I have noticed that the “rel” attribute is not used at all by browsers, does this make it an ideal place to store additional information for javascript (eg a delete ajax request could read the id from rel)
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You noticed wrong. Browsers do make use of it (e.g. some browsers have a keyboard shortcut to go to the next page and can use the rel attribute to determine that that is). Search engines also make use of it (e.g. nofollow).
No. Attributes have specified purposes. Don’t assume that they aren’t going to be used for that.