"type" attribute lowercasing not always desirable

[kabukky]

According to https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes the "type" attribute is only specified for <button>, <input>, <command>, <embed>, <object>, <script>, <source>, <style>, <menu>.

However, AMP are using the "type" attribute on <amp-analytics> as well.

We've run into issues where the "type" attribute value is case sensitive, specifically with the Adobe Analytics implementation: When using Minify, "adobeanalytics_nativeConfig" gets lowercased to "adobeanalytics_nativeconfig" which breaks the implementation.

Could you enable "type" attribute lowercasing only for specific HTML tags, e. g. the ones in the HTML spec?

[tdewolff]

See d843c10, 3f30656, 261d800 for the fix. This will fix a wider range of potential bugs by ensuring that only HTML5 element attributes are minified specially, following the Living HTML specification: https://html.spec.whatwg.org/