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Responsive
Typography
Using Sass to Keep Things Legible
What Is 

Responsive Typography?
Web Typography
• Font faces
• Sizes & scale
• Line height & vertical rhythm
• Line length
Responsive Typography
• Changing values at breakpoints
• Base font size
• Scale interval
• Vertical Rhythm
Why Does

Responsive Typography

Matter?
How Do We Make

Responsive Typography

Easy?
to the Rescue!
Map for Storing Data
• Breakpoint widths
• Typography values
• Base font-size
• Scale
• Vertical Rhythm
Map
$rwd-typography: (
default: (
base-font-size: 16px,
vertical-rhythm: 1.414,
type-scale: 1.2,
min-width: null
),
);
Map
$rwd-typography: (
medium: (
base-font-size: 18px,
vertical-rhythm: 1.5,
type-scale: 1.414,
min-width: 480px
),
);
Map
$rwd-typography: (
large: (
base-font-size: 20px,
vertical-rhythm: 1.618,
type-scale: 1.5,
min-width: 960px
),
);
Map
$rwd-typography: (
xlarge: (
base-font-size: 24px,
vertical-rhythm: 1.618,
type-scale: 1.618,
min-width: 1300px
)
);
List for Storing Labels
• Generate multiple font-sizes on a
consistent scale
• Labels to assign those sizes to
List
$rwd-labels: (
p,
bq,
sh,
h,
hero
);
Loop through Labels
@each $label in $rwd-labels {
%#{$label} {
// loop through
breakpoints
}
}
Loop through Breakpoints
@each $bp, $data in $rwd-
typography {
// $bp = key
// $data = value: nested map
// font-size: ?;
// line-height: ?;
}
Get Font-Size
@function rwd-get-font-size($label, $bp) {
$base—font-size: map-get(map-get($rwd-
typography, $bp), base-font-size);
$type-scale: map-get(map-get($rwd-typography,
$bp), type-scale);
$return: $base-font-size;
@for $i from 1 to index($rwd-labels, $label) {
$return: $return * $type-scale;
}
@return $return;
}
Get Line-Height
@function rwd-get-font-size($label, $bp) {
// same as before, but new var - $font-size
$font-size: X;
  $vertical-rhythm: map-get(map-get($rwd-
typography, $bp), vertical-rhythm);
$vertical-rhythm: $base-font-size *
$vertical-rhythm;
$line-height: ceil($font-size / $vertical-
rhythm) * $vertical-rhythm / $font-size;
$return: join($font-size, $line-height);
@return $return;
}
Using the Values
$values: rwd-generate-font-
size($label, $bp);
font-size: nth($values, 1);
line-height: nth($values, 2);
Extending the Labels
body { @extend %p; }
blockquote { @extend %bq; }
h2 { @extend %sh; }
h1 { @extend %h1; }
.hero { @extend %hero; }
IRL
SassMeister Gist
James Steinbach
jamessteinbach.com
jdsteinbach@gmail.com
@jdsteinbach
/jdsteinbach
CLT Sass
cltsass.com
info@cltsass.com
@CLTSass

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Responsive Typography with Sass