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There is no single CSS declaration that guarantees one line at every width while keeping text readable and accessible. First identify what is changing: the text may be wrapping, the font may be changing after a web-font load, the font size may be fluid, or the layout may be resizing around it. Usually, let content wrap, use bounded fluid typography with clamp(), and reserve enough layout space. Use white-space: nowrap only for genuinely atomic labels with a safe overflow or expansion fallback.
Identify what is actually resizing
These symptoms look similar but require different fixes:
- A heading becomes two lines, making its element and a card taller.
- A fallback font is replaced by a web font, changing glyph widths, line breaks, and line height.
font-sizechanges at a media query or because it uses viewport units.- Flex or grid tracks change size because a child has intrinsic content dimensions.
nowrapor hidden overflow clips text instead of allowing it to reflow.- Browser zoom, operating-system scaling, or a larger default font changes the available space.
In DevTools, inspect the computed font-size, font-family, line-height, inline-size, white-space, and overflow-wrap. Check flex and grid sizing, whether the web font has finished loading, and the browser’s zoom level. Temporarily restore normal wrapping while diagnosing:
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.problem {
font-size: inherit;
white-space: normal;
overflow-wrap: anywhere;
}Responsive CSS normally reflows text when its available inline space changes; JavaScript is not required for ordinary wrapping. See MDN’s responsive design guidance.
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Default: allow text to wrap
Paragraphs, headings, article titles, labels, and user-generated content should normally be allowed to grow vertically:
.title {
white-space: normal;
overflow-wrap: break-word;
}
/* For URLs, hashes, and other unbroken tokens */
.identifier {
overflow-wrap: anywhere;
}overflow-wrap protects the container from unusually long tokens. It is different from white-space: nowrap, which forbids ordinary line breaks. Google’s current CSS guidance recommends wrapping long tokens rather than applying nowrap indiscriminately.
Constrain reading width instead of forcing a particular line break:
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max-inline-size: 70ch;
margin-inline: auto;
}
.heading {
max-inline-size: 20ch;
}ch is only an approximation because it depends on the font. A flexible block with a maximum measure can shrink on small screens and expand only up to a comfortable line length.
Use bounded fluid typography
If a heading should scale smoothly, put a lower and upper limit around the fluid value:
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:root {
font-size: 100%;
}
.hero-title {
font-size: clamp(2rem, 1rem + 5vw, 4rem);
line-height: 1.05;
}clamp(minimum, preferred, maximum) lets the preferred value respond to the viewport without allowing an unreadably small or enormous result. Prefer rem or em in the limits so user root-font-size preferences still matter. A bare value such as font-size: 2vw has no safety bounds and can also respond poorly to text-resizing settings. web.dev’s fluid-type guidance explains this accessibility limitation.
For a reusable component, container units can represent its actual available space:
.component {
container-type: inline-size;
}
.component__title {
font-size: clamp(1.5rem, 1rem + 2.5cqi, 3rem);
}
/* Use vw instead when container units are not appropriate */
/* font-size: clamp(1.5rem, 1rem + 2.5vw, 3rem); */Never use cqi or vw as the sole font-size value. A bounded size can still wrap at some widths; that is preferable to shrinking text until it becomes difficult to read.
Improve headline breaks with text-wrap
h1,
h2,
h3 {
text-wrap: balance;
}
p,
blockquote {
text-wrap: pretty;
}text-wrap: balance asks the browser to choose more even line lengths for short headings. It does not shrink the font, change the element’s width, or guarantee one line or exactly two lines. A balanced heading can therefore leave unused space inside a bordered or backgrounded box. Use it deliberately rather than globally; the Chrome explanation of text-wrap balancing documents these limits.
When nowrap is appropriate
A short icon-and-label button, badge, currency token, or status value may be an atomic unit that should not split:
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.button {
white-space: nowrap;
}Use this only when the component can grow, move to another layout, or provide a recovery path. A safer truncating variant is:
.single-line {
max-inline-size: 100%;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}Ellipsis is appropriate only when omitted text is nonessential or recoverable through a tooltip, an expanded state, a details view, or a complete accessible name. Do not hide user names, instructions, legal text, or essential navigation. Test translated labels: a phrase that fits in English may be much longer in another language.
Keep variable-height components stable
Do not give headings a fixed height. Let cards grow, or align only the parts that truly require alignment:
.card {
display: grid;
grid-template-rows: auto 1fr auto;
}
.card-title {
/* Reserve space only when the product accepts the trade-off */
min-block-size: 3lh;
}The lh unit can reserve roughly a chosen number of line boxes where supported, but a fixed minimum must not clip longer content. If a design absolutely requires a fixed visual area, line clamping can provide a controlled presentation:
.card-title {
display: -webkit-box;
-webkit-box-orient: vertical;
-webkit-line-clamp: 2;
overflow: hidden;
}Clamping is content loss. Supply an accessible expansion path and never use it for essential instructions.
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Use container queries for component-level decisions
A viewport breakpoint can be wrong when a card is narrow inside a wide desktop viewport. Container queries respond to the component’s actual parent:
.card-grid {
container-type: inline-size;
}
.card-title {
font-size: 1.25rem;
}
@container (min-width: 30rem) {
.card-title {
font-size: 1.75rem;
}
}Use a container query for discrete structural changes and clamp() for smooth scaling. Combining both is often effective. See Chrome’s container and style query documentation.
Prevent font-loading jumps
With font-display: swap, the fallback font can render first and then be replaced. Different glyph widths, ascent, descent, and line gap can alter wrapping and surrounding layout. Define a tuned fallback face:
@font-face {
font-family: "Site Fallback";
src: local("Arial");
size-adjust: 97%;
ascent-override: 90%;
descent-override: 22%;
line-gap-override: 0%;
}
body {
font-family: "Site Fallback", "Site Font", sans-serif;
}These numbers are examples, not universal values; calculate or tune them for the actual font pair. The relevant controls are size-adjust, ascent-override, descent-override, and line-gap-override. web.dev’s CLS guidance explains how metric matching can reduce, but not eliminate, font-related layout shift.
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Preload only fonts needed immediately above the fold, because preloading competes with other critical resources:
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<link rel="preload"
href="/fonts/site-font.woff2"
as="font"
type="font/woff2"
crossorigin>Test with the web font blocked and on a slow connection so you can see whether the fallback layout is viable.
Accessibility is the constraint, not an afterthought
Do not make text tiny, disable user resizing, or silently clip content just to preserve a one-line screenshot. WCAG’s practical requirement is that enlarged text remains usable and retains content and functionality; wrapping into more lines is acceptable. Review WCAG technique G179.
- Check a 320 CSS-pixel viewport and 400% page zoom where applicable.
- Check 200% text resizing and a larger browser default font size.
- Test long translations, names, URLs, and user-entered values.
- Test keyboard focus, screen-reader names, forced-colors, and high-contrast modes.
- Ensure truncated controls expose the complete value and an obvious way to discover it.
A fixed line count is inherently fragile because font metrics, weight, language, width, letter spacing, and user settings vary. If a headline must look a particular way, editorially shorten it or provide a responsive alternate rather than fitting it with aggressive JavaScript.
Decision table
| Goal | Preferred approach | Trade-off |
|---|---|---|
| Readable responsive text | clamp() with rem plus viewport or container units |
It may still wrap |
| Better headline shape | text-wrap: balance |
No fixed line count or font resizing |
| Protect against long tokens | overflow-wrap: anywhere |
Breaks can look unusual |
| Keep a short label intact | white-space: nowrap with a layout or overflow fallback |
Localization and zoom can cause overflow |
| Reduce font-swap movement | Metric overrides and deliberate font loading | Requires font-specific tuning |
| Adapt a component in different parents | Container queries | Requires container setup and testing |
Quick troubleshooting checklist
- Confirm whether computed
font-sizeactually changed. - Check the loaded font and weight before and after web-font loading.
- Measure the element’s inline size and inspect flex or grid constraints.
- Remove accidental
nowrap, fixed heights, andoverflow: hidden. - Add a sensible measure with
max-inline-size. - Use bounded
clamp()or a container query only if scaling is the real requirement. - Apply
balanceto short headings, not as a fitting algorithm. - Retest at narrow widths, 200% text size, 400% zoom, slow fonts, and long translations.
Reliable baseline
:root {
font-size: 100%;
}
.component {
container-type: inline-size;
}
.component__title {
max-inline-size: 25ch;
font-size: clamp(1.5rem, 1rem + 2.5cqi, 3rem);
line-height: 1.1;
text-wrap: balance;
overflow-wrap: break-word;
}
.component__body {
max-inline-size: 70ch;
font-size: 1rem;
line-height: 1.5;
text-wrap: pretty;
}
.component__button {
white-space: nowrap;
}This pattern accepts natural reflow, limits line length, scales within readable bounds, and reserves nowrap for the one element whose label is intentionally atomic. Adjust it to the content and test conditions rather than treating it as a magic declaration.
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