Guide to CSS image properties: outline and display

CSS image attribute guide: outline and display

CSS is an indispensable part of front-end development, and image attributes are also essential. In this article, we will focus on two important concepts about image properties: outline and display. This article will detail their definition, usage, and specific code examples.

1. outline attribute

Overview: The outline attribute is used to create an outline around the element without occupying layout space. It's a simple, fast and easy-to-use way to highlight elements.

Syntax:

outline: outline-style outline-width outline-color;

• outline-style: Optional values ​​include: none, solid, dotted, dashed, double, groove, ridge, inset, outset.
• outline-width: Optional values ​​include: thin, medium, thick or specific pixel values.
• outline-color: Optional values ​​include color keywords or specific color values.

Sample code:
If you want to add a 2 pixel wide red outline to a button:

button {
  outline: solid 2px red;
}

If you want to set the outline of an element to a dashed line, and Set the color to blue:

div {
  outline: dashed 1px blue;
}

2. display attribute

Overview: The display attribute is used to control the display behavior of the element. It determines the layout characteristics of elements on the page, such as whether they are displayed as block-level elements, whether they occupy space, etc.

Syntax:

display: display-value;

• display-value: Optional values ​​include: block, inline, inline-block, none, etc.

Sample code:
If you want to display a div element as a block-level element:

div {
  display: block;
}

If you want to display a span element as an inline block-level element:

span {
  display: inline-block;
}

If you want to hide an element and not occupy layout space:

p {
  display: none;
}

Summary:

• Theoutline attribute is used to create a very simple element outline to highlight the element .
• The display attribute is used to control the display behavior of the element. You can choose to display it as a block-level element, an inline element or an inline block-level element.
• Both of these attributes can be used to change the appearance and layout of images, making front-end development more flexible and creative.

In this article, we discuss the definition and usage of outline and display properties in detail and provide specific code examples. I hope this article can provide you with help and guidance when using these properties.

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