What are the CSS font units?

Css font units include px, %, em, rem, vw, vh, vmin, vmax, etc. Detailed introduction: 1. px, specifies the font size as a fixed pixel value; 2. %, specifies the font size ratio relative to the parent element; 3. em, specifies the font size of the parent element; 4. rem, relative to the root element ( html element); 5. vw, a percentage relative to the viewport width; 6. vh, a percentage relative to the viewport height; 7. vmin, a percentage relative to the smaller of the viewport width and the viewport height. etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In CSS, there are multiple units that can be used to define font size. Here are some commonly used CSS font units:

Pixels (px): Pixels are one of the most commonly used font units. Pixel units specify the font size as a fixed pixel value. For example, font-size: 16px; means the font size is 16 pixels.

Percent (%): The percentage unit specifies the font size ratio relative to the parent element. For example, font-size: 150%; means that the font size is 150% of the font size of the parent element.

em (em): The em unit is also the font size relative to the parent element. 1em is equal to the font size of the parent element. For example, font-size: 1.5em; means that the font size is 1.5 times the font size of the parent element.

rem (rem): The rem unit is the font size relative to the root element (html element). 1rem is equal to the root element font size. For example, font-size: 1.2rem; means that the font size is 1.2 times the font size of the root element.

vw (vw): The vw unit is a percentage relative to the viewport width. 1vw is equal to 1% of the viewport width. For example, font-size: 5vw; means the font size is 5% of the viewport width.

vh (vh): The vh unit is a percentage relative to the viewport height. 1vh is equal to 1% of the viewport height. For example, font-size: 10vh; means the font size is 10% of the viewport height.

vmin (vmin): The vmin unit is a percentage relative to the smaller of the viewport width and viewport height. 1vmin is equal to 1% of the smaller value. For example, font-size: 3vmin; means the font size is 3% of the smaller value.

vmax (vmax): The vmax unit is a percentage relative to the larger of the viewport width and viewport height. 1vmax is equal to 1% of the larger value. For example, font-size: 2vmax; means the font size is 2% of the larger value.

In addition to the above units, you can also use absolute units (such as inches, centimeters, millimeters, points, etc.) to define the font size. But in web development, relative units are more commonly used because they can adapt to different screen sizes and devices.

It should be noted that different browsers may interpret font units slightly differently. Therefore, when using font units, it is recommended to conduct compatibility testing to ensure consistent display in different browsers.

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