Valid HTML Guide

I went to a lots of fan sites, most of then does't have valid (X)HTML. According to my reserach, I found some common errors:

Error How to solve
Ampersand in URL/texts use & instead of just &
Double quotes in URL/texts use " instead of just "
Self-closed tags use <br /> or <img src='' alt='' /> instead of <br > or <img src='' alt='' >
Images(and many other replaced elements) missing alt attribute add alt attribute to images(read more)
< and/or > in <script>s and <style>s Add <!-- and --> on the first/last comments to treat scripts/styles as comments.(read more)
Example:
<script type='text/javascript'>
//<!--
if (a < b)
{
return true;
}
//-->
</script>
<style type='text/css'>
/*<!--*/
body > p
{
font-family: Consolas,monospace;
}
/*-->*/
</style>
Missing type attribute in <script>s and <style>s For JavaScript tags, add type='text/javascript' in attributtes and remove language='JavaScript'. For CSS tags, add the type='text/css' attributes.
Here's what it should look like: <script type='text/javascript'>
//<!--
if (a < b)
{
return true;
}
//-->
</script>
<style type='text/css'>
/*<!--*/
body > p
{
font-family: Consolas,monospace;
}
/*-->*/
</style>

There may be more, I found there's a site from W3C has more tips:

http://www.w3.org/QA/Tips/


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