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I was wondering if you can define your own attributes in HTML. For example in HTML divs there’s a range of attributes, such as style, title, class etc. Can you make up and add your own, while remaining syntactically correct?
For example: <div class="example" test_item="20"></div>
The need for this is with regards to Javascript and data.
With one exception — no. HTML uses the attributes and elements defined by the specification, and only those attributes and elements.
That exception is attributes with names starting
data-, and then only if you are following the HTML 5 draft.That said, it is often appropriate to encode the data in the
idorclassattribute.