From W3C Wiki
The color state represents a color well control, for setting the element's value to a string representing a simple color.
- In this state, there is always a color picked, and there is no way to set the value to the empty string.
- The value attribute, if specified, must have a value that is a valid simple color.
autocomplete= on/ off/ default
The on state indicates that the value is not particularly sensitive and the user can expect to be able to rely on his user agent to remember values he has entered for that control.
The off state indicates either that the control's input data is particularly sensitive (for example the activation code for a nuclear weapon); or that it is a value that will never be reused (for example a one-time-key for a bank login) and the user will therefore have to explicitly enter the data each time, instead of being able to rely on the UA to prefill the value for him; or that the document provides its own autocomplete mechanism and does not want the user agent to provide autocompletion values.
The default state indicates that the user agent is to use the autocomplete attribute on the element's form owner instead. (By default, the autocomplete attribute of form elements is in the on state.)
list= ID reference
Identify an element that lists predefined options suggested to the user.
If present, its value must be the ID of a datalist element in the same document.
Gives the name of the input element.
Gives the default value of the input element.
<label>Select Color: <input type="color" name="selectcolor"></label>
The HTML5 specification defines the Color state in 220.127.116.11.15 COLOR STATE.