A SASS function to emulate what font-size-adjust is meant to do. Until it is widely supported, we can use a combination of math and Modernizr to meet the needs. ¶ The value for $font-size-adjust-value in this function is not calculated in the same way as a value for font-size-adjust. In my real-world example, font-size-adjust: .465; would be the…

SASS font-size-adjust

/* Not widely supported, can't use this yet */
@mixin font-size-adjust {
    -webkit-font-size-adjust: 0.465; /* No support yet */
    font-size-adjust: 0.465; /* Firefox only */
}

/* Define these somewhere if you aren't already */
$font-size-adjust-value: 1.15; 
$base-font-size: 16px; 

/* Since we can't use the above, let's create our own way to do it. */
@mixin fontface-adjust( $pixel, $adjust-value: $font-size-adjust-value, $base-size:$base-font-size ) {

    /* Set a default that will do nothing, just in case */
    @if $adjust-value == none {
        $adjust-value: 1; 
    }
    /* Clear units to make the math easier. Plus, we return EMs anyway */
    $pixel: clear-units($pixel); 
    $base-size: clear-units($base-size); 
    
    /* Return the default font-size in ems – then, scale it up if fontface is supported (needs Modernizr) */
    font-size: #{$pixel / $base-size}em;
    .fontface & {
        font-size: #{$pixel*$adjust-value / $base-size}em;
    }
}

Full write up now online here: http://www.projectevolution.com/activity/compass-tricks-supporting-intention-font-size-adjust/