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when animating variable font weights remember to include tighter optical sizing to maintain the width of the text

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166,982 views • 1 month ago •via X (Twitter)

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Seems like a good opportunity to share a trick I used on the React Aria website to make headings scale to fit the viewport on mobile, even with SSR. I used fontkit, a library I wrote 10 years ago to parse fonts and layout glyphs, to measure the width of the heading at build time in the "em" unit. width = font.layout('DateRangePicker').advanceWidth / font.unitsPerEm This is a size independent measurement using the font's internal metrics. When multiplied by any font size, you get the pixel width of the text. To calculate the font size, set this as a CSS variable and divide the target width (100vw minus padding). Clamp to make sure it doesn't get too big or small. font-size: clamp(35px, (100vw - 32px) / var(--text-width), 55px) And tada! You have perfectly scaling text no matter the viewport size. 🎉
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Seems like a good opportunity to share a trick I used on the React Aria website to make headings scale to fit the viewport on mobile, even with SSR. I used fontkit, a library I wrote 10 years ago to parse fonts and layout glyphs, to measure the width of the heading at build time in the "em" unit. width = font.layout('DateRangePicker').advanceWidth / font.unitsPerEm This is a size independent measurement using the font's internal metrics. When multiplied by any font size, you get the pixel width of the text. To calculate the font size, set this as a CSS variable and divide the target width (100vw minus padding). Clamp to make sure it doesn't get too big or small. font-size: clamp(35px, (100vw - 32px) / var(--text-width), 55px) And tada! You have perfectly scaling text no matter the viewport size. 🎉

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Zooming in to check the weight of the weights
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