CSS font-stretch property is used to widen or narrow the text on a webpage. For example,
body {
    font-family: Arial, sans-serif;
}
p.normal {
    font-stretch: normal;
}
p.condensed {
    font-stretch: condensed;
}
Browser Output
Here, font-stretch: condensed narrows the width of characters. 
css-font-stretch-syntax CSS Font Stretch Syntax
The font-stretch property has the following syntax,
font-stretch: normal | semi-condensed | condensed | extra-condensed | ultra-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded  
The possible value for CSS font-stretch are shown in the following table:
| Font Style Values | Description | 
|---|---|
normal | 
default value for font-style, the font appears in normal width | 
semi-condensed  | 
font appears slightly narrower than normal | 
condensed | 
font appears narrower than semi-condensed | 
extra-condensed | 
font appears narrower than condensed | 
ultra-condensed | 
font appears narrower than extra-condensed | 
semi-expanded | 
font appears wider than normal | 
expanded | 
font appears wider than semi-expanded | 
extra-expanded | 
font appears wider than expanded | 
ultra-expanded | 
font appears wider than extra-expanded | 
percentage | 
value between 50% and 200% (inclusive)Negative values are not allowed.  | 
Example of font-stretch
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <link rel="stylesheet" href="style.css" />
        <title>Using font-stretch</title>
    </head>
    <body>
        <p class="ultra-condensed">Ultra-condensed text</p>
        <p class="extra-condensed">Extra-condensed text</p>
        <p class="condensed">Condensed text</p>
        <p class="semi-condensed">Semi-condensed text</p>
        <p class="normal">Normal text</p>
        <p class="semi-expanded">Semi-expanded text</p>
        <p class="expanded">Expanded text</p>
        <p class="extra-expanded">Extra-expanded text</p>
        <p class="ultra-expanded">Ultra-expanded text</p>
    </body>
</html>
body {
    font-family: Arial, Helvetica, sans-serif;
}
/* sets font-stretch to Ultra-condensed*/
p.ultra-condensed {
    font-stretch: ultra-condensed;
}
/* sets font-stretch to Extra-condensed*/
p.extra-condensed {
    font-stretch: extra-condensed;
}
/* sets font-stretch to Condensed */
p.condensed {
    font-stretch: condensed;
}
/* sets font-stretch to Semi-condensed  */
p.semi-condensed {
    font-stretch: semi-condensed;
}
/* sets font-stretch to Normal  */
p.normal {
    font-stretch: normal;
}
/* sets font-stretch to Semi-expanded */
p.semi-expanded {
    font-stretch: semi-expanded;
}
/* sets font-stretch to Expanded */
p.expanded {
    font-stretch: expanded;
}
/*sets font-stretch to Extra-expanded  */
p.extra-expanded {
    font-stretch: extra-expanded;
}
/* sets font-stretch to Ultra-expanded  */
p.ultra-expanded {
    font-stretch: ultra-expanded;
}
Browser Output
 
In the above example, the output shows the text with different widths based on the different font-stretch values.
Note: The font-stretch property will have no effect if the current font doesn't support the condensed and expanded faces.