New HTML5 input attributes
There are new attributes for the input tag that was not previously in HTML4. For example, in HTML 5 you can have …
<input type=”text” name=”postaladdress” required=”off” >
where autocomplete is an new attribute in HTML5.
The attributes of the input tag that are new in HTML5 are …
autocomplete
autofocus
required
form
formaction
formmethod
formtarget
formenctype
formnovalidate
height
width
max
min
placeholder
list
pattern
step
See also new HTML5 input type values and new HTML5 tags and discontinued HTML5 elements.
For reference for the attributes for the input tag including the new ones for HTML5, you can see w3schools.com