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HTML5 is designed with extensibility in mind for data that should be associated with a particular element but need not have any defined meaning. data-* attributes allow us to store extra information on standard, semantic HTML elements without other hacks such as classList, non-standard attributes, extra properties on DOM, or setUserData.
Using data attributes 
Added 3 years ago by John Caserta
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Using data attributes 
Info
HTML5 is designed with extensibility in mind for data that should be associated with a particular element but need not have any defined meaning. data-* attributes allow us to store extra information on standard, semantic HTML elements without other hacks such as classList, non-standard attributes, extra properties on DOM, or setUserData.
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