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CSS User Interface

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CSS User Interface

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

  • resize
  • outline-offset

Browser Support

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

Property
resize 4.0 79.0 5.0 4.0 15.0
outline-offset 4.0 15.0 5.0 4.0 9.5

CSS Resizing

The resize property specifies if (and how) an element should be resizable by the user.

This div element is resizable by the user!

To resize: Click and drag the bottom right corner of this div element.

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 width of a <div> element:

Example

div {
  resize: both;
  overflow: auto;
}
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In many browsers, <textarea> is resizable by default. Here, we have used the resize property to disable the resizability:

Example

textarea {
  resize: none;
}
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CSS Outline Offset

The outline-offset property adds space between an outline and the edge or border of an element.

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

Note: Outline differs from borders! Unlike border, the outline is drawn outside the element's border, and may overlap other content. Also, the outline is NOT a part of the element's dimensions; the element's total width and height is not affected by the width of the outline.

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

Example

div.ex1 {
  margin: 20px;
  border: 1px solid black;
  outline: 4px solid red;
  outline-offset: 15px;
}

div.ex2 {
  margin: 10px;
  border: 1px solid black;
  outline: 5px dashed blue;
  outline-offset: 5px;
}
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CSS User Interface Properties

The following table lists all the user interface properties:

Property Description
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
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