These attributes are useful for several input types such as number, range, date and time (and other variants).
The min and max attributes are used to set ranges to input fields that accept numerical values or a date/time.
Their detailed use with these input fields have already been explained in section 5.4 of this course dedicated to these particular input field types.
<input id="mydate" name="mydate"
type="date"
min="2012-01-01"
max="2013-01-01"
value="2012-01-01"
/>
<input name="time" id="time" type="time"
min="09:00"
max="17:00"
value="12:00"
/>
<input id="range" name="range" type="range" min="0" max="100" step="5"/>