Site validation throws an error: there is no attribute “DATA-BG”
Question
Validating my website under development, which can be viewed here , I'm receiving the error message: Line 92, Column 32: there is no attribute "DATA-BG". I'm using data-attributes like this throughout my site:
<div class="sbi_panel" data-bg="slider/images/4.jpg">
So, the data-bg attibute is not recognised. I'd like to know what is wrong here?
2 answers
solution1
2 2012-08-26 00:29:09
The problem is your DOCTYPE , which is currently set as:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
The W3C validator looks at the DOCTYPE declaration when determining what type of validation to perform. HTML attributes that begin data- are an HTML5 idea, so you'll need to change your DOCTYPE to HTML5 so it validates as correct.
solution2
0 2012-08-26 07:22:30
The data- attributes are not allowed according to HTML 4.01 doctype, or any a published doctype, This has no impact on their functionality; it is just a syntactic matter.
Options:
- Just ignore the message. This gets impractical if you have loads of such attributes, because then the amount of these messages makes it difficult to detect real markup errors.
- Construct a custom DTD that allows the
data-attribute(s) that you are using. The W3C shouts against the idea , but the real problem with it is that most people don't want to get involved in DTDs, and it takes some learning to edit a DTD. In this case, you would just add your attribute(s) to thecoreattrsattributes. You would need to add eachdata-attribute separately. - Change to the HTML5 doctype statement,
<!doctype html>. This make alldata-attributes allowed, but it also implies restrictions in other areas. HTML5 is not a pure extension on HTML 4.01; for example, it declares most kinds ofmetatags invalid (and although mostmetatags are useless, you may have some that are useful but not allowed in HTML5 at present).
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