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HTML

              
                <h1 class="title">Responsive Typography Mixins</h1>

<p class="para">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris congue consequat felis vitae volutpat. Cras vestibulum volutpat massa at ultricies. Donec hendrerit lacus vel turpis mollis sit amet volutpat leo pharetra. Cras eu tellus magna, nec sodales turpis. Nulla suscipit turpis ornare purus mollis ultricies. Cras congue cursus magna eu varius. Vivamus eget nulla justo. Ut eget magna diam, lobortis ultrices tortor. Fusce bibendum cursus quam, bibendum eleifend justo accumsan adipiscing. Nam vulputate lacus eu ligula commodo ornare. Morbi viverra, dolor vel lobortis sollicitudin, dolor purus tincidunt quam, ut porttitor arcu nibh sed est.</p>
              
            
!

CSS

              
                @import "compass/css3";

// Define your typography breakpoints
$breakpoints: (
  'large'  : ( max-width: 600px ),
  'medium' : ( max-width: 400px ),
  'small'  : ( max-width: 300px )
);

// Rem font sizing with px fallback
// Inspired by https://css-tricks.com/snippets/css/less-mixin-for-rem-font-sizing/
@mixin type-size($sizeValue: 1.6, $lineHeight: $sizeValue) {
  font-size: ($sizeValue * 10) + px;
  font-size: ($sizeValue / 1.6) + rem;
  line-height: ($lineHeight * 10) + px;
  line-height: ($lineHeight / 1.6) + rem;
}

// Responsive type mixin 
// $rate is the ammount by which the size and line-height should 
// decrease (negative values) or increase (positive values) with each breakpoint
@mixin scale-type-linear($fontSize, $lineHeight, $rate) {
  $ratio: $lineHeight/$fontSize;
  
  // Return the initial font size and line-height
  @include type-size($fontSize, $lineHeight);

  // Loop through every breakpoint and return font sizes and line-heights for each
  @each $name, $breakpoint in $breakpoints {
    $newFontSize: $fontSize - $rate;
    @media only screen and #{inspect(map-get($breakpoints, $name))} {
      @include type-size($newFontSize, $newFontSize*$ratio)
    }
    // Increment our $rate
    $rate: $rate + $rate;
  }
}

// Responsive Typography by Breakpoints Mixin
//
// $sizes is a variable argument that matches our $breakpoints map
@mixin responsive-type-breakpoints($fontSize, $lineHeight, $sizes...) {
  $ratio: $lineHeight/$fontSize;
  $i: 1;
  
  // Return the initial font size and line-height
  @include type-size($fontSize, $lineHeight);
  
  // Loop through the breakpoins in our map and return font sizes and line heights for each of them
  @each $name, $breakpoint in $breakpoints {
    // Only return values when the breakpoint ins't 0
    @if nth($sizes, $i) != 0 { 
      $newFontSize: nth($sizes, $i);
      @media only screen and #{inspect(map-get($breakpoints, $name))} {
        @include type-size($newFontSize, $newFontSize*$ratio)
      }
    }
    $i: $i + 1;
  }
}


// 
@mixin responsive-type-breakpoint($fontSize, $lineHeight, $breakpoint) {
  @if (#{inspect(map-get($breakpoints, $breakpoint))}) != 'null' {
    @media only screen and #{inspect(map-get($breakpoints, $breakpoint))} {
      @include type-size($fontSize, $lineHeight);
    }
  } @else {
    @media only screen and ($breakpoint) {
      @include type-size($fontSize, $lineHeight);
    }
  }
}

.para {
  //@include scale-type-linear(3, 3.6, .2);
  @include responsive-type-breakpoints(3, 3.6, 2.4, 2, 1.6);
  // @include responsive-type-breakpoints(3, 3.6, 2.4, 0, 1.6);
  // @include responsive-type-breakpoint(3, 3.6, 'small');
}

.para-2 {
  // @include responsive-type-breakpoint(3, 3.6, 'min-device-width: 800px');
}
              
            
!

JS

              
                
              
            
!
999px

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