案
您缺少该选项：
 < h1> 
< a href =http://stackoverflow.com> 
< img src =logo.pngalt =Stack Overflow/> 
< / a> 
< / h1> 
  
 
It seems like there are a few different techniques out there, so I was hoping to get a "definitive" answer on this...

On a website, it's common practice to create a logo that links to the homepage. I want to do the same, while best optimizing for search engines, screen readers, IE 6+, and browsers who have disabled CSS and/or images.

Example One: Doesn't use an h1 tag. Not as good for SEO, right?
<div id="logo">
    <a href="">
        <img src="logo.png" alt="Stack Overflow" />
    </a>
</div>
Example Two: Found this somewhere. The CSS seems a little hacky.
<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;
}
Example Three: Same HTML, different approach using text-indent. This is the "Phark" approach to image replacement.
<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;
}
Example Four: The Leahy-Langridge-Jefferies method. Displays when images and/or css is turned off.
<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 */
}
What method is the best for this sort of thing? Please provide html and css in your answer.
解决方案
You're missing the option:
<h1>
  <a href="http://stackoverflow.com">
    <img src="logo.png" alt="Stack Overflow" />
  </a>
</h1>


                        
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