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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCSS clamp() lets a font size grow with the viewport while keeping it inside a minimum and maximum. A common pattern pairs a viewport-relative preferred value with rem bounds:
h1 {
font-size: clamp(1.5rem, 4vw, 3rem);
}That rule is a starting point, not a universal preset: test it across the widths and text-zoom settings your page needs to support.
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How clamp() sets a fluid font size
The function takes three comma-separated values in this order: minimum, preferred, and maximum. The preferred value applies while it stays between the bounds. If it would be smaller than the minimum, the minimum wins; if it would be larger than the maximum, the maximum wins. MDN defines clamp() as a way to keep a value within a range set by minimum and maximum bounds (MDN’s clamp() reference).
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In clamp(1.5rem, 4vw, 3rem), 1.5rem is the floor, 4vw is the preferred size that changes with viewport width, and 3rem is the ceiling. The rem unit is relative to the root font size; vw is based on viewport width. MDN’s guide to CSS values and units explains these value types.
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MDN also shows font-size: clamp(1rem, 2.5vw, 2rem);. These examples illustrate the pattern, not values that automatically suit every typeface, layout, or reading context.
Choose bounds that suit your design
Set the minimum and maximum based on the text’s role and the layout it must fit. Then choose a preferred expression that makes the size change at a useful rate between those bounds. A larger viewport-relative value generally makes the text grow more quickly as the viewport widens, but the final result is still capped by the minimum and maximum.
- Check the smallest and largest viewport widths you intend to support.
- Inspect at intermediate widths too; the preferred value changes continuously between the bounds.
- Check that the resulting size works with the actual font, line length, and surrounding layout.
If the layout changes structurally at a particular width, or the font size should change abruptly at a breakpoint, use other responsive CSS alongside the fluid rule. MDN notes that its fluid-typography example can be expressed with clamp() in one line without media queries; that does not mean every responsive design can dispense with media queries.
Check text resizing and zoom
MDN’s accessibility guidance for text controlled with clamp() is to use a relative maximum that is no less than twice the relative minimum. Its example is clamp(1rem, 2.5vw, 2rem). MDN says this helps text scale to at least 200% when the page is zoomed. Treat that ratio as guidance for the font-size bounds, not as proof that the whole page is accessible.
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Test the rendered page with text resizing and browser zoom. Confirm that text can enlarge without being clipped, overlapped, or made unusable by fixed-height containers or other layout constraints. Evaluate the actual page rather than relying on the CSS values alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What clamp() does—and does not—replace
Compared with a font size changed only at explicit breakpoints, a viewport-relative preferred value gives a gradual change between the bounds. Breakpoint rules remain useful when the design needs a discrete change, such as a different layout at a particular width. You can combine both approaches: use clamp() for fluid sizing within a range and breakpoint rules for structural changes.
MDN marks clamp() as widely available and reports browser availability since July 2020. Browser support information can change, so check the current MDN compatibility details if support for a specific browser is central to your project. MDN links the function to the CSS Values and Units Module Level 4.
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