Widget generator doesn't match Modernizr feature detection

[akavlie]

A lot of the features that the widget generator (at api.html5please.com) suggests are not recognized by Modernizr. Examples:

• css-sel2
• css3-boxsizing
• mathml
• datalist

[paulirish]

modernizr has tests for boxsizing, mathml and datalist

they are all in here https://github.com/Modernizr/Modernizr/tree/master/feature-detects

selectors2 on the other hand, nope.

[nimbupani]

likely just need the right mapping in our json file.

[paulirish]

yah