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feature: dataset status: use tags: fallback gtie10 nooldmobile kind: api polyfillurls:HTML5 dataset support

elem.dataset is unsupported in Internet Explorer <= 10 and older mobile browsers. Using data-* attributes will be totally fine in all browsers, but instead of using elem.dataset.foo just use elem.getAttribute('data-foo'). A polyfill is available if you want terser syntax.