A drop-down list with three visible options:
The size attribute specifies the number of visible options in a drop-down list.
If the value of the size attribute is greater than 1, but lower than the total number of options in the list, the browser will add a scroll bar to indicate that there are more options to view.
Note: In Chrome and Safari, this attribute may not work as expected for size="2" and size="3".
|number||The number of visible options in the drop-down list. Default value is 1. If the multiple attribute is present, the default value is 4|