In this chapter we are listing only HTML5 input element and new types, as well as form specific HTML5 attributes.

Check references for other HTML5 attributes:

Input types
TYPE DESCRIPTION
color allows user to choose color (trhough a color picker)
date allows to input a date (usually as a date picker)
datetime allows to input a date and time with the time zone
datetime-local allows to input a date and time with the time zone but in a local format
email allows only standard email format (with @)
month allows to input a week and a year (may be also presented as a date picker)
number permits users to input only numbers into the field
range defines permitted range of a number (usually as a slider)
search should be used to replace a externally scripted search model (depends on browsers support)
tel allows only standard telephone numbers format
time allows inputting a time (usually as a date picker)
url allows only standard URL format (http://...)
week allows inputting a week and a year (may be also presented as a date picker)

Form attributes
ATTRIBUTE DESCRIPTION ELEMENT(S)
autofocus specifies which form element receives the focus as the page loads <button>, <input />, <select>, <textarea>
autocomplete allows an auto complete options for the element <form>, <input/>
form explains to which form the specified attribute is associated with <button>, <fieldset>, <input />, <keygen>, <label>, <object> (non-form element), <output>, <select>, <textarea>
formaction used to allow an input (or a button) submit button to re-direct action to another location (by URL) <button>, <input />
formenctype used to allow an input (or a button) submit button to replace form set encoding with their own type <button>, <input />
formmethod used to allow an input (or a button) submit button to replace form set method with their own <button>, <input />
formnovalidate if set to "true", it ignores native HTML5 validations of form's input fields <button>, <input />
formtarget defines which frame or window the form will be executed at (same as target attribute) <button>, <input />
height defines the height of an element <embed>, <iframe>, <img />, <input />, <object>, <video>
list refers to the id of a <datalist> suggesting a list of values that may be used as that particular input field  <input />
max affects only numeric types (number, date...), and specifies a possible maximum value to be input <input />
min affects only numeric types (number, date...), and specifies a possible minimum value to be input <input />
multiple allows a form element to choose (select) more then one value at the time <input />, <select>
novalidate if set to "true", it ignores native HTML5 validations of form's fields that belong to that form element <form>
pattern validates the value of an input field against given regular expression statement <input />
placeholder for textual fields, it is used to visualized a default value that will disappear when an user enters a new one <input />, <textarea>
required requires a form field to have a value prior to submission <input />, <select>, <textarea>
step affects only numeric types (number, date...), and specifies an increase / decrease step after user's input (usually showed as up / down arrows next to a field) <input />
width defines the width of an element <embed>, <iframe>, <img />, <input />, <object>, <video>