AngularJS gives the option of, but does not use the data- prefix in their examples or mandate the use of it. Should I include the data- prefix in my project and why?
Is it still valid HTML if I don't use data-*?
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Not a constructive question but an opinion poll. To make the question constructive, you should present the question more clearly (what exactly are you using) and specify the criteria to be applied. – Jukka K. Korpela Jun 13 '13 at 16:27
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Many libraries like knockout, angular etc. do not use the data- prefix.
Knockout uses data-*: "<span data-bind="text: myMessage">"
Angular uses data-*: "the directive can be prefixed with x-, or data- to make it HTML validator compliant" (shame they don't understand that it is for compliance with HTML and not with the validator).
Should i include the data- prefix ?
Yes, you should write valid HTML. If you are making up attributes, use data- ones.
Quentin
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3They probably don't care, but until you become one of them - use the data attributes. – Shomz Jun 13 '13 at 16:09