Introduction to outline in CSS
In CSS, the property outline is one of the features that can be used to highlight an element, making it better visible. The main difference between outline and border is that the outline is outside the box (box) model of an element's styling and does not affect the element's size. In contrast, border is part of the element's content and affects its size.
The outline property is usually used for highlighting elements and provides more emphasis on them. Unlike border, the specifications of outline cannot be defined in detail (such as only applying styling to the top or bottom) and can only be applied to the entire element.
Outline properties
The outline property typically consists of three main properties that define it: outline-style, outline-width, and outline-color. These properties specify the type, thickness, and color of the outline respectively.
Another feature of the outline is outline-offset, which creates space between the outline and the box model of the element, and can be used to create different visual effects. This feature allows the user to create little selections that are visually related to the actual component.
Example implementation
Here is an example implementation showing how to use the outline in CSS:
<style>
.my-element {
outline: 2px dashed red;
outline-offset: 5px;
}
</style>
<div class="my-element">
This is an element with an outline
</div>
Line by line explanation of the code
<style> The CSS section related to the visual design is specified.
.my-element This is the CSS class for the element that we want to apply the outline to, which is defined.
outline: 2px dashed red; Here, the outline is defined as a dashed line of 2 pixels in red color.
outline-offset: 5px; This creates a space of 5 pixels between the outline and the box model of the element.
</style> This indicates the end of the CSS definition.
<div class="my-element"> This is an HTML element defined to which the class
.my-element will be applied. The content inside
<div> is for displaying to the user.