刚才到W3C网站验证了一下www.geniusy.com，
网站竟然起初有100多处错误，其中有些是由于疏忽导致的，比如多了</p></strong>标记，有<li>而
之前没有<ul>或<ol>等，不过有些就是由于以前不清楚标准导致的，比如<img>必须包含alt说明等。
不过查出来错误最多的还是Sablog的JS调用标签，一段标签都N个错误，看来得避免使用JS调用啊。下面是找来的最容易出现的错误：
| HTML Tag | Error | PSU Pilot Frequency |
| <img>, <area> |
Required attribute ALT not specified |
29.9% |
| <table>, <tr>, <th>, <td> |
There is no attribute BGCOLOR | HEIGHT | WIDTH | ALIGN |
10% |
| <ul>, <ol> |
Start tag for "LI" omitted, but its declaration does not permit this |
8.6% |
| Any HTML tag |
Document type does not allow element <tag> here |
6.2% |
| <font> |
Element "FONT" is undefined |
4.5% |
| The align attribute on any tag |
There is no attribute "ALIGN" |
3.8% |
| <script>, <style> |
There are three commons types of errors on these tags:
- There is no attribute "LANGUAGE"
- Required attribute "TYPE" not specified
- Many strange markup errors occurring within a <script> or <style> element
|
3.5% |
| All HTML tags |
End tag for <tag> omitted, but OMITTAG NO was specified. |
3.4% |
| Page content and all tags using URLs in attribute values |
This error can be presented several ways, based on the validator being used, such as:
- Cannot generate system identifier for general entity "variable"
- General entity "variable" not defined and no default entity
- Reference to entity "variable" for which no system identifier could be generated
- Invalid entry was found in the value for the "href" or "src" attribute
- Character "&" is the first character of a delimiter but occurred as data
|
3.4% |
| Any attribute value on any tag |
An attribute value must be a literal unless it contains only name characters |
3.3% |
| Any series of tags |
End tag for "tag1" omitted, but OMITTAG NO was specified - AND - End tag for "tag2" which is not open |
3.0% |
| <body> |
There is no attribute:
- bgcolor
- text
- bgcolor
- link
- vlink
- alink
|
2.9% |
| <b>, <i> |
- Use <strong> rather than <b> for emphasis
- Use <em> rather than <i> for emphasis
|
2.8% |
| <!DOCTYPE> |
DOCTYPE errors can be found in the following forms:
- No DOCTYPE found!
- No document type declaration; implying "<!DOCTYPE HTML SYSTEM>"
- Unknown parse mode
- DOCTYPE is not a recognized DOCTYPE and may not be valid
|
2.4% |
| Content: &128;-&159; |
Found an illegal character reference or Character "&" is the first character of a delimiter but occurred as data |
1.8% |
| <hr> |
align, noshade, size, and width attributes for <hr> are all deprecated in favor of style sheets |
1.3% |
| <ul>, <ol>, <li> |
This error can appear in multiple ways, depended on the validator and the context in which it is contained:
- Document type does not allow element "ul" or "ol" here; assuming missing "li" or "ol" start-tag
- Document type does not allow element "li" here; missing one of "ul", "ol", "menu", "dir" start-tag
- End tag for "li" omitted, but OMITTAG NO was specified
- Nested lists should be contained in an "li" tag
|
1.1% |
| <img> |
height and width attributes should be used with the <img> element |
1.0% |
| <body> |
Document type does not allow element "body" here |
0.4% |
| id and name attribute on any tag |
ID or name attribute already defined |
0.2% |
| <center> |
<center> is deprecated |
0.1% |
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