Catch Design, 9 April, 2019

Dynamic Typographic Systems &
Variable Fonts

Scalable, Fast, and Fabulous

Jason Pamental, web typographer

https://rwt.io | @jpamental
Itinerant typographer,
Walker of collies

An odyssey of sorts

a bit of backstory

The Odyssey, Book I

Tell me, O muse, of that ingenious hero who travelled far and wide after he had sacked the famous town of Troy. Many cities did he visit, and many were the nations with whose manners and customs he was acquainted; moreover he suffered much by sea while trying to save his own life and bring his men safely home; but do what he might he could not save his men, for they perished through their own sheer folly in eating the cattle of the Sun-god Hyperion; so the god prevented them from ever reaching home. Tell me, too, about all these things, O daughter of Jove, from whatsoever source you may know them.

Part 1: Typesetting
Part 2: Scaling
Part 3: Performance 

                h2 {
                  font-size: 1.75rem;
                }
                p {
                  font-size: 1rem;
                }
              
                @media (min-width: 55em) {
                  h2 {
                    font-size: 2.25rem;
                  }
                  p {
                    font-size: 1.25rem;
                  }
                }
[Font size proportion scaled]
[Fallback fonts, uncorrected]

                p {
                  font-family: Jost, Helvetica, sans-serif;
                  font-size: 1rem;
                  line-height: 1.5;
                }
                .wf-inactive p {
                  font-family: Jost, Helvetica, sans-serif;
                  font-size: 0.975rem;
                  line-height: 1.495;
                }
[Fallback fonts, corrected]
[Web fonts loaded]

A new chapter

A fourth episode, about three new things

The Odyssey, Book I

Tell me, O muse, of that ingenious hero who travelled far and wide after he had sacked the famous town of Troy. Many cities did he visit, and many were the nations with whose manners and customs he was acquainted; moreover he suffered much by sea while trying to save his own life and bring his men safely home; but do what he might he could not save his men, for they perished through their own sheer folly in eating the cattle of the Sun-god Hyperion; so the god prevented them from ever reaching home. Tell me, too, about all these things, O daughter of Jove, from whatsoever source you may know them. 


  .this-heading {
    --heading-color: #212171;
  }



  .this-heading.changed {
    --heading-color: #914141;
  }



  .this-heading {
    --heading-size: 5;
    font-size: calc( var(--heading-size) * 1vw );
  }



  .this-heading {
    --heading-size: 5;
    font-size: calc( var(--heading-size) * 1vw );
  }
  .this-heading.changed {
    --heading-size: 6;
  }



  .this-heading {
    --heading-weight: 700;
    --heading-width: 100;
    font-weight: var(--heading-weight);
    font-stretch: calc( var(--heading-width) * 1% );
  }



  .this-heading.thinner {
    --heading-weight: 150;
    --heading-width: 80;
  }

The Odyssey, Book I

Tell me, O muse, of that ingenious hero who travelled far and wide after he had sacked the famous town of Troy. Many cities did he visit, and many were the nations with whose manners and customs he was acquainted; moreover he suffered much by sea while trying to save his own life and bring his men safely home; but do what he might he could not save his men, for they perished through their own sheer folly in eating the cattle of the Sun-god Hyperion; so the god prevented them from ever reaching home. Tell me, too, about all these things, O daughter of Jove, from whatsoever source you may know them.

A little bit

Tell me, O muse, of that ingenious hero who travelled far and wide after he had sacked the famous town of Troy.

Can go farther

Many cities did he visit, and many were the nations with whose manners and customs he was acquainted

Than one expects

Moreover he suffered much by sea while trying to save his own life and bring his men safely home


  .small-card {
    --h3-size: 3;
    --p-size: 1.6;
  }



  .sidebar .small-card {
    --h3-size: 2.5;
    --p-size: 1.5;
  }

You might be asking

What was that strange magic in Slide 24?

A variable font is a single font file that behaves like multiple fonts

—John Hudson

a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
width
width
weight
weight
x-height
x-height

  .width.super-floof {
    font-stretch: 140%;
  }
  .width.petite-puffle {
    font-stretch: 50%;
  }


  .weight.chonky-boi {
    font-weight: 900;
  }
  .weight.skinny-minnie {
    font-weight: 500;
  }


  .x-height.bubba-bear {
    font-variation-settings: 'YTLC' 600;
  }
  .x-height.lil-bit {
    font-variation-settings: 'YTLC' 450;
  }
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Fonts/Variable_Fonts_Guide
slant

  .slant.naptime {
    font-style: oblique 12deg;
  }
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Fonts/Variable_Fonts_Guide

Scaling a scale


  :root {
    /* breakpoint variables */
    --bp-small: 25;
    --bp-medium: 45;
    --bp-large: 55;
    --bp-xlarge: 65;
  
    /* set scale values */
    --p-size-min: 1;
    --p-size-mid: 1.125;
    --p-size-max: 1.25;
    --p-lh-min: 1.2;
    --p-lh-mid: 1.4;
    --p-lh-max: 1.6;
  }
[Set font-size & line-height vars]

  p {
    font-size: calc( var(--p-size-min) * 1em );
    line-height: var(--p-lh-min);
  }
[Scale font-size & line-height]

  @media screen and (min-width: 25em) {
    p {
      line-height: calc(( var(--p-lh-min) * 1em ) + 
        ( var(--p-lh-max) - var(--p-lh-min) ) * 
        ((100vw - ( var(--bp-small) * 1em )) / 
        ( var(--bp-xlarge) - var(--bp-small) )));
      font-size: calc(( var(--p-size-min) * 1em ) + 
        ( var(--p-size-max) - var(--p-size-min) ) * 
        ((100vw - ( var(--bp-small) * 1em )) / 
        ( var(--bp-xlarge) - var(--bp-small) )));
    }
  }
  @media (min-width: 65em) {
    p {
      font-size: calc( var(--p-size-max) * 1em );
      line-height: var(--p-lh-max);
    }
  }

calc( [size-min]em + ( [size-max] - [size-min] ) * ((100vw - [start]em ) / ( [stop] - [start] )));

https://blog.typekit.com/2016/08/17/flexible-typography-with-css-locks/

“Please scale from 2.25em on small screens up to 5em on largest ones, starting at viewport width of 25em and stopping at 75em or larger”

https://blog.typekit.com/2016/08/17/flexible-typography-with-css-locks/

calc( 2.25em + ( 5 - 2.25 ) * ((100vw - 25em ) / ( 75 - 25 )));

https://blog.typekit.com/2016/08/17/flexible-typography-with-css-locks/

calc( 2.25em + ( 2.75 ) * ((100vw - 25em ) / ( 50 )));

https://blog.typekit.com/2016/08/17/flexible-typography-with-css-locks/

Putting it all together


  :root {
    /* breakpoint variables */
    --bp-small: 25;
    --bp-medium: 45;
    --bp-large: 55;
    --bp-xlarge: 65;
  
  /* initial variable font values */
    --text-wght: 375;
    --text-wdth: 95;
    --text-opsz: 16;
    --text-GRAD: 0;
    
    /* set scale values */
    --p-size-min: 1;
    --p-size-mid: 1.125;
    --p-size-max: 1.25;
    --p-lh-min: 1.2;
    --p-lh-mid: 1.4;
    --p-lh-max: 1.6;
    --p-wdth-min: 85;
    --p-wdth-mid: 92.5;
    --p-wdth-max: 100;
  }



  p {
    --text-wght: 400;
    --text-GRAD: -0.1;
    font-size: calc( var(--p-size-min) * 1em );
    font-stretch: calc( var(--p-wdth-min) * 1% );
    font-weight: var(--text-wght);
    font-variation-settings: 
      'opsz' var(--text-opsz), 
      'GRAD' var(--text-GRAD);
    line-height: var(--p-lh-min);
  }



  @media screen and (min-width: 25em) {
    p {
      line-height: calc(( var(--p-lh-min) * 1em ) + 
        ( var(--p-lh-max) - var(--p-lh-min) ) * 
        ((100vw - ( var(--bp-small) * 1em )) / 
        ( var(--bp-xlarge) - var(--bp-small) )));
      font-size: calc(( var(--p-size-min) * 1em ) + 
        ( var(--p-size-max) - var(--p-size-min) ) * 
        ((100vw - ( var(--bp-small) * 1em )) / 
        ( var(--bp-xlarge) - var(--bp-small) )));
    }
  }
  @media (min-width: 65em) {
    p {
      --text-opsz: 20;
      font-size: calc( var(--p-size-max) * 1em );
      font-stretch: calc( var(--p-wdth-max) * 1% );
      line-height: var(--p-lh-max);
    }
  }
https://codepen.io/jpamental/pen/MGEPEL 

  :root {
    /* default light mode colors */
    --color-bg: #f9f9fd;
    --color-text: #414141;
  
    /* initial variable font values */
    --text-GRAD: -0.1;
  }



  @media (prefers-color-scheme: dark) {
    --color-text: #f9f9fd;
    --color-bg: #414141;
    p {
      --text-GRAD: 0.25;
      letter-spacing: 0.015em;
    }
  }
https://css-tricks.com/dark-modes-with-css 

  :root {
    /* default light mode colors */
    --color-bg: #f9f9fd;
    --color-text: #414141;
  
    /* initial variable font values */
    --text-GRAD: -0.1;
  }



  .contrast {
    /* higher contrast colors */
    --color-bg: #fafafe;
    --color-text: #212121;
  }
  .contrast p {
    --text-GRAD: 0.75;
    letter-spacing: 0.005em;
  }



  .bigtext {
    --p-size-min: 1.25;
    --p-size-mid: 1.375;
    --p-size-max: 1.5;
  }



  .spacing {
    --p-lh-min: 2.2;
    --p-lh-mid: 2.4;
    --p-lh-max: 2.6;
  }
  .spacing p {
    word-spacing: 0.75em;
  }



.teaser {
  grid-column: auto / span 1;
  --p-lh-min: 1.1;
  --p-lh-mid: 1.2;
  --p-lh-max: 1.3;
}
@media (min-width: 67em) {
  .teaser {
    --p-size-min: 0.875;
    --p-size-mid: 0.875;
    --p-size-max: 1;
  }
}



:root {
  /* font stack */
  --font-stack: "Roboto Delta", sans-serif;
  --font-stack-serif: "Source Serif VF", serif;
}
.theme-alt {
  font-family: var(--font-stack-serif);  
}
.theme-alt p {
  --text-wght: 400;
}
@media screen and (min-width: 25em) {
  .theme-alt p {
    --text-wght: 375;
}
@media screen and (min-width: 45em) {
  .theme-alt p {
    --text-wght: 350;
  }
}
@media screen and (min-width: 55em) {
  .theme-alt p {
    --text-wght: 330;
  }
}
https://www.carbondesignsystem.com
IBM Plex Sans Variable
transform
16 files
960kb
into
2 files
233kb
!
https://github.com/IBM/plex/tree/master/IBM-Plex-Sans-Variable

Cast of Characters

FF Meta Variable

by Monotype

https://www.monotype.com/fonts/variable-fonts

Input Mono Variable

by DJR

https://djr.com (contact for info)

Jost* Variable

by indestrictible type*

https://github.com/indestructible-type/Jost (some assembly required)

Roboto Delta Variable

by Google & Type Network

https://github.com/TypeNetwork/Roboto-Delta (use v2)

Roslindale

by DJR

https://fontofthemonth.club

Roslindale Italic

by DJR

https://fontofthemonth.club

Source Serif Variable

by Adobe

https://github.com/adobe-fonts/source-serif-pro

Source Sans Variable

by Adobe

https://github.com/adobe-fonts/source-sans-pro

Proxima Nova Variable BETA

by Mark Simonson

https://www.marksimonson.com (tell him I sent ya!)

Amstelvar

by Type Network

https://github.com/TypeNetwork/Amstelvar

Plex Sans Variable

by IBM

https://github.com/IBM/plex/tree/master/IBM-Plex-Sans-Variable

Plex Sans Italic Variable

by IBM

https://github.com/IBM/plex/tree/master/IBM-Plex-Sans-Variable

thank you

Jason Pamental

  • https://rwt.io | @jpamental
  • https://rwt.io/newsletter
  • https://noti.st/jpamental/f59yBJ