Opening Silos in Big Brilliant Corporations Part 2

by Frontend NE

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Ok, but why is this important?

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Reith

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Arial Gill Sans Georgia Curious Helvetica Verdana

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“So, you want to load a custom font?” The Engineers

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@font-face { font-family: "MySuperCoolFont"; src: url("/static/font.woff2"); } body { font-family: "MySuperCoolFont", Sans; }

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The End Engineer Product Owner

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Not quite…

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1. Caching

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src: url(“/gel/static/font.woff2"); src: url(“/gel/static/font.woff2"); src: url(“/news/static/font.woff2"); src: url(“/news/static/font.woff2"); src: url(“/sport/static/font.woff2"); src: url(“/sport/static/font.woff2"); src: url(“/iwonder/static/font.woff2"); src: url(“/iwonder/static/font.woff2"); src: url(“/cbbc/static/font.woff2"); src: url(“/cbbc/static/font.woff2"); src: url(“/weather/static/font.woff2"); src: url(“/weather/static/font.woff2"); src: url(“/music/static/font.woff2"); src: url(“/music/static/font.woff2"); src: url(“/cbeebies/static/font.woff2"); src: url(“/cbeebies/static/font.woff2"); src: url(“/earth/static/font.woff2"); src: url(“/earth/static/font.woff2"); src: url(“/food/static/font.woff2"); src: url(“/food/static/font.woff2");

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Reith Sans Reith Sans Reith Sans Reith Sans

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Reith Sans Reith Sans Reith Sans Reith Sans

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2. Weight

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Reith Sans Regular Reith Sans Medium Reith Sans Light Reith Sans Bold Reith Sans Extra Bold Reith Sans Regular Italic Reith Sans Medium Italic Reith Sans Light Italic Reith Sans Bold Italic Reith Sans Extra Bold Italic Reith Serif Regular Reith Serif Medium Reith Serif Light Reith Serif Bold Reith Serif Extra Bold Reith Serif Regular Italic Reith Serif Medium Italic Reith Serif Light Italic Reith Serif Bold Italic Reith Serif Extra Bold Italic

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20 Font Files at ~50KB each

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40 Font Files at ~50KB each

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2MB

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Other 20kB Images 1818kB HTML 53kB Stylesheets 90kB Scripts 459kB Fonts 113kB Video 819kB Average Bytes per Page Total: 3.4MB Source: httpdarchive.org

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Cache: Set Max Age to at least 1 year Compress: use WOFF and/or WOFF2. Only load what you need

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@font-face { font-family: "MySuperCoolFont"; src: url("/static/font.woff2"); } page.html style.css

My Super Cool Website

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@font-face { font-family: "MySuperCoolFont"; src: url("/static/font.woff2"); } .cool-font { font-family: "MySuperCoolFont", Sans; } page.html style.css

My Super Cool Website

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3. Performance

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FOIT Flash Of Invisible Text

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document stylesheet.css Readable Paint font.woff time Very Approximate Timeline Of Page Load Final Paint

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Flash Of Unstyled Text with Class

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FOUT with Class

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This is some text.

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This is some text

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This is some text.

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if (document.documentElement.className.indexOf('cool-font')!=-1) { var coolFont = new FontFaceObserver('MySuperCoolFont'); coolFont.load() .then(() =>{ document.documentElement.className += " cool-font-loaded"; }) .catch((e) =>{ console.log('Failed to load super cool font'); }) }

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Welcome to my super cool website

page.html style.css @font-face { font-family: "MySuperCoolFont"; src: url("/static/font.woff2"); } html { font-family: Arial, sans; } html.cool-font-loaded { font-family: “MySuperCoolFont", Arial, Sans; }

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Welcome to my super cool website

page.html @font-face { font-family: "MySuperCoolFont"; src: url("/static/font.woff2"); } html { font-family: Arial, sans; } html.cool-font-loaded { font-family: “MySuperCoolFont", Arial, Sans; } style.css

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document stylesheet.css Readable Paint font.woff time Very Approximate Timeline Of Page Load Final Paint

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4. Things we couldn’t use

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1. Cache 2. Weight 3. Performance 4. Things we couldn’t use Custom Web Fonts

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Working Across Silos

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Useful Links: •Google Web Font Optimisation •Zach Leat’s Comprehensive Guide To Font Loading Strategies •Blog about BBC Reith Font