Discuss the different ways to set CSS font size

Font size setting in CSS is a very important style control method. This method allows us to control the text size in web pages to better adapt to different screen sizes. In this article, we will discuss the different methods and common usage scenarios of setting CSS font size.

1. Basic syntax of CSS font size

In CSS, the basic syntax of font size is "font-size:value", where "value" is a number, indicating pixels or other length units . Font sizes in pixels are most common because they are consistent across screens and browsers.

For example, in the following CSS rule, the font size is set to 16 pixels:

p {
    font-size: 16px;
}

In addition to pixels, CSS also supports other font size units, such as percentage, em, and rem. Using these units allows us to set the font size relative to other elements or based on a parent element. For example:

h1 {
    font-size: 200%; /* 使用百分比 */
}
 
h2 {
    font-size: 1.5em; /* 使用em */
}
 
p {
    font-size: 0.8rem; /* 使用rem */
}

2. Common CSS font size setting methods

1. Uniformly set the global font size

The most common font size setting is in the global style of the website Set the font size uniformly in the table. This ensures that it looks consistent throughout the entire site, and when changes need to be made, only one place has to be changed.

For example, the following CSS setting will set the global font size to 16 pixels:

body {
    font-size: 16px;
}

2. Dynamic adjustment of font size

Sometimes, we want users to be able to adjust freely text size to better suit their needs. At this time, you can use relative units such as em, rem or percentage to set the font size relative to the font size of other elements.

For example, the following CSS setting sets the text font size relative to the font size of the parent element:

p {
    font-size: 1em;
}
 
h1 {
    font-size: 2.5em;
}
 
h2 {
    font-size: 2em;
}

In this case, if the user increases or decreases the font size of the parent element, the text in the The font size will also increase or decrease accordingly.

3. Media Queries

Using media queries, we can set different font sizes according to different screen sizes and device types. This ensures that it displays better on mobile devices and that the font size is not too small or too large for large screens.

For example, the following CSS setting will set a smaller font size on screens smaller than 600 pixels:

@media (max-width: 600px) {
    body {
        font-size: 14px;
    }
}

This will ensure a better fit for the user's browsing experience on small screens.

3. Common misunderstandings about CSS font size settings

1. Use fixed values

When setting the font size, some people may use fixed values. This may result in inappropriate display on devices with low or high screen resolutions, so values ​​with relative units such as pixels, ems or rem should be used.

2. Ignore Mobile Devices

Text on a web page may be too large or too small without taking mobile devices into account. Therefore, devices of different sizes and screen resolutions should be considered when designing and testing.

3. Ignore accessibility requirements

When accessing the website, some users may need to increase the text size or use a larger screen. Therefore, you should ensure that your website's text is sufficiently readable when zoomed in or out.

Summary:

CSS font size setting is a very important technology in web design. By controlling font size, we can ensure that our website displays text appropriately across different screen sizes and devices. It is important to note that fixed font sizes should be avoided and website accessibility should be considered to ensure that all users can use it easily.

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