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

Browser Support

Property Browser Support
resize
box-sizing -moz- -webkit- -webkit-
outline-offset

The resize property is only supported in Chrome and Safari.

The box-sizing is supported in Internet Explorer and Opera. Firefox requires the prefix -moz-. Chrome and Safari require the prefix -webkit-.

The outline property is supported in all major browsers, except Internet Explorer.

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 Google Chrome and Safari).

The CSS code is :

Example

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

div
{
resize:both;
overflow:auto;
}


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 */
-webkit-box-sizing:border-box; /* Safari and Chrome */
width:50%;
float:left;
}


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 :

Example

Specify an outline 15px outside the border edge:

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


New User-interface Properties

Property Description CSS
appearance Allows you to make an element look like a standard user interface element 3
box-sizing Allows you to define certain elements to fit an area in a certain way 3
icon Provides the author the ability to style an element with an iconic equivalent 3
nav-down Specifies where to navigate when using the arrow-down navigation key 3
nav-index Specifies the tabbing order for an element 3
nav-left Specifies where to navigate when using the arrow-left navigation key 3
nav-right Specifies where to navigate when using the arrow-right navigation key 3
nav-up Specifies where to navigate when using the arrow-up navigation key 3
outline-offset Offsets an outline, and draws it beyond the border edge 3
resize Specifies whether or not an element is resizable by the user 3


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