Rails3's form helpers are ready to HTML5 input types

On Agile Web Development with Rails 4th edition chapter21 (ActionView), I learn the fact that Rails3's form helpers are ready to HTML5.

Form helper of Rails3	Corresponding HTML5 input type
search_field	search
telephone_field	tel
url_field	url
email_field	email
number_field	number
range_field	range

There are no form helpers corresponding neither input types related with date or time, nor input type related with color ( type="color" ). I could understand date time ones will be integrated in helper methods like date_select in the future, but could not understand where is color form helper.

IMO, Opera browser is the most advanced browser implementing HTML5 input tag, so that you should check those form helpers on Opera browser.