How to use HTML5 data attributes
Back in the old XHTML/HTML4 days, developers had few options when storing arbitrary data associated with the DOM. You could invent your own attributes but that was risky; your code would be invalid, browsers could ignore the data, and it would cause problems if the name ever became a standard HTML attribute. Therefore, most developers relied on the class or rel attributes since these were the only ones which permitted reasonably flexible strings. Now, HTML5 introduces custom data attributes.
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