What is the difference between line-height and height in CSS?

The difference between line-height and height in CSS requires specific code examples

In CSS, we often need to adjust the height and line spacing of text lines. In order to achieve this purpose, we often use the two attributes line-height and height. Although they look similar, they have different actions and effects. This article will compare the differences between line-height and height in detail, and provide specific code examples to deepen understanding.

1. line-height attribute:
   The line-height attribute specifies the line height of the element, that is, the height of the line box. It accepts different units (pixels, ems, percentages, etc.), as well as specific numerical values. It can be applied to both block-level elements and inline elements.

Let’s look at a simple code example:

p {
  line-height: 1.5;
  background-color: lightblue;
}

The above code will set the line height of all paragraph elements to 1.5 times.

The line-height attribute affects the vertical alignment of inline elements and block-level elements. For example, if an inline element has a line-height of 2, then it will be vertically centered relative to the baseline of its parent element.

2. Height attribute:
   The height attribute specifies the height of the element box, that is, the height of the element content. It also accepts different units as well as specific numerical values. However, the height attribute can only be applied to block-level elements.

The following is a case:

div {
  height: 200px;
  background-color: lightgreen;
}

The above code will set a fixed height of 200px for all div elements.

The height attribute determines the actual height of the element. It not only affects the visible part of the element's content, but also affects the element's padding and border. If the content height exceeds the height set by the height attribute, it will overflow and be displayed or hidden.

3. The difference between line-height and height:
4. Different application objects: line-height can be applied to inline elements and block-level elements, while height can only be applied to block-level elements .
5. Different scopes: line-height determines the height of the line box, and height determines the height of the element box.
6. Whether it affects content overflow: line-height will not affect whether the content overflows, but height will affect whether the content overflows or hides when the content exceeds the set height.
7. Whether it affects the vertical alignment of text: line-height will affect the vertical alignment of text, height will not.

To sum up, line-height and height have different functions and effects in CSS. When setting the text line height and element height, we need to use the corresponding attributes according to specific needs.

I hope that through the explanations and code examples in this article, you can better understand the difference between line-height and height, and their role in CSS. A deeper understanding of these properties will help you better master CSS layout and typography skills.

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