CSS3 User Interface

CSS3 User Interface

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CSS3 User Interface

In CSS3, some of the new user interface features are resizing elements, box sizing, and outlining.
In this chapter you will learn about the following user interface properties:

• resize
• box-sizing
• outline-offset

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Browser Support

Property	Browser Support
resize
box-sizing
outline-offset

The resize property is supported in Firefox, Chrome, and Safari.
The box-sizing is supported in Internet Explorer, Chrome, Safari, and Opera. Firefox requires the prefix -moz-.
The outline-offset property is supported in all major browsers, except Internet Explorer.

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CSS3 Resizing

In CSS3, the resize property specifies whether or not an element should be resizable by the user.

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

The CSS code is as follows:

Example

Specify that a div element should be resizable by the user:

div
{
resize:both;
overflow:auto;
}

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CSS3 Box Sizing

The box-sizing property allows you to define certain elements to fit an area in a certain way:

Example

Specify two bordered boxes side by side:

div
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
width:50%;
float:left;
}

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CSS3 Outline Offset

The outline-offset property offsets an outline, and draws it beyond the border edge.
Outlines differ from borders in two ways:

• Outlines do not take up space
• Outlines may be non-rectangular

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

The CSS code is as follows:

Example

Specify an outline 15px outside the border edge:

div
{
border:2px solid black;
outline:2px solid red;
outline-offset:15px;
}