Custom Attribute on HTML Element

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+4 Q:

Custom Attribute on HTML Element

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What are the drawbacks of adding a custom attribute on a standard HTML element?

For example:
<intput type="textbox" id="MyId" MyCustomeAttribute="MyData" />

By adding the MyCustomAttribute, I've made the document invalid, but what are the actual implecations? What problems, if any, will this cause?

I'd be using Javascript to read the values of the custom attributes.

Thanks

It may cause compatibility problems sooner or later.

Rather prefix the attribute name with data-, e.g. data-MyCustomeAttribute. There it is for.

BalusC 2010-03-10 15:18:25

+4 A:

The drawback is that you can't use validation tools, because they'll complain about an "inavlid" attribute.

HTML5 provides a way for us to do this validly, though (huzzah!): Use the prefix data- for your own attributes, e.g., data-mycustomattribute. And it works today in all major browsers.

T.J. Crowder 2010-03-10 15:18:38

Usually most browser ignore attiributes they can't understand. However there should be another way to do what you are trying to do with a valid markup

Sinan 2010-03-10 15:19:35

I believe it's part of the spec for HTML5 and should therefor validate using a <html> doctype. But as we all know HTML5 is not fully implemented yet across browsers so you your going to have to wait a while for it to validate

Nick Allen - Tungle139 2010-03-10 15:19:43

You can combine validatability and customizability if you start from an xml source, with your own dtd, and transform it to (valid) html with your javascript.

xtofl 2010-03-10 15:22:12

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Custom Attribute on HTML Element

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