HTML DOM fontSizeAdjust Property

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# HTML DOM fontSizeAdjust Property

Complete Style Object Reference

## Definition and Usage

The fontSizeAdjust property sets/adjusts the size of a text.

The ratio between the height of the font's lowercase letter "x" and the height of the "font-size" is called a font's aspect value.

If the aspect value is high, the font will be readable when it is set to a smaller size. For example: Verdana has an aspect value of 0.58 (means that when font size is 100px, its x-height is 58px). Times New Roman has an aspect value of 0.46. This means that Verdana is more readable at smaller sizes than Times New Roman.

The fontSizeAdjust property specifies an aspect value for a text that will preserve the x-height of the first-choice font.

## Syntax

    Object.style.fontSizeAdjust=none|number

## Possible Values

Value | Description
--- | ---
none | Do not preserve the first font's x-height if the font is unavailable
number | Defines the aspect value ratio for the font. The formula to use: font-size of first-choice font*(aspect value of first-choice font/aspect value of available font) = font-size to apply to available font Example: If 14px Verdana (aspect value of 0.58) was unavailable, but an available font had an aspect value of 0.46, the font-size of the substitute would be 14 * (0.58/0.46) = 17.65px

## Example

The following example adjusts the font size of a text:

    <html>
    <head>
    <script type="text/javascript">
    function adjustFontSize()
    {
    document.getElementById("p1").style.fontSizeAdjust="0.70";
    }
    </script>
    </head>
    <body>

    <p id="p1">This is an example paragraph</p>

    <input type="button" onclick="adjustFontSize()"
    value="Adjust font-size" />

    </body>
    </html>

## Try-It-Yourself Demos

fontSizeAdjust - Adjust the font size of a text

Complete Style Object Reference

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