CSS3 User Interface

CSS3 has new user interface features such as resizing elements, outlines, and box sizing.

In this chapter you will learn about the following user interface properties:

resize
outline-offset

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Numbers followed by -webkit- or -moz- specify the first version that worked with a prefix.

Property
resize	4.0	Not supported	5.0 4.0 -moz-	4.0	15.0
outline-offset	4.0	Not supported	5.0 4.0 -moz-	4.0	9.5

CSS3 Resizing

The resize property specifies whether or not an element should be resizable by the user.

This div element is resizable by the user (works in Chrome, Firefox, Safari and Opera).

The following example lets the user resize only the width of a <div> element:

Example

div {
resize: horizontal;
overflow: auto;
}

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The following example lets the user resize only the height of a <div> element:

Example

div {
resize: vertical;
overflow: auto;
}

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The following example lets the user resize both the height and the width of a <div> element:

Example

div {
resize: both;
overflow: auto;
}

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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 three ways:

An outline is a line drawn around elements, outside the border edge
An outline does not take up space
An outline may be non-rectangular

This div has an outline 15px outside the border edge.

The following example uses the outline-offset property to add a 15px space between the border and the outline:

Example

div {
    border: 1px solid black;
    outline: 1px solid red;
    outline-offset: 15px;
}

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