Detailed explanation of font properties in CSS visual properties: font-family and font-size

CSS (Cascading Style Sheets) is a commonly used technology in web design. In CSS, visual properties are one of the key factors that control the appearance of a web page. This article will focus on font properties in CSS, including font-family and font-size, and provide specific code examples.

Fonts play a very important role in web design, which directly affects users’ reading and understanding of web content. In CSS, you can use the font-family attribute to specify the name of the font or the name of the font family to control the fonts used in web pages. The following is a code example:

p {
  font-family: Arial, sans-serif;
}

In the above example, we use the font-family attribute to specify that the font used in the paragraph (<p></p>) is Arial. If the Arial font cannot be found on the user's device, the fallback font sans-serif is used.

In addition to specifying specific font names, you can also control the display of fonts by specifying font family names. A font family name is a collection of fonts of a similar style. When the specified font is not available on the user's device, another font in the same family is automatically selected. Here is an example using the font family name:

h1, h2, h3 {
  font-family: "Helvetica Neue", Arial, sans-serif;
}

In this example, we use the font-family attribute to change the title element (<h1></h1>, <h2> </h2>, <h3></h3>) is set to "Helvetica Neue". If the font cannot be found, Arial will be selected, or sans-serif will be selected as the fallback font.

In addition to the name of the font and the name of the font family, the font properties can also specify the size of the font. In CSS, you can use the font-size property to control the size of the font. Here is a code example:

h1 {
  font-size: 36px;
}

In this example, we use the font-size attribute to set the font size in the title element (<h1></h1>) to 36 pixels. Of course, you can also use other units to specify the font size, such as em, rem, or percentage.

It should be noted that the choice of font size should take into account the user’s reading experience and design needs, and should not be too large or too small. Reasonable font size can improve the readability of text and create better visual effects in web pages.

To sum up, font-family and font-size are important font properties in CSS. Through the font-family attribute, we can control the font name or font family name used to ensure that web pages display consistent fonts on different devices. Through the font-size attribute, we can control the size of the font to adapt to different design needs and user reading experience.

I hope the code examples and explanations provided in this article can help readers better understand the usage and role of font attributes in CSS. By using these attributes appropriately, we can create more attractive, readable, and consistent web designs.

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