Remove 'data' prefix from attributes

[rhutchison]

Remove the 'data' prefix from custom attributes.

[lirantal]

@ilanbiala per your request...

[trainerbill]

Doesn't this go against HTML validation standards? data- is supposed to be included anytime you have a custom attribute not defined by W3C. I like the data-

[codydaig]

@trainerbill The angular style guide that I personally refer back too (and I think it's been mentioned before in a previous issue) never even references using data-. I'm not familiar with how it plans into validation standards though.
https://github.com/johnpapa/angular-styleguide

[lirantal]

ng-submit kind of custom attribute is probably not valid by W3C, but the data-ng-submit is valid. I'm not sure what reasons did @ilanbiala had about removing it

[pgrodrigues]

Personally, Im going to keep data- prefixes in my apps due to W3C validation tests and also to avoid future HTML browser implementations that might create conflicts with ng- attrs which I'm pretty sure there won't be any, but from my point of view it's safer and since it is defined in the HTML5 spec why not keep them? :D

[lirantal]

yeah I'm not sure why we removed it, need to wait for Ilan's response here

[ilanbiala]

Data- was just to comply with XHTML IIRC. HTML5 allows all kinds of custom attributes if I'm not mistaken and syntax highlighters will work with either one. data- also just adds extra characters and makes everything longer. Anyway Some Angular HTML sometimes doesn't pass through W3C (and we know that isn't what necessarily makes a page better), so I don't see why we should try to conform more towards it.

[lirantal]

HTML5 is also strict about the attributes type and it would prefer a data-* over plain custom.
Since AngularJS normalizes those attribute names I don't think it's worth any hassle to remove the data-* version that we have.

Unless there's a strong argument in removing data-* I think we can close this PR.

[ilanbiala]

@lirantal I don't really care, but we shouldn't be inconsistent and I see no reason to do data- when almost no one does.

[lirantal]

I haven't seen a strong argument towards removing data-* attributes so I'm not 100% convinced about removing it.

[codydaig]

LGTM :-D
👍