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CSS3 has new user interface features such as resizing elements, outlines, and box sizing. The resize property specifies whether or not an element should be resizable by the user.
The following example lets the user resize only the width of a <div> element, as
div {
resize: horizontal;
overflow: auto;
}
The following example lets the user resize only the height of a <div> element, as
div {
resize: vertical;
overflow: auto;
}
The following example lets the user resize both the height and the width of a <div> element, as
div {
resize: both;
overflow: auto;
}
CSS3 Outline Offset
The outline-offset property adds space between an outline and the edge or border of an element.
Outlines differ from borders in two ways
- An outline is a line drawn around elements, outside the border edge
- A outline do not take up space
- An outline may be non-rectangular
The following example uses the outline-offset property to add a 15px space between the border and the outline, as
div {
border: 1px solid black;
outline: 1px solid red;
outline-offset: 15px;
}
CSS3 User Interface Properties
The following table lists all the user interface properties
| Property | Description |
| box-sizing | Allows you to include the padding and border in an element’s total width and height |
| nav-down | Specifies where to navigate when using the arrow-down navigation key |
| nav-index | Specifies the tabbing order for an element |
| nav-left | Specifies where to navigate when using the arrow-left navigation key |
| nav-right | Specifies where to navigate when using the arrow-right navigation key |
| nav-up | Specifies where to navigate when using the arrow-up navigation key |
| outline-offset | Adds space between an outline and the edge or border of an element |
| resize | Specifies whether or not an element is resizable by the user |
