Andrew Andrew - 2 months ago 67
CSS Question

Replacing H1 text with a logo image: best method for SEO and accessibility?

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.

Answer

You're missing the option:

<h1>
  <a href="http://stackoverflow.com">
    <img src="logo.png" alt="Stack Overflow" />
  </a>
</h1>
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